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Climate and Average Weather Year Round in Arches National Park Utah, United States

In Arches National Park, the summers are hot, dry, and mostly clear and the winters are short, very cold, snowy, and partly cloudy. Over the course of the year, the temperature typically varies from 20°F to 95°F and is rarely below 8°F or above 101°F.

Based on the tourism score, the best time of year to visit Arches National Park for warm-weather activities is from late May to mid September.

Climate in Arches National Park

very coldcoldcoolwarmhothotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow80%80%55%55%clearovercastprecipitation: 1.1 inprecipitation: 1.1 in0.3 in0.3 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 7.4tourism score: 7.40.00.0
Arches National Park weather by month. Click on each chart for more information.

The hot season lasts for 3.5 months, from May 29 to September 13, with an average daily high temperature above 84°F. The hottest month of the year in Arches National Park is July, with an average high of 95°F and low of 68°F.

The cold season lasts for 2.9 months, from November 22 to February 18, with an average daily high temperature below 50°F. The coldest month of the year in Arches National Park is January, with an average low of 21°F and high of 40°F.

Average High and Low Temperature in Arches National Park

Average High and Low Temperature in Arches National ParkhotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 438°FJan 438°FJul 795°FJul 795°F20°F20°F68°F68°FMay 2984°FMay 2984°FSep 1384°FSep 1384°FNov 2250°FNov 2250°FFeb 1850°FFeb 1850°F56°F56°F58°F58°F30°F30°F29°F29°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 40°F49°F60°F69°F79°F90°F95°F91°F82°F69°F53°F41°F
Temp. 29°F37°F47°F55°F65°F76°F82°F78°F69°F55°F41°F30°F
Low 21°F28°F36°F43°F52°F62°F68°F65°F57°F44°F32°F23°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in Arches National Park

Average Hourly Temperature in Arches National ParkJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingfreezingfreezingvery coldcoldcoldcoolcoolcomfortablewarmhotvery coldfreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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© OpenStreetMap contributors

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In Arches National Park, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Arches National Park begins around May 23 and lasts for 5.2 months, ending around October 31.

The clearest month of the year in Arches National Park is September, during which on average the sky is clear, mostly clear, or partly cloudy 79% of the time.

The cloudier part of the year begins around October 31 and lasts for 6.8 months, ending around May 23.

The cloudiest month of the year in Arches National Park is February, during which on average the sky is overcast or mostly cloudy 45% of the time.

Cloud Cover Categories in Arches National Park

Cloud Cover Categories in Arches National ParkclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 1880%Sep 1880%Mar 255%Mar 255%May 2367%May 2367%Oct 3168%Oct 3168%NowNowclearmostly clearovercastpartly cloudymostly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 41%45%43%39%34%23%27%27%21%27%36%40%
Clearer 59%55%57%61%66%77%73%73%79%73%64%60%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Arches National Park varies throughout the year.

The wetter season lasts 10 months, from July 8 to May 8, with a greater than 12% chance of a given day being a wet day. The month with the most wet days in Arches National Park is September, with an average of 5.1 days with at least 0.04 inches of precipitation.

The drier season lasts 2.0 months, from May 8 to July 8. The month with the fewest wet days in Arches National Park is June, with an average of 1.9 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Arches National Park is September, with an average of 5.1 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 18% on July 26.

Daily Chance of Precipitation in Arches National Park

Daily Chance of Precipitation in Arches National ParkwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 2618%Jul 2618%Jun 135%Jun 135%May 812%May 812%NowNowrainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 1.6d2.4d3.4d3.4d3.2d1.9d4.6d5.1d5.1d4.0d2.7d1.7d
Mixed 0.7d0.3d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.3d0.7d
Snow 0.5d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d0.5d
Any 2.8d3.0d3.5d3.4d3.2d1.9d4.6d5.1d5.1d4.0d3.0d2.8d

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Arches National Park experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.8 months, from March 1 to November 25, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Arches National Park is September, with an average rainfall of 1.0 inches.

The rainless period of the year lasts for 3.3 months, from November 25 to March 1. The month with the least rain in Arches National Park is June, with an average rainfall of 0.4 inches.

Average Monthly Rainfall in Arches National Park

Average Monthly Rainfall in Arches National ParkrainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 inOct 11.1 inOct 11.1 inDec 250.3 inDec 250.3 inApr 300.6 inApr 300.6 inJun 170.3 inJun 170.3 inMar 10.5 inMar 10.5 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 0.4″0.4″0.5″0.5″0.6″0.4″0.7″0.8″1.0″0.9″0.6″0.4″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Arches National Park experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 1.5 months, from December 6 to January 20, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Arches National Park is December, with an average snowfall of 1.4 inches.

The snowless period of the year lasts for 11 months, from January 20 to December 6. The least snow falls around July 29, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Arches National Park

Average Monthly Snowfall in Arches National ParksnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inDec 281.6 inDec 281.6 inJul 290.0 inJul 290.0 inJan 201.0 inJan 201.0 in
The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 1.2″0.4″0.1″0.0″0.0″0.0″0.0″0.0″0.0″0.0″0.3″1.4″

The length of the day in Arches National Park varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 27 minutes of daylight; the longest day is June 20, with 14 hours, 53 minutes of daylight.

Hours of Daylight and Twilight in Arches National Park

Hours of Daylight and Twilight in Arches National ParkJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1914 hr, 53 minJun 2014 hr, 53 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 27 minDec 219 hr, 27 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.8h10.8h12.0h13.3h14.3h14.8h14.5h13.6h12.4h11.1h10.1h9.5h

The earliest sunrise is at 5:52 AM on June 13, and the latest sunrise is 1 hour, 54 minutes later at 7:47 AM on November 2. The earliest sunset is at 4:56 PM on December 6, and the latest sunset is 3 hours, 51 minutes later at 8:47 PM on June 27.

Daylight saving time (DST) is observed in Arches National Park during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Arches National Park

Sunrise & Sunset with Twilight and Daylight Saving Time in Arches National ParkJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:52 AMJun 135:52 AM8:47 PMJun 278:47 PMJun 27Dec 64:56 PMDec 64:56 PM7:47 AMNov 27:47 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Arches National Park

Solar Elevation and Azimuth in Arches National ParkJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM0001010101020202030303040404050506060700001010102020202030304040505060702875NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases in Arches National Park

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level in Arches National Park, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels in Arches National Park

Humidity Comfort Levels in Arches National ParkJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 20%Feb 20%Aug 30%Aug 30%drydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Arches National Park experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.4 months, from February 22 to July 3, with average wind speeds of more than 7.5 miles per hour. The windiest month of the year in Arches National Park is April, with an average hourly wind speed of 8.7 miles per hour.

The calmer time of year lasts for 7.6 months, from July 3 to February 22. The calmest month of the year in Arches National Park is January, with an average hourly wind speed of 6.3 miles per hour.

Average Wind Speed in Arches National Park

Average Wind Speed in Arches National ParkwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphApr 108.8 mphApr 108.8 mphJan 76.1 mphJan 76.1 mphJul 37.5 mphJul 37.5 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 6.37.18.28.78.58.26.96.47.06.86.76.4

The predominant average hourly wind direction in Arches National Park is from the south throughout the year.

Wind Direction in Arches National Park

Wind Direction in Arches National ParkJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

To characterize how pleasant the weather is in Arches National Park throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Arches National Park for general outdoor tourist activities is from late May to mid September, with a peak score in the last week of August.

Tourism Score in Arches National Park

Tourism Score in Arches National Parkbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.47.40.00.07.37.3NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Arches National Park for hot-weather activities is from late June to mid August, with a peak score in the third week of July.

Beach/Pool Score in Arches National Park

Beach/Pool Score in Arches National Parkbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.86.80.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Arches National Park typically lasts for 6.5 months (201 days), from around April 11 to around October 28, rarely starting before March 19 or after May 1, and rarely ending before October 10 or after November 14.

Time Spent in Various Temperature Bands and the Growing Season in Arches National Park

Time Spent in Various Temperature Bands and the Growing Season in Arches National Parkgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 1150%Apr 1150%Oct 2850%Oct 2890%May 190%May 190%Oct 1090%Oct 1010%Mar 1910%Mar 1910%Nov 1410%Nov 140%Dec 160%Dec 16Jul 21100%Jul 21100%NowNowfreezingvery coldcoldcomfortablewarmhotcoolfrigid
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Arches National Park should appear around March 24, only rarely appearing before March 14 or after April 6.

Growing Degree Days in Arches National Park

Growing Degree Days in Arches National ParkJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°F4,000°F4,000°FMar 2488°FMar 2488°FJun 4900°FJun 4900°FJul 81,800°FJul 81,800°FDec 314,158°FDec 314,158°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 2.7 months, from May 5 to July 28, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest month of the year in Arches National Park is June, with an average of 8.5 kWh.

The darker period of the year lasts for 3.5 months, from October 31 to February 13, with an average daily incident shortwave energy per square meter below 3.8 kWh. The darkest month of the year in Arches National Park is December, with an average of 2.6 kWh.

Average Daily Incident Shortwave Solar Energy in Arches National Park

Average Daily Incident Shortwave Solar Energy in Arches National ParkbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 128.5 kWhJun 128.5 kWhDec 212.6 kWhDec 212.6 kWhMay 57.3 kWhMay 57.3 kWhJul 287.3 kWhJul 287.3 kWhOct 313.8 kWhOct 313.8 kWhFeb 133.8 kWhFeb 133.8 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 2.93.95.36.77.78.57.86.85.94.53.22.6

For the purposes of this report, the geographical coordinates of Arches National Park are 38.723 deg latitude, -109.586 deg longitude, and 0 ft elevation.

The topography within 2 miles of Arches National Park is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Arches National Park is covered by shrubs (100%), within 10 miles by shrubs (99%), and within 50 miles by shrubs (82%) and trees (10%).

This report illustrates the typical weather in Arches National Park, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used for this report can be found on the Moab page.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.