Saint Charles Weather in August
Average highs run from 85°F on August 1 to 82°F on August 31, and lows from 64°F to 58°F. Normal precipitation for the month is 3.90 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
- 84°F
- Average low
- 62°F
- Precipitation
- 3.90 in
- Record high
- 105°FAug 4, 1954
- Record low
- 38°FAug 20, 1950
- Chance of a freeze
- 0%
- Days of 90°F or more
- 4.7
- Daylight
- 14 h 21 min to 13 h 08 min
- Cloud cover
- 51%
- Humidity
- 70%
- Dew point
- 62°F
- Wind
- 8.1 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 | 85°F | 64°F | 101°F 1953 | 50°F 1898 | 27% | 0% |
| Aug 2 | 85°F | 64°F | 103°F 1947 | 49°F 2009 | 27% | 0% |
| Aug 3 | 85°F | 64°F | 103°F 1947 | 49°F 1974 | 27% | 0% |
| Aug 4 | 85°F | 64°F | 105°F 1954 | 42°F 1978 | 27% | 0% |
| Aug 5 | 85°F | 64°F | 102°F 1947 | 48°F 1978 | 27% | 0% |
| Aug 6 | 85°F | 63°F | 98°F 2018 | 47°F 2004 | 28% | 0% |
| Aug 7 | 85°F | 63°F | 98°F 1980 | 46°F 1989 | 28% | 0% |
| Aug 8 | 85°F | 63°F | 99°F 2012 | 44°F 1904 | 28% | 0% |
| Aug 9 | 85°F | 63°F | 102°F 1894 | 45°F 1972 | 28% | 0% |
| Aug 10 | 85°F | 63°F | 100°F 1947 | 48°F 2024 | 28% | 0% |
| Aug 11 | 85°F | 63°F | 100°F 1941 | 47°F 1902 | 28% | 0% |
| Aug 12 | 85°F | 63°F | 98°F 1947 | 44°F 2004 | 28% | 0% |
| Aug 13 | 85°F | 62°F | 98°F 1944 | 44°F 1964 | 28% | 0% |
| Aug 14 | 84°F | 62°F | 100°F 1988 | 49°F 2004 | 28% | 0% |
| Aug 15 | 84°F | 62°F | 103°F 1988 | 42°F 2004 | 28% | 0% |
| Aug 16 | 84°F | 62°F | 102°F 1937 | 50°F 2013 | 28% | 0% |
| Aug 17 | 84°F | 62°F | 102°F 1988 | 45°F 2012 | 28% | 0% |
| Aug 18 | 84°F | 62°F | 102°F 2003 | 42°F 2012 | 28% | 0% |
| Aug 19 | 84°F | 61°F | 101°F 2003 | 46°F 1981 | 28% | 0% |
| Aug 20 | 84°F | 61°F | 101°F 1947 | 38°F 1950 | 28% | 0% |
| Aug 21 | 84°F | 61°F | 100°F 2003 | 47°F 1981 | 28% | 0% |
| Aug 22 | 83°F | 61°F | 100°F 1948 | 49°F 1951 | 27% | 0% |
| Aug 23 | 83°F | 60°F | 101°F 1948 | 48°F 1904 | 27% | 0% |
| Aug 24 | 83°F | 60°F | 101°F 1947 | 44°F 1942 | 27% | 0% |
| Aug 25 | 83°F | 60°F | 101°F 2003 | 41°F 1958 | 27% | 0% |
| Aug 26 | 83°F | 60°F | 104°F 2003 | 45°F 2015 | 27% | 0% |
| Aug 27 | 83°F | 59°F | 103°F 2003 | 43°F 1971 | 27% | 0% |
| Aug 28 | 83°F | 59°F | 98°F 2013 | 42°F 1935 | 27% | 0% |
| Aug 29 | 82°F | 59°F | 98°F 1948 | 43°F 1946 | 27% | 0% |
| Aug 30 | 82°F | 59°F | 104°F 1947 | 47°F 1897 | 27% | 0% |
| Aug 31 | 82°F | 58°F | 102°F 2013 | 42°F 1967 | 27% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- August 1
- sunrise 6:11 AM, sunset 8:32 PM
- August 31
- sunrise 6:41 AM, sunset 7:49 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00134063 (Indianola 2W), public domain. Records: NOAA GHCN-Daily, station USC00136316, 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.