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April Weather in Phoenix Arizona, United States

Daily high temperatures increase by 8°F, from 82°F to 90°F, rarely falling below 71°F or exceeding 99°F.

Daily low temperatures increase by 8°F, from 57°F to 65°F, rarely falling below 50°F or exceeding 72°F.

For reference, on July 4, the hottest day of the year, temperatures in Phoenix typically range from 84°F to 107°F, while on December 27, the coldest day of the year, they range from 45°F to 65°F.

Average High and Low Temperature in April in Phoenix

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.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. The horizontal axis is the day, 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 April in Phoenix

Average Hourly Temperature in April in PhoenixApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMayNowNowcoldcoolcoolcomfortablewarmhotsweltering
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.

Ouargla, Algeria (6,361 miles away) is the far-away foreign place with temperatures most similar to Phoenix (view comparison).

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The month of April in Phoenix experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 27% to 22%.

The clearest day of the month is April 29, with clear, mostly clear, or partly cloudy conditions 79% of the time.

For reference, on February 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 38%, while on June 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 86%.

Cloud Cover Categories in April in Phoenix

Cloud Cover Categories in April in PhoenixApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 173%Apr 173%Apr 3078%Apr 3078%Apr 1175%Apr 1175%Apr 2176%Apr 2176%NowNowclearovercastmostly clearpartly 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.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Phoenix, the chance of a wet day over the course of April is gradually decreasing, starting the month at 7% and ending it at 3%.

For reference, the year's highest daily chance of a wet day is 19% on August 12, and its lowest chance is 1% on June 13.

Probability of Precipitation in April in Phoenix

Probability of Precipitation in April in PhoenixApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%1%1%2%2%3%3%4%4%5%5%6%6%7%7%8%8%9%9%10%10%11%11%12%12%MarMayApr 17%Apr 17%Apr 303%Apr 303%Apr 115%Apr 115%Apr 213%Apr 213%NowNowrain
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).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during April in Phoenix is gradually decreasing, starting the month at 0.5 inches, when it rarely exceeds 1.3 inches, and ending the month at 0.2 inches, when it rarely exceeds 0.5 inches.

Average Monthly Rainfall in April in Phoenix

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.

Over the course of April in Phoenix, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 56 minutes, implying an average daily increase of 1 minute, 57 seconds, and weekly increase of 13 minutes, 36 seconds.

The shortest day of the month is April 1, with 12 hours, 34 minutes of daylight and the longest day is April 30, with 13 hours, 31 minutes of daylight.

Hours of Daylight and Twilight in April in Phoenix

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.

The latest sunrise of the month in Phoenix is 6:15 AM on April 1 and the earliest sunrise is 35 minutes earlier at 5:40 AM on April 30.

The earliest sunset is 6:49 PM on April 1 and the latest sunset is 22 minutes later at 7:10 PM on April 30.

Daylight saving time is not observed in Phoenix during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:18 AM and sets 14 hours, 22 minutes later, at 7:41 PM, while on December 21, the shortest day of the year, it rises at 7:28 AM and sets 9 hours, 56 minutes later, at 5:24 PM.

Sunrise & Sunset with Twilight in April in Phoenix

Sunrise & Sunset with Twilight in April in PhoenixApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMarMay5:40 AM5:40 AMApr 307:10 PMApr 307:10 PM6:15 AM6:15 AMApr 16:49 PMApr 16:49 PM6:02 AM6:02 AMApr 116:56 PMApr 116:56 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of April. 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 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 April in Phoenix

Solar Elevation and Azimuth in April in PhoenixApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMay001010202020303040405050506060700001010202030303040405050606070NowNow
northeastsouthwest
Solar elevation and azimuth over the course of April 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 April 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in April in Phoenix

Moon Rise, Set & Phases in April in PhoenixApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMMarMayMar 102:01 AMMar 102:01 AMMar 2512:01 AMMar 2512:01 AMApr 811:22 AMApr 811:22 AMApr 234:50 PMApr 234:50 PMMay 78:23 PMMay 78:23 PMMay 236:54 AMMay 236:54 AM7:04 AM7:04 AM7:16 PM7:16 PM6:26 PM6:26 PM6:38 AM6:38 AM6:01 AM6:01 AM7:13 PM7:13 PM7:09 PM7:09 PM6:00 AM6:00 AM5:02 AM5:02 AM7:13 PM7:13 PM7:01 PM7:01 PM5:08 AM5:08 AM
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.
Apr 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
50%1:22 AMSE10:56 AMSW-6:09 AMS237,507 mi
2
45%2:18 AMSE12:01 PMWSW-7:10 AMS234,138 mi
3
34%3:07 AMESE1:12 PMWSW-8:09 AMS230,778 mi
4
23%3:49 AMESE2:24 PMWSW-9:07 AMS227,691 mi
5
13%4:26 AMESE3:37 PMWSW-10:01 AMS225,180 mi
6
6%4:59 AME4:49 PMW-10:53 AMS223,534 mi
7
1%5:30 AME6:00 PMW-11:43 AMS222,980 mi
8
0%6:01 AME7:13 PMWNW-12:34 PMS223,635 mi
9
2%6:33 AMENE8:25 PMWNW-1:26 PMS225,469 mi
10
6%7:09 AMENE9:38 PMWNW-2:20 PMS228,314 mi
11
14%7:50 AMENE10:50 PMWNW-3:17 PMS231,883 mi
12
22%8:38 AMENE11:56 PMNW-4:15 PMS235,830 mi
13
32%9:31 AMNE--5:13 PMS239,800 mi
14
43%-12:55 AMNW10:30 AMNE6:09 PMS243,480 mi
15
50%-1:44 AMWNW11:31 AMENE7:01 PMS246,631 mi
16
63%-2:26 AMWNW12:32 PMENE7:49 PMS249,101 mi
17
72%-3:00 AMWNW1:31 PMENE8:34 PMS250,819 mi
18
80%-3:30 AMWNW2:29 PMENE9:15 PMS251,782 mi
19
87%-3:56 AMWNW3:25 PME9:54 PMS252,039 mi
20
93%-4:20 AMW4:19 PME10:33 PMS251,674 mi
21
97%-4:43 AMW5:14 PME11:11 PMS250,792 mi
22
100%-5:07 AMW6:11 PMESE11:52 PMS249,495 mi
23
100%-5:32 AMWSW7:09 PMESE--
24
100%-6:00 AMWSW8:09 PMESE12:34 AMS247,878 mi
25
98%-6:32 AMWSW9:12 PMESE1:20 AMS246,014 mi
26
94%-7:10 AMWSW10:15 PMESE2:11 AMS243,957 mi
27
89%-7:56 AMSW11:16 PMSE3:05 AMS241,738 mi
28
81%-8:51 AMSW-4:04 AMS239,381 mi
29
71%12:13 AMSE9:53 AMWSW-5:03 AMS236,916 mi
30
61%1:04 AMESE11:00 AMWSW-6:02 AMS234,396 mi

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 chance that a given day will be muggy in Phoenix is essentially constant during April, remaining around 0% throughout.

For reference, on August 13, the muggiest day of the year, there are muggy conditions 24% of the time, while on November 3, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in April in Phoenix

Humidity Comfort Levels in April in PhoenixApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%MarMayApr 10%Apr 10%Apr 300%Apr 300%Apr 110%Apr 110%Apr 210%Apr 210%NowNowdrydry
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.

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 Phoenix is essentially constant during April, remaining within 0.2 miles per hour of 7.4 miles per hour throughout.

For reference, on April 29, the windiest day of the year, the daily average wind speed is 7.5 miles per hour, while on August 15, the calmest day of the year, the daily average wind speed is 5.7 miles per hour.

The highest daily average wind speed during April is 7.5 miles per hour on April 29.

Average Wind Speed in April in Phoenix

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Phoenix throughout April is predominantly from the west, with a peak proportion of 47% on April 30.

Wind Direction in April in Phoenix

Wind Direction in April in PhoenixApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%MarMayNowNowwestsoutheastnorth
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).

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).

Temperatures in Phoenix are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in April in Phoenix

Time Spent in Various Temperature Bands and the Growing Season in April in Phoenixgrowing seasonApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMay100%Apr 16100%Apr 16NowNowcoldcoolcomfortablewarmhotsweltering
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.

The average accumulated growing degree days in Phoenix are rapidly increasing during April, increasing by 652°F, from 991°F to 1,643°F, over the course of the month.

Growing Degree Days in April in Phoenix

The average growing degree days accumulated over the course of April, 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 in Phoenix is increasing during April, rising by 1.1 kWh, from 6.7 kWh to 7.8 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in April in Phoenix

Average Daily Incident Shortwave Solar Energy in April in PhoenixApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhMarMayApr 16.7 kWhApr 16.7 kWhApr 307.8 kWhApr 307.8 kWhApr 117.2 kWhApr 117.2 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.

For the purposes of this report, the geographical coordinates of Phoenix are 33.448 deg latitude, -112.074 deg longitude, and 1,083 ft elevation.

The topography within 2 miles of Phoenix is essentially flat, with a maximum elevation change of 56 feet and an average elevation above sea level of 1,082 feet. Within 10 miles is essentially flat (1,722 feet). Within 50 miles contains very significant variations in elevation (6,909 feet).

The area within 2 miles of Phoenix is covered by artificial surfaces (52%) and shrubs (48%), within 10 miles by artificial surfaces (51%) and shrubs (44%), and within 50 miles by shrubs (85%).

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

Temperature and Dew Point

There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Phoenix.

For each station, the records are corrected for the elevation difference between that station and Phoenix according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Phoenix is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Phoenix and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Phoenix and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

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.

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