Grant County Weather in September
Average highs run from 81°F on September 1 to 68°F on September 30, and lows from 54°F to 43°F. Normal precipitation for the month is 1.61 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
- 75°F
- Average low
- 49°F
- Precipitation
- 1.61 in
- Snowfall
- 0.2 in
- Record high
- 109°FSep 10, 1931
- Record low
- 15°FSep 25, 1926
- Chance of a freeze
- 24%
- Days of 90°F or more
- 2.4
- Daylight
- 13 h 07 min to 11 h 47 min
- Cloud cover
- 46%
- Humidity
- 54%
- Dew point
- 44°F
- Wind
- 11.4 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 | 81°F | 54°F | 105°F 1929 | 33°F 1965 | 24% | 0% |
| Sep 2 | 81°F | 54°F | 103°F 1929 | 37°F 1952 | 24% | 0% |
| Sep 3 | 80°F | 54°F | 102°F 1941 | 27°F 1974 | 24% | 0% |
| Sep 4 | 80°F | 53°F | 101°F 1946 | 37°F 1935 | 24% | 0% |
| Sep 5 | 80°F | 53°F | 106°F 1931 | 37°F 1968 | 25% | 0% |
| Sep 6 | 80°F | 53°F | 104°F 1931 | 35°F 1956 | 25% | 0% |
| Sep 7 | 79°F | 52°F | 105°F 2013 | 37°F 1929 | 25% | 0% |
| Sep 8 | 79°F | 52°F | 102°F 1931 | 37°F 1929 | 25% | 0% |
| Sep 9 | 78°F | 52°F | 106°F 1931 | 32°F 1976 | 25% | 0% |
| Sep 10 | 78°F | 51°F | 109°F 1931 | 27°F 1962 | 25% | 0% |
| Sep 11 | 78°F | 51°F | 101°F 1974 | 34°F 1962 | 25% | 0% |
| Sep 12 | 77°F | 51°F | 101°F 1931 | 35°F 1974 | 25% | 0% |
| Sep 13 | 77°F | 50°F | 100°F 1939 | 28°F 1974 | 25% | 0% |
| Sep 14 | 76°F | 50°F | 98°F 1939 | 32°F 1993 | 25% | 0% |
| Sep 15 | 76°F | 50°F | 98°F 1990 | 32°F 1947 | 25% | 0% |
| Sep 16 | 76°F | 49°F | 98°F 1990 | 35°F 1929 | 26% | 0% |
| Sep 17 | 75°F | 49°F | 96°F 1955 | 34°F 1965 | 26% | 0% |
| Sep 18 | 75°F | 48°F | 98°F 1943 | 35°F 1965 | 26% | 1% |
| Sep 19 | 74°F | 48°F | 98°F 1997 | 29°F 1927 | 26% | 1% |
| Sep 20 | 74°F | 48°F | 96°F 1937 | 27°F 1927 | 26% | 1% |
| Sep 21 | 73°F | 47°F | 95°F 1936 | 25°F 1983 | 26% | 1% |
| Sep 22 | 73°F | 47°F | 96°F 2005 | 29°F 1975 | 26% | 1% |
| Sep 23 | 72°F | 46°F | 95°F 1937 | 28°F 1975 | 26% | 1% |
| Sep 24 | 72°F | 46°F | 92°F 2007 | 25°F 1926 | 26% | 1% |
| Sep 25 | 71°F | 45°F | 97°F 1936 | 15°F 1926 | 26% | 1% |
| Sep 26 | 70°F | 45°F | 92°F 1967 | 24°F 1926 | 25% | 1% |
| Sep 27 | 70°F | 45°F | 95°F 1894 | 25°F 1928 | 25% | 1% |
| Sep 28 | 69°F | 44°F | 97°F 1921 | 19°F 1984 | 25% | 1% |
| Sep 29 | 69°F | 44°F | 93°F 2024 | 21°F 1985 | 25% | 1% |
| Sep 30 | 68°F | 43°F | 92°F 1994 | 23°F 1974 | 25% | 1% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:13 AM, sunset 7:20 PM
- September 30
- sunrise 6:43 AM, sunset 6:30 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094079 (Whitman 5 Ene), public domain. Records: NOAA GHCN-Daily, station USC00256200, 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.