Cornell Weather in September
Average highs run from 74°F on September 1 to 64°F on September 30, and lows from 53°F to 42°F. Normal precipitation for the month is 3.67 in.
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
- 70°F
- Average low
- 48°F
- Precipitation
- 3.67 in
- Record high
- 93°FSep 8, 2003
- Record low
- 20°FSep 29, 2003
- Chance of a freeze
- 39%
- Daylight
- 13 h 15 min to 11 h 45 min
- Cloud cover
- 56%
- Humidity
- 74%
- Dew point
- 51°F
- Wind
- 9.8 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 | 74°F | 53°F | 88°F 2000 | 35°F 1987 | 0% | |
| Sep 2 | 74°F | 53°F | 87°F 2026 | 32°F 1994 | 0% | |
| Sep 3 | 74°F | 53°F | 88°F 1983 | 32°F 1994 | 0% | |
| Sep 4 | 74°F | 52°F | 91°F 2012 | 33°F 2001 | 0% | |
| Sep 5 | 73°F | 52°F | 91°F 2012 | 33°F 1993 | 0% | |
| Sep 6 | 73°F | 52°F | 88°F 1985 | 32°F 1993 | 0% | |
| Sep 7 | 73°F | 51°F | 88°F 1999 | 31°F 1986 | 0% | |
| Sep 8 | 72°F | 51°F | 93°F 2003 | 30°F 1995 | 0% | |
| Sep 9 | 72°F | 51°F | 90°F 2003 | 26°F 1993 | 0% | |
| Sep 10 | 72°F | 50°F | 88°F 2002 | 26°F 1993 | 0% | |
| Sep 11 | 71°F | 50°F | 85°F 2000 | 29°F 1993 | 0% | |
| Sep 12 | 71°F | 49°F | 91°F 2005 | 32°F 1989 | 0% | |
| Sep 13 | 71°F | 49°F | 84°F 2004 | 28°F 1986 | 0% | |
| Sep 14 | 70°F | 49°F | 90°F 1998 | 32°F 1987 | 0% | |
| Sep 15 | 70°F | 48°F | 83°F 2018 | 28°F 2007 | 0% | |
| Sep 16 | 70°F | 48°F | 87°F 2018 | 31°F 1986 | ||
| Sep 17 | 69°F | 48°F | 85°F 1988 | 28°F 2007 | ||
| Sep 18 | 69°F | 47°F | 85°F 1985 | 28°F 1993 | ||
| Sep 19 | 69°F | 47°F | 85°F 1985 | 27°F 1993 | ||
| Sep 20 | 68°F | 46°F | 82°F 2019 | 26°F 1991 | ||
| Sep 21 | 68°F | 46°F | 87°F 1998 | 24°F 1999 | ||
| Sep 22 | 67°F | 45°F | 86°F 2005 | 24°F 1999 | ||
| Sep 23 | 67°F | 45°F | 88°F 2017 | 27°F 1992 | ||
| Sep 24 | 67°F | 45°F | 86°F 2017 | 25°F 1983 | ||
| Sep 25 | 66°F | 44°F | 86°F 2017 | 25°F 1987 | ||
| Sep 26 | 66°F | 44°F | 81°F 1986 | 25°F 1987 | ||
| Sep 27 | 65°F | 43°F | 83°F 1987 | 25°F 1991 | ||
| Sep 28 | 65°F | 43°F | 83°F 2024 | 25°F 1991 | ||
| Sep 29 | 65°F | 43°F | 85°F 2024 | 20°F 2003 | ||
| Sep 30 | 64°F | 42°F | 84°F 2025 | 20°F 2003 |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 6:27 AM, sunset 7:42 PM
- September 30
- sunrise 7:02 AM, sunset 6:47 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00473698 (Holcombe), public domain. Records: NOAA GHCN-Daily, station USC00470773, 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.