Upper Alton Weather in September
Average highs run from 84°F on September 1 to 75°F on September 30, and lows from 65°F to 54°F. Normal precipitation for the month is 3.38 in over about 7 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 80°F
- Average low
- 60°F
- Precipitation
- 3.38 in
- Record high
- 103°FSep 4, 1954
- Record low
- 37°FSep 23, 1974
- Chance of a freeze
- 0%
- Days of 90°F or more
- 3.3
- Daylight
- 13 h 01 min to 11 h 49 min
- Cloud cover
- 46%
- Humidity
- 69%
- Dew point
- 56°F
- Wind
- 7.8 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 |
|---|---|---|---|---|---|---|
| Sep 1 | 84°F | 65°F | 101°F 1953 | 48°F 1955 | 22% | 0% |
| Sep 2 | 84°F | 64°F | 99°F 2026 | 46°F 1949 | 22% | 0% |
| Sep 3 | 84°F | 64°F | 99°F 2026 | 45°F 1974 | 22% | 0% |
| Sep 4 | 84°F | 64°F | 103°F 1954 | 43°F 1974 | 22% | 0% |
| Sep 5 | 83°F | 64°F | 103°F 1954 | 46°F 1974 | 22% | 0% |
| Sep 6 | 83°F | 63°F | 101°F 1954 | 50°F 1950 | 22% | 0% |
| Sep 7 | 83°F | 63°F | 99°F 1960 | 45°F 1956 | 22% | 0% |
| Sep 8 | 83°F | 63°F | 97°F 1960 | 42°F 1986 | 22% | 0% |
| Sep 9 | 82°F | 62°F | 98°F 1980 | 42°F 1986 | 22% | 0% |
| Sep 10 | 82°F | 62°F | 98°F 1964 | 48°F 1969 | 22% | 0% |
| Sep 11 | 82°F | 62°F | 97°F 2013 | 49°F 1959 | 22% | 0% |
| Sep 12 | 82°F | 61°F | 96°F 1952 | 42°F 1955 | 22% | 0% |
| Sep 13 | 81°F | 61°F | 95°F 1956 | 46°F 1953 | 22% | 0% |
| Sep 14 | 81°F | 61°F | 99°F 2025 | 44°F 1949 | 22% | 0% |
| Sep 15 | 81°F | 60°F | 97°F 1971 | 45°F 1974 | 22% | 0% |
| Sep 16 | 80°F | 60°F | 96°F 1954 | 46°F 1943 | 22% | 0% |
| Sep 17 | 80°F | 59°F | 96°F 1954 | 44°F 1981 | 22% | 0% |
| Sep 18 | 80°F | 59°F | 97°F 2026 | 43°F 1973 | 22% | 0% |
| Sep 19 | 79°F | 59°F | 94°F 1948 | 43°F 1973 | 22% | 0% |
| Sep 20 | 79°F | 58°F | 95°F 1978 | 42°F 1991 | 22% | 0% |
| Sep 21 | 79°F | 58°F | 95°F 2017 | 42°F 1982 | 22% | 0% |
| Sep 22 | 78°F | 58°F | 93°F 1956 | 39°F 1974 | 22% | 0% |
| Sep 23 | 78°F | 57°F | 96°F 2005 | 37°F 1974 | 22% | 0% |
| Sep 24 | 77°F | 57°F | 90°F 2007 | 38°F 1983 | 22% | 0% |
| Sep 25 | 77°F | 56°F | 88°F 1986 | 37°F 1950 | 22% | 0% |
| Sep 26 | 77°F | 56°F | 92°F 1946 | 41°F 1975 | 22% | 0% |
| Sep 27 | 76°F | 56°F | 89°F 1998 | 41°F 1975 | 22% | 0% |
| Sep 28 | 76°F | 55°F | 94°F 1953 | 37°F 1957 | 22% | 0% |
| Sep 29 | 75°F | 55°F | 100°F 1953 | 38°F 1949 | 22% | 0% |
| Sep 30 | 75°F | 54°F | 98°F 1952 | 37°F 1949 | 22% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 6:30 AM, sunset 7:31 PM
- September 30
- sunrise 6:56 AM, sunset 6:45 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00110137 (Alton - Melvin Price L&d), public domain. Records: NOAA GHCN-Daily, station USC00110137, 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.