Grant County Weather in September
Average highs run from 78°F on September 1 to 65°F on September 30, and lows from 51°F to 39°F.
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
- 72°F
- Average low
- 45°F
- Record high
- 106°FSep 6, 1978
- Record low
- 12°FSep 30, 1974
- Chance of a freeze
- 73%
- Days of 90°F or more
- 1.1
- Daylight
- 13 h 18 min to 11 h 44 min
- Cloud cover
- 53%
- Humidity
- 58%
- Dew point
- 44°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 | 78°F | 51°F | 94°F 1973 | 31°F 1994 | 0% | |
| Sep 2 | 77°F | 50°F | 99°F 2001 | 29°F 1974 | 0% | |
| Sep 3 | 77°F | 50°F | 102°F 1971 | 33°F 1974 | 0% | |
| Sep 4 | 77°F | 50°F | 102°F 1978 | 35°F 1974 | 0% | |
| Sep 5 | 76°F | 50°F | 105°F 1978 | 24°F 1965 | 0% | |
| Sep 6 | 76°F | 49°F | 106°F 1978 | 33°F 1968 | 0% | |
| Sep 7 | 76°F | 49°F | 104°F 1976 | 32°F 2004 | 0% | |
| Sep 8 | 75°F | 49°F | 98°F 1980 | 29°F 2020 | 0% | |
| Sep 9 | 75°F | 48°F | 94°F 1994 | 29°F 2020 | 0% | |
| Sep 10 | 75°F | 48°F | 98°F 1994 | 26°F 1965 | 0% | |
| Sep 11 | 74°F | 47°F | 95°F 1978 | 20°F 1964 | ||
| Sep 12 | 74°F | 47°F | 93°F 1976 | 25°F 1989 | ||
| Sep 13 | 73°F | 47°F | 97°F 2017 | 21°F 1970 | ||
| Sep 14 | 73°F | 46°F | 92°F 1969 | 19°F 1993 | ||
| Sep 15 | 73°F | 46°F | 92°F 1968 | 29°F 2007 | ||
| Sep 16 | 72°F | 46°F | 91°F 2002 | 29°F 1965 | ||
| Sep 17 | 72°F | 45°F | 97°F 2002 | 24°F 1993 | ||
| Sep 18 | 71°F | 45°F | 96°F 2000 | 25°F 1971 | ||
| Sep 19 | 71°F | 44°F | 92°F 2004 | 23°F 1991 | ||
| Sep 20 | 70°F | 44°F | 89°F 1972 | 22°F 1965 | ||
| Sep 21 | 70°F | 43°F | 84°F 2005 | 27°F 1972 | ||
| Sep 22 | 69°F | 43°F | 84°F 2015 | 20°F 1995 | ||
| Sep 23 | 69°F | 42°F | 90°F 2007 | 24°F 1989 | ||
| Sep 24 | 68°F | 42°F | 89°F 1992 | 21°F 1965 | ||
| Sep 25 | 68°F | 42°F | 89°F 1992 | 24°F 1965 | ||
| Sep 26 | 67°F | 41°F | 89°F 2014 | 15°F 1965 | ||
| Sep 27 | 67°F | 41°F | 99°F 1990 | 22°F 1967 | ||
| Sep 28 | 66°F | 40°F | 89°F 1989 | 20°F 1992 | ||
| Sep 29 | 65°F | 40°F | 88°F 1980 | 24°F 1992 | ||
| Sep 30 | 65°F | 39°F | 96°F 2024 | 12°F 1974 |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:07 AM, sunset 7:25 PM
- September 30
- sunrise 6:44 AM, sunset 6:28 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00321370 (Carson), public domain. Records: NOAA GHCN-Daily, station USC00324102, 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.