Mount Vernon Weather in August
Average highs run from 89°F on August 1 to 86°F on August 31, and lows from 72°F to 69°F. Normal precipitation for the month is 3.25 in over about 9 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
- 88°F
- Average low
- 71°F
- Precipitation
- 3.25 in
- Record high
- 105°FAug 17, 1997
- Record low
- 49°FAug 29, 1986
- Chance of a freeze
- 0%
- Days of 90°F or more
- 10.8
- Daylight
- 14 h 09 min to 13 h 03 min
- Cloud cover
- 53%
- Humidity
- 71%
- Dew point
- 65°F
- Wind
- 4.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Aug 1 | 89°F | 72°F | 100°F 2011 | 64°F 1966 | 31% | 0% |
| Aug 2 | 89°F | 72°F | 100°F 2002 | 62°F 1947 | 31% | 0% |
| Aug 3 | 89°F | 72°F | 101°F 2006 | 61°F 1959 | 31% | 0% |
| Aug 4 | 89°F | 72°F | 99°F 1987 | 63°F 1958 | 31% | 0% |
| Aug 5 | 89°F | 72°F | 98°F 2012 | 59°F 1951 | 31% | 0% |
| Aug 6 | 89°F | 72°F | 96°F 1955 | 56°F 1994 | 31% | 0% |
| Aug 7 | 89°F | 72°F | 97°F 2011 | 58°F 1994 | 31% | 0% |
| Aug 8 | 89°F | 72°F | 102°F 2007 | 58°F 1989 | 30% | 0% |
| Aug 9 | 89°F | 72°F | 97°F 1941 | 57°F 1989 | 30% | 0% |
| Aug 10 | 89°F | 72°F | 98°F 1943 | 60°F 1972 | 30% | 0% |
| Aug 11 | 89°F | 72°F | 100°F 1980 | 57°F 1972 | 30% | 0% |
| Aug 12 | 88°F | 72°F | 99°F 2016 | 59°F 1962 | 30% | 0% |
| Aug 13 | 88°F | 72°F | 101°F 2016 | 58°F 1941 | 30% | 0% |
| Aug 14 | 88°F | 71°F | 100°F 2016 | 55°F 1941 | 30% | 0% |
| Aug 15 | 88°F | 71°F | 103°F 1988 | 51°F 1963 | 29% | 0% |
| Aug 16 | 88°F | 71°F | 102°F 1997 | 57°F 1972 | 29% | 0% |
| Aug 17 | 88°F | 71°F | 105°F 1997 | 58°F 1941 | 29% | 0% |
| Aug 18 | 88°F | 71°F | 98°F 2002 | 58°F 1981 | 29% | 0% |
| Aug 19 | 88°F | 71°F | 98°F 2002 | 58°F 1953 | 28% | 0% |
| Aug 20 | 88°F | 71°F | 101°F 1983 | 56°F 1964 | 28% | 0% |
| Aug 21 | 87°F | 71°F | 96°F 1959 | 58°F 1949 | 28% | 0% |
| Aug 22 | 87°F | 71°F | 99°F 1983 | 55°F 1956 | 28% | 0% |
| Aug 23 | 87°F | 70°F | 97°F 1968 | 56°F 1952 | 28% | 0% |
| Aug 24 | 87°F | 70°F | 98°F 1968 | 54°F 1952 | 27% | 0% |
| Aug 25 | 87°F | 70°F | 97°F 1968 | 56°F 1942 | 27% | 0% |
| Aug 26 | 87°F | 70°F | 97°F 1948 | 53°F 1942 | 27% | 0% |
| Aug 27 | 86°F | 70°F | 100°F 1987 | 56°F 1944 | 27% | 0% |
| Aug 28 | 86°F | 70°F | 101°F 2024 | 54°F 1986 | 27% | 0% |
| Aug 29 | 86°F | 69°F | 98°F 1953 | 49°F 1986 | 27% | 0% |
| Aug 30 | 86°F | 69°F | 99°F 1953 | 50°F 1986 | 27% | 0% |
| Aug 31 | 86°F | 69°F | 100°F 1953 | 53°F 1946 | 27% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- August 1
- sunrise 6:10 AM, sunset 8:19 PM
- August 31
- sunrise 6:37 AM, sunset 7:40 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00013743 (Washington Reagan AP), public domain. Records: NOAA GHCN-Daily, station USW00013743, 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.