Grand Forks Air Force Base Weather in September
Average highs run from 76°F on September 1 to 63°F on September 30, and lows from 51°F to 40°F. Normal precipitation for the month is 2.26 in over about 9 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
- 70°F
- Average low
- 45°F
- Precipitation
- 2.26 in
- Record high
- 103°FSep 2, 1983
- Record low
- 18°FSep 28, 1942
- Chance of a freeze
- 66%
- Days of 90°F or more
- 0.9
- Daylight
- 13 h 22 min to 11 h 43 min
- Cloud cover
- 58%
- Humidity
- 65%
- Dew point
- 45°F
- Wind
- 11.2 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 | 76°F | 51°F | 98°F 1983 | 32°F 1974 | 29% | 0% |
| Sep 2 | 76°F | 50°F | 103°F 1983 | 34°F 1946 | 29% | 0% |
| Sep 3 | 76°F | 50°F | 96°F 1948 | 33°F 1974 | 29% | 0% |
| Sep 4 | 75°F | 50°F | 95°F 1978 | 33°F 1981 | 29% | 0% |
| Sep 5 | 75°F | 49°F | 101°F 1978 | 35°F 1984 | 29% | 0% |
| Sep 6 | 75°F | 49°F | 99°F 1976 | 31°F 1956 | 29% | 0% |
| Sep 7 | 74°F | 49°F | 96°F 1980 | 32°F 1979 | 29% | 0% |
| Sep 8 | 74°F | 48°F | 99°F 1959 | 30°F 1956 | 29% | 0% |
| Sep 9 | 73°F | 48°F | 91°F 1994 | 31°F 2020 | 29% | 0% |
| Sep 10 | 73°F | 48°F | 98°F 1952 | 30°F 1943 | 29% | 0% |
| Sep 11 | 73°F | 47°F | 95°F 1952 | 25°F 1955 | 29% | 0% |
| Sep 12 | 72°F | 47°F | 94°F 2017 | 33°F 2007 | 29% | 0% |
| Sep 13 | 72°F | 46°F | 87°F 1997 | 31°F 1986 | 29% | 0% |
| Sep 14 | 71°F | 46°F | 89°F 2006 | 25°F 1956 | 29% | 0% |
| Sep 15 | 71°F | 46°F | 86°F 2006 | 29°F 1949 | 28% | 0% |
| Sep 16 | 71°F | 45°F | 92°F 1979 | 25°F 1973 | 28% | 1% |
| Sep 17 | 70°F | 45°F | 92°F 1998 | 25°F 1959 | 28% | 1% |
| Sep 18 | 70°F | 45°F | 87°F 1989 | 32°F 2012 | 28% | 1% |
| Sep 19 | 69°F | 44°F | 91°F 1941 | 28°F 1942 | 28% | 1% |
| Sep 20 | 69°F | 44°F | 90°F 2019 | 26°F 1973 | 28% | 1% |
| Sep 21 | 68°F | 43°F | 91°F 2015 | 24°F 1974 | 28% | 1% |
| Sep 22 | 68°F | 43°F | 86°F 2020 | 20°F 1974 | 28% | 1% |
| Sep 23 | 67°F | 43°F | 93°F 2007 | 24°F 1989 | 28% | 1% |
| Sep 24 | 67°F | 42°F | 87°F 1997 | 25°F 1951 | 28% | 1% |
| Sep 25 | 66°F | 42°F | 87°F 2024 | 23°F 1985 | 28% | 1% |
| Sep 26 | 66°F | 41°F | 92°F 1974 | 20°F 1942 | 28% | 1% |
| Sep 27 | 65°F | 41°F | 95°F 1952 | 23°F 1942 | 28% | 1% |
| Sep 28 | 65°F | 40°F | 92°F 2021 | 18°F 1942 | 28% | 2% |
| Sep 29 | 64°F | 40°F | 89°F 2025 | 21°F 1945 | 28% | 2% |
| Sep 30 | 63°F | 40°F | 93°F 1976 | 23°F 1974 | 28% | 2% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 6:48 AM, sunset 8:10 PM
- September 30
- sunrise 7:28 AM, sunset 7:11 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00014916 (Grand Forks Intl AP), public domain. Records: NOAA GHCN-Daily, station USW00014916, 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.