Prosser Weather in August
Average highs run from 92°F on August 1 to 85°F on August 31, and lows from 61°F to 54°F. Normal precipitation for the month is 0.16 in over about 2 wet days.
August day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
August at a glance
- Average high
- 89°F
- Average low
- 58°F
- Precipitation
- 0.16 in
- Record high
- 108°FAug 10, 1898
- Record low
- 36°FAug 25, 1910
- Chance of a freeze
- 0%
- Days of 90°F or more
- 17.3
- Daylight
- 14 h 48 min to 13 h 20 min
- Cloud cover
- 31%
- Humidity
- 45%
- Dew point
- 48°F
- Wind
- 8.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Aug 1 | 92°F | 61°F | 106°F 1971 | 44°F 1902 | 5% |
| Aug 2 | 92°F | 61°F | 105°F 1965 | 43°F 1909 | 5% |
| Aug 3 | 92°F | 61°F | 103°F 2009 | 44°F 1903 | 5% |
| Aug 4 | 92°F | 60°F | 103°F 1961 | 44°F 1924 | 5% |
| Aug 5 | 92°F | 60°F | 104°F 1998 | 39°F 1909 | 5% |
| Aug 6 | 92°F | 60°F | 104°F 1990 | 39°F 1909 | 5% |
| Aug 7 | 92°F | 60°F | 103°F 1898 | 42°F 1909 | 5% |
| Aug 8 | 91°F | 60°F | 104°F 1898 | 42°F 1895 | 5% |
| Aug 9 | 91°F | 60°F | 103°F 1898 | 46°F 1919 | 5% |
| Aug 10 | 91°F | 59°F | 108°F 1898 | 45°F 1909 | 5% |
| Aug 11 | 91°F | 59°F | 104°F 1971 | 43°F 1899 | 5% |
| Aug 12 | 90°F | 59°F | 104°F 1971 | 41°F 1927 | 5% |
| Aug 13 | 90°F | 59°F | 103°F 1933 | 42°F 1955 | 5% |
| Aug 14 | 90°F | 58°F | 104°F 1920 | 40°F 1937 | 5% |
| Aug 15 | 90°F | 58°F | 104°F 1920 | 39°F 1910 | 5% |
| Aug 16 | 89°F | 58°F | 104°F 1923 | 39°F 1910 | 6% |
| Aug 17 | 89°F | 58°F | 106°F 1967 | 40°F 1895 | 6% |
| Aug 18 | 89°F | 57°F | 106°F 2008 | 39°F 1916 | 6% |
| Aug 19 | 89°F | 57°F | 105°F 1967 | 38°F 1910 | 6% |
| Aug 20 | 88°F | 57°F | 105°F 1897 | 39°F 1916 | 6% |
| Aug 21 | 88°F | 57°F | 105°F 1897 | 39°F 1910 | 6% |
| Aug 22 | 88°F | 56°F | 101°F 1897 | 37°F 1960 | 6% |
| Aug 23 | 88°F | 56°F | 103°F 1915 | 40°F 1910 | 6% |
| Aug 24 | 87°F | 56°F | 102°F 1915 | 38°F 1925 | 6% |
| Aug 25 | 87°F | 56°F | 102°F 1915 | 36°F 1910 | 6% |
| Aug 26 | 87°F | 55°F | 101°F 1916 | 36°F 1908 | 7% |
| Aug 27 | 86°F | 55°F | 101°F 1916 | 37°F 1910 | 7% |
| Aug 28 | 86°F | 55°F | 102°F 1916 | 38°F 1909 | 7% |
| Aug 29 | 86°F | 55°F | 103°F 1915 | 36°F 1925 | 7% |
| Aug 30 | 86°F | 54°F | 100°F 1967 | 36°F 1908 | 7% |
| Aug 31 | 85°F | 54°F | 102°F 1967 | 37°F 1908 | 7% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- August 1
- sunrise 5:41 AM, sunset 8:29 PM
- August 31
- sunrise 6:19 AM, sunset 7:39 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00456768 (Prosser), public domain. Records: NOAA GHCN-Daily, station USC00458207, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.