Potomac Weather in July
Average highs run from 85°F on July 1 to 84°F on July 31, and lows from 65°F to 64°F. Normal precipitation for the month is 4.59 in over about 9 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
- 85°F
- Average low
- 65°F
- Precipitation
- 4.59 in
- Record high
- 112°FJul 14, 1936
- Record low
- 41°FJul 23, 1947
- Chance of a freeze
- 0%
- Days of 90°F or more
- 6.7
- Daylight
- 15 h 00 min to 14 h 19 min
- Cloud cover
- 51%
- Humidity
- 77%
- Dew point
- 66°F
- Wind
- 7.6 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 | 85°F | 65°F | 100°F 1931 | 43°F 1937 | 32% | 0% |
| Jul 2 | 85°F | 65°F | 104°F 1925 | 45°F 1904 | 32% | 0% |
| Jul 3 | 85°F | 65°F | 103°F 1911 | 46°F 1924 | 32% | 0% |
| Jul 4 | 85°F | 65°F | 103°F 1911 | 44°F 1940 | 32% | 0% |
| Jul 5 | 85°F | 65°F | 104°F 1936 | 45°F 1972 | 32% | 0% |
| Jul 6 | 85°F | 65°F | 105°F 1936 | 46°F 1972 | 32% | 0% |
| Jul 7 | 85°F | 65°F | 107°F 1936 | 46°F 1942 | 32% | 0% |
| Jul 8 | 85°F | 65°F | 108°F 1936 | 46°F 1901 | 31% | 0% |
| Jul 9 | 85°F | 65°F | 103°F 1936 | 50°F 1918 | 31% | 0% |
| Jul 10 | 85°F | 65°F | 106°F 1936 | 44°F 1963 | 31% | 0% |
| Jul 11 | 85°F | 65°F | 111°F 1936 | 45°F 1898 | 31% | 0% |
| Jul 12 | 85°F | 65°F | 109°F 1936 | 50°F 1898 | 31% | 0% |
| Jul 13 | 85°F | 65°F | 109°F 1936 | 48°F 1940 | 31% | 0% |
| Jul 14 | 85°F | 65°F | 112°F 1936 | 45°F 1926 | 31% | 0% |
| Jul 15 | 85°F | 65°F | 110°F 1936 | 45°F 1930 | 30% | 0% |
| Jul 16 | 85°F | 65°F | 102°F 1936 | 46°F 1930 | 30% | 0% |
| Jul 17 | 85°F | 65°F | 102°F 1936 | 49°F 1940 | 30% | 0% |
| Jul 18 | 85°F | 65°F | 103°F 1954 | 46°F 1925 | 30% | 0% |
| Jul 19 | 85°F | 65°F | 101°F 1930 | 52°F 1984 | 30% | 0% |
| Jul 20 | 85°F | 65°F | 101°F 1934 | 47°F 1929 | 30% | 0% |
| Jul 21 | 85°F | 64°F | 106°F 1934 | 45°F 1944 | 29% | 0% |
| Jul 22 | 85°F | 64°F | 104°F 1901 | 49°F 1947 | 29% | 0% |
| Jul 23 | 85°F | 64°F | 108°F 1934 | 41°F 1947 | 29% | 0% |
| Jul 24 | 84°F | 64°F | 106°F 1934 | 50°F 1932 | 29% | 0% |
| Jul 25 | 84°F | 64°F | 110°F 1934 | 50°F 1904 | 29% | 0% |
| Jul 26 | 84°F | 64°F | 102°F 1936 | 47°F 1911 | 29% | 0% |
| Jul 27 | 84°F | 64°F | 103°F 1936 | 48°F 1911 | 28% | 0% |
| Jul 28 | 84°F | 64°F | 106°F 1916 | 49°F 2013 | 28% | 0% |
| Jul 29 | 84°F | 64°F | 104°F 1916 | 49°F 1925 | 28% | 0% |
| Jul 30 | 84°F | 64°F | 105°F 1913 | 51°F 1930 | 28% | 0% |
| Jul 31 | 84°F | 64°F | 101°F 1916 | 44°F 1895 | 28% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- July 1
- sunrise 5:25 AM, sunset 8:25 PM
- July 31
- sunrise 5:48 AM, sunset 8:07 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00114198 (Hoopeston), public domain. Records: NOAA GHCN-Daily, station USC00112140, 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.