St. Charles Weather in July
Average highs run from 85°F on July 1 to 85°F on July 31, and lows from 65°F to 66°F. Normal precipitation for the month is 4.57 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
- 85°F
- Average low
- 66°F
- Precipitation
- 4.57 in
- Record high
- 105°FJul 8, 2012
- Record low
- 43°FJul 1, 1988
- Chance of a freeze
- 0%
- Days of 90°F or more
- 7.1
- Daylight
- 14 h 49 min to 14 h 10 min
- Cloud cover
- 54%
- Humidity
- 69%
- Dew point
- 67°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 |
|---|---|---|---|---|---|---|
| Jul 1 | 85°F | 65°F | 99°F 1959 | 43°F 1988 | 33% | 0% |
| Jul 2 | 85°F | 65°F | 97°F 2012 | 45°F 1988 | 33% | 0% |
| Jul 3 | 85°F | 65°F | 96°F 1966 | 49°F 1957 | 33% | 0% |
| Jul 4 | 85°F | 65°F | 100°F 1966 | 48°F 1986 | 32% | 0% |
| Jul 5 | 86°F | 66°F | 101°F 2002 | 49°F 1963 | 32% | 0% |
| Jul 6 | 86°F | 66°F | 100°F 1999 | 46°F 1979 | 32% | 0% |
| Jul 7 | 86°F | 66°F | 102°F 2010 | 49°F 1979 | 32% | 0% |
| Jul 8 | 86°F | 66°F | 105°F 2012 | 49°F 1960 | 32% | 0% |
| Jul 9 | 86°F | 66°F | 101°F 2012 | 50°F 1984 | 32% | 0% |
| Jul 10 | 86°F | 66°F | 98°F 1999 | 48°F 1963 | 32% | 0% |
| Jul 11 | 86°F | 66°F | 100°F 1988 | 52°F 1962 | 32% | 0% |
| Jul 12 | 86°F | 66°F | 99°F 1988 | 51°F 2002 | 32% | 0% |
| Jul 13 | 86°F | 66°F | 95°F 1986 | 50°F 1978 | 32% | 0% |
| Jul 14 | 86°F | 66°F | 95°F 1966 | 55°F 1980 | 32% | 0% |
| Jul 15 | 86°F | 66°F | 96°F 1966 | 55°F 1971 | 32% | 0% |
| Jul 16 | 86°F | 66°F | 100°F 1988 | 51°F 1960 | 32% | 0% |
| Jul 17 | 86°F | 66°F | 102°F 1988 | 51°F 1960 | 32% | 0% |
| Jul 18 | 86°F | 66°F | 101°F 2012 | 52°F 1976 | 32% | 0% |
| Jul 19 | 85°F | 66°F | 102°F 2012 | 53°F 1957 | 32% | 0% |
| Jul 20 | 85°F | 66°F | 98°F 1999 | 57°F 1958 | 32% | 0% |
| Jul 21 | 85°F | 66°F | 99°F 1980 | 47°F 1966 | 32% | 0% |
| Jul 22 | 85°F | 66°F | 101°F 1987 | 48°F 1966 | 32% | 0% |
| Jul 23 | 85°F | 66°F | 102°F 2011 | 50°F 1977 | 33% | 0% |
| Jul 24 | 85°F | 66°F | 102°F 1991 | 51°F 1985 | 33% | 0% |
| Jul 25 | 85°F | 66°F | 99°F 2010 | 54°F 1957 | 33% | 0% |
| Jul 26 | 85°F | 66°F | 100°F 1987 | 48°F 1976 | 33% | 0% |
| Jul 27 | 85°F | 66°F | 99°F 2005 | 49°F 1962 | 33% | 0% |
| Jul 28 | 85°F | 66°F | 99°F 2005 | 49°F 1977 | 33% | 0% |
| Jul 29 | 85°F | 66°F | 96°F 1963 | 55°F 1977 | 33% | 0% |
| Jul 30 | 85°F | 66°F | 102°F 2011 | 52°F 2014 | 33% | 0% |
| Jul 31 | 85°F | 66°F | 99°F 1988 | 50°F 1966 | 33% | 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 8:36 PM
- July 31
- sunrise 6:09 AM, sunset 8:19 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00185865 (Mechanicsville 5 Ne), public domain. Records: NOAA GHCN-Daily, station USC00189070, 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.