Potomac Weather in July
Average highs run from 88°F on July 1 to 88°F on July 31, and lows from 67°F to 68°F. Normal precipitation for the month is 5.11 in over about 10 wet days.
July day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
July at a glance
- Average high
- 88°F
- Average low
- 68°F
- Precipitation
- 5.11 in
- Record high
- 105°FJul 31, 1954
- Record low
- 38°FJul 6, 1979
- Chance of a freeze
- 0%
- Days of 90°F or more
- 16.8
- Daylight
- 14 h 51 min to 14 h 12 min
- Cloud cover
- 55%
- Humidity
- 68%
- Dew point
- 65°F
- Wind
- 6.7 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 |
|---|---|---|---|---|---|---|
| Jul 1 | 88°F | 67°F | 100°F 1959 | 49°F 1919 | 33% | 0% |
| Jul 2 | 88°F | 67°F | 96°F 1956 | 46°F 1975 | 33% | 0% |
| Jul 3 | 88°F | 67°F | 99°F 1966 | 45°F 1918 | 33% | 0% |
| Jul 4 | 88°F | 67°F | 101°F 1966 | 43°F 1982 | 33% | 0% |
| Jul 5 | 88°F | 68°F | 99°F 1919 | 46°F 1979 | 33% | 0% |
| Jul 6 | 88°F | 68°F | 101°F 1999 | 38°F 1979 | 33% | 0% |
| Jul 7 | 88°F | 68°F | 100°F 1977 | 42°F 1979 | 33% | 0% |
| Jul 8 | 88°F | 68°F | 98°F 1993 | 45°F 1979 | 33% | 0% |
| Jul 9 | 88°F | 68°F | 99°F 2007 | 44°F 1918 | 33% | 0% |
| Jul 10 | 88°F | 68°F | 98°F 1993 | 48°F 1918 | 33% | 0% |
| Jul 11 | 89°F | 68°F | 97°F 1993 | 49°F 1918 | 33% | 0% |
| Jul 12 | 89°F | 68°F | 96°F 1984 | 48°F 1973 | 32% | 0% |
| Jul 13 | 89°F | 68°F | 95°F 1966 | 46°F 1978 | 32% | 0% |
| Jul 14 | 89°F | 68°F | 96°F 1966 | 50°F 1980 | 32% | 0% |
| Jul 15 | 89°F | 68°F | 99°F 1997 | 51°F 1981 | 32% | 0% |
| Jul 16 | 89°F | 68°F | 99°F 1988 | 53°F 1918 | 32% | 0% |
| Jul 17 | 88°F | 68°F | 98°F 1977 | 52°F 1974 | 32% | 0% |
| Jul 18 | 88°F | 68°F | 98°F 1986 | 55°F 1970 | 32% | 0% |
| Jul 19 | 88°F | 68°F | 98°F 1999 | 56°F 1909 | 32% | 0% |
| Jul 20 | 88°F | 68°F | 98°F 1987 | 48°F 1914 | 32% | 0% |
| Jul 21 | 88°F | 68°F | 100°F 1987 | 49°F 1971 | 32% | 0% |
| Jul 22 | 88°F | 68°F | 100°F 1957 | 49°F 1971 | 32% | 0% |
| Jul 23 | 88°F | 68°F | 100°F 1914 | 49°F 1977 | 32% | 0% |
| Jul 24 | 88°F | 68°F | 101°F 1914 | 50°F 1982 | 32% | 0% |
| Jul 25 | 88°F | 68°F | 98°F 1987 | 53°F 1915 | 32% | 0% |
| Jul 26 | 88°F | 68°F | 97°F 1987 | 46°F 1920 | 32% | 0% |
| Jul 27 | 88°F | 68°F | 99°F 1914 | 49°F 1975 | 32% | 0% |
| Jul 28 | 88°F | 68°F | 97°F 1954 | 46°F 1977 | 32% | 0% |
| Jul 29 | 88°F | 68°F | 99°F 1954 | 49°F 1978 | 32% | 0% |
| Jul 30 | 88°F | 68°F | 99°F 1954 | 49°F 1981 | 32% | 0% |
| Jul 31 | 88°F | 68°F | 105°F 1954 | 48°F 1981 | 32% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- July 1
- sunrise 5:47 AM, sunset 8:38 PM
- July 31
- sunrise 6:09 AM, sunset 8:21 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00182325 (Dalecarlia Rsvr), public domain. Records: NOAA GHCN-Daily, station USC00187705, 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.