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July Weather in Marietta Washington, United States

Daily high temperatures increase by 3°F, from 70°F to 73°F, rarely falling below 63°F or exceeding 81°F.

Daily low temperatures increase by 2°F, from 54°F to 57°F, rarely falling below 50°F or exceeding 61°F.

For reference, on July 31, the hottest day of the year, temperatures in Marietta typically range from 57°F to 73°F, while on December 31, the coldest day of the year, they range from 35°F to 44°F.

Average High and Low Temperature in July in Marietta

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 July. 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 July in Marietta

Average Hourly Temperature in July in MariettaJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJunAugcoldcoolcomfortablecold
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.

Rouen, France (4,876 miles away) is the far-away foreign place with temperatures most similar to Marietta (view comparison).

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The month of July in Marietta experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 41% to 27%.

The clearest day of the month is July 31, with clear, mostly clear, or partly cloudy conditions 73% of the time.

For reference, on January 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on August 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.

Cloud Cover Categories in July in Marietta

Cloud Cover Categories in July in MariettaJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugJul 159%Jul 159%Jul 3173%Jul 3173%Jul 1166%Jul 1166%Jul 2172%Jul 2172%clearmostly clearpartly cloudymostly cloudyovercast
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 Marietta, the chance of a wet day over the course of July is rapidly decreasing, starting the month at 16% and ending it at 9%.

For reference, the year's highest daily chance of a wet day is 58% on November 17, and its lowest chance is 9% on July 31.

Probability of Precipitation in July in Marietta

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 July in Marietta is gradually decreasing, starting the month at 1.2 inches, when it rarely exceeds 2.4 inches or falls below 0.2 inches, and ending the month at 0.8 inches, when it rarely exceeds 1.7 inches or falls below 0.1 inches.

The lowest average 31-day accumulation is 0.8 inches on July 30.

Average Monthly Rainfall in July in Marietta

Average Monthly Rainfall in July in MariettaJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 inJunAugJul 300.8 inJul 300.8 inJul 11.2 inJul 11.2 inJul 111.0 inJul 111.0 inJul 210.8 inJul 210.8 in
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 July in Marietta, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 0 minutes, implying an average daily decrease of 1 minute, 59 seconds, and weekly decrease of 13 minutes, 54 seconds.

The shortest day of the month is July 31, with 15 hours, 5 minutes of daylight and the longest day is July 1, with 16 hours, 5 minutes of daylight.

Hours of Daylight and Twilight in July in Marietta

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 earliest sunrise of the month in Marietta is 5:11 AM on July 1 and the latest sunrise is 32 minutes later at 5:43 AM on July 31.

The latest sunset is 9:16 PM on July 1 and the earliest sunset is 28 minutes earlier at 8:48 PM on July 31.

Daylight saving time is observed in Marietta during 2024, but it neither starts nor ends during July, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:06 AM and sets 16 hours, 10 minutes later, at 9:17 PM, while on December 21, the shortest day of the year, it rises at 8:01 AM and sets 8 hours, 15 minutes later, at 4:16 PM.

Sunrise & Sunset with Twilight in July in Marietta

The solar day over the course of July. 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 July in Marietta

Solar Elevation and Azimuth in July in MariettaJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJunAug001010202020303040405050506000010102020303030404050506060
northeastsouthwest
Solar elevation and azimuth over the course of July 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 July 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 July in Marietta

Moon Rise, Set & Phases in July in MariettaJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJunAugJun 65:38 AMJun 65:38 AMJun 216:09 PMJun 216:09 PMJul 53:58 PMJul 53:58 PMJul 213:18 AMJul 213:18 AMAug 44:14 AMAug 44:14 AMAug 1911:26 AMAug 1911:26 AM4:41 AM4:41 AM10:17 PM10:17 PM9:53 PM9:53 PM5:07 AM5:07 AM4:19 AM4:19 AM9:54 PM9:54 PM9:20 PM9:20 PM5:19 AM5:19 AM5:41 AM5:41 AM9:19 PM9:19 PM8:18 PM8:18 PM5:44 AM5:44 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.
Jul 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
21%1:39 AMENE5:24 PMWNW-9:24 AMS232,333 mi
2
12%2:04 AMNE6:46 PMNW-10:18 AMS233,852 mi
3
6%2:37 AMNE8:02 PMNW-11:14 AMS235,693 mi
4
2%3:21 AMNE9:05 PMNW-12:13 PMS237,834 mi
5
0%4:19 AMNE9:54 PMNW-1:10 PMS240,207 mi
6
1%5:28 AMNE10:30 PMNW-2:05 PMS242,700 mi
7
4%6:42 AMNE10:55 PMWNW-2:55 PMS245,161 mi
8
9%7:57 AMENE11:15 PMWNW-3:42 PMS247,414 mi
9
16%9:09 AMENE11:30 PMWNW-4:24 PMS249,282 mi
10
24%10:18 AMENE11:43 PMW-5:04 PMS250,598 mi
11
32%11:25 AME11:55 PMW-5:43 PMS251,223 mi
12
42%12:32 PME--6:21 PMS251,062 mi
13
50%-12:08 AMW1:39 PMESE7:01 PMS250,076 mi
14
61%-12:21 AMWSW2:48 PMESE7:43 PMS248,287 mi
15
71%-12:37 AMWSW4:00 PMESE8:28 PMS245,787 mi
16
80%-12:56 AMWSW5:14 PMSE9:19 PMS242,735 mi
17
88%-1:23 AMSW6:29 PMSE10:14 PMS239,355 mi
18
94%-1:59 AMSW7:38 PMSE11:14 PMS235,918 mi
19
97%-2:51 AMSW8:36 PMSE--
20
98%-3:58 AMSW9:20 PMSE12:17 AMS232,721 mi
21
100%-5:19 AMSW9:53 PMSE1:19 AMS230,042 mi
22
99%-6:46 AMWSW10:17 PMESE2:19 AMS228,096 mi
23
95%-8:14 AMWSW10:37 PMESE3:15 AMS227,001 mi
24
88%-9:39 AMW10:53 PME4:06 AMS226,766 mi
25
79%-11:03 AMW11:09 PME4:55 AMS227,310 mi
26
68%-12:26 PMW11:25 PMENE5:43 AMS228,492 mi
27
50%-1:49 PMWNW11:44 PMENE6:31 AMS230,144 mi
28
45%-3:12 PMWNW-7:21 AMS232,106 mi
29
33%12:07 AMNE4:34 PMNW-8:14 AMS234,249 mi
30
23%12:36 AMNE5:52 PMNW-9:09 AMS236,480 mi
31
14%1:17 AMNE6:59 PMNW-10:06 AMS238,739 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 Marietta is essentially constant during July, remaining around 0% throughout.

For reference, on August 2, the muggiest day of the year, there are muggy conditions 1% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in July in Marietta

Humidity Comfort Levels in July in MariettaJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JunAugJul 10%Jul 10%Jul 311%Jul 311%Jul 110%Jul 110%Jul 210%Jul 210%comfortablecomfortabledrydryhumidhumid
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 Marietta is essentially constant during July, remaining within 0.2 miles per hour of 3.1 miles per hour throughout.

For reference, on December 3, the windiest day of the year, the daily average wind speed is 6.3 miles per hour, while on August 8, the calmest day of the year, the daily average wind speed is 2.9 miles per hour.

Average Wind Speed in July in Marietta

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 Marietta throughout July is predominantly from the west, with a peak proportion of 48% on July 19.

Wind Direction in July in Marietta

Wind Direction in July in MariettaJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JunAugwestsouthnortheast
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).

Marietta is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Marietta is essentially constant during July, remaining within 1°F of 57°F throughout.

Average Water Temperature in July in Marietta

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 Marietta typically lasts for 7.5 months (231 days), from around March 21 to around November 6, rarely starting before February 18 or after April 17, and rarely ending before October 16 or after November 29.

The month of July in Marietta is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in July in Marietta

Time Spent in Various Temperature Bands and the Growing Season in July in Mariettagrowing seasongrowing seasongrowing seasonJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAug100%Jul 16100%Jul 16coldcoolcomfortablewarm
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 Marietta are increasing during July, increasing by 387°F, from 566°F to 952°F, over the course of the month.

Growing Degree Days in July in Marietta

The average growing degree days accumulated over the course of July, 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 Marietta is essentially constant during July, remaining within 0.1 kWh of 6.5 kWh throughout.

The highest average daily incident shortwave solar energy during July is 6.7 kWh on July 20.

Average Daily Incident Shortwave Solar Energy in July in Marietta

Average Daily Incident Shortwave Solar Energy in July in MariettaJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJunAugJul 206.7 kWhJul 206.7 kWhJul 16.5 kWhJul 16.5 kWhJul 316.4 kWhJul 316.4 kWh
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 Marietta are 48.787 deg latitude, -122.580 deg longitude, and 7 ft elevation.

The topography within 2 miles of Marietta contains only modest variations in elevation, with a maximum elevation change of 240 feet and an average elevation above sea level of 39 feet. Within 10 miles contains only modest variations in elevation (1,850 feet). Within 50 miles contains very significant variations in elevation (10,771 feet).

The area within 2 miles of Marietta is covered by cropland (43%), trees (30%), and herbaceous vegetation (16%), within 10 miles by water (34%) and cropland (33%), and within 50 miles by trees (38%) and water (33%).

This report illustrates the typical weather in Marietta, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Marietta.

For each station, the records are corrected for the elevation difference between that station and Marietta 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 Marietta is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Marietta 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 Marietta 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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