Valley County Weather in September
Average highs run from 79°F on September 1 to 66°F on September 30, and lows from 52°F to 40°F. Normal precipitation for the month is 0.99 in over about 6 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
- 73°F
- Average low
- 46°F
- Precipitation
- 0.99 in
- Record high
- 106°FSep 7, 2022
- Record low
- 15°FSep 21, 1995
- Chance of a freeze
- 67%
- Days of 90°F or more
- 1.8
- Daylight
- 13 h 24 min to 11 h 42 min
- Cloud cover
- 55%
- Humidity
- 55%
- Dew point
- 39°F
- Wind
- 10.5 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 | 79°F | 52°F | 103°F 1983 | 39°F 1994 | 20% | 0% |
| Sep 2 | 79°F | 51°F | 98°F 1948 | 36°F 1962 | 20% | 0% |
| Sep 3 | 78°F | 51°F | 100°F 2022 | 32°F 1962 | 20% | 0% |
| Sep 4 | 78°F | 51°F | 100°F 1950 | 35°F 1956 | 20% | 0% |
| Sep 5 | 78°F | 50°F | 99°F 2022 | 33°F 1956 | 20% | 0% |
| Sep 6 | 77°F | 50°F | 97°F 1980 | 33°F 1992 | 20% | 0% |
| Sep 7 | 77°F | 49°F | 106°F 2022 | 34°F 1972 | 20% | |
| Sep 8 | 76°F | 49°F | 94°F 1998 | 30°F 2020 | 20% | |
| Sep 9 | 76°F | 49°F | 96°F 1998 | 27°F 1962 | 20% | |
| Sep 10 | 76°F | 48°F | 92°F 1948 | 23°F 1955 | 20% | |
| Sep 11 | 75°F | 48°F | 93°F 1971 | 26°F 1989 | 20% | |
| Sep 12 | 75°F | 47°F | 97°F 1958 | 26°F 1970 | 20% | |
| Sep 13 | 74°F | 47°F | 92°F 1948 | 21°F 1949 | 20% | |
| Sep 14 | 74°F | 47°F | 96°F 1955 | 31°F 2007 | 20% | |
| Sep 15 | 73°F | 46°F | 91°F 1998 | 31°F 1970 | 20% | |
| Sep 16 | 73°F | 46°F | 98°F 1998 | 29°F 1965 | 20% | |
| Sep 17 | 72°F | 45°F | 95°F 2009 | 27°F 1965 | 20% | |
| Sep 18 | 72°F | 45°F | 99°F 2021 | 22°F 1991 | 20% | |
| Sep 19 | 71°F | 45°F | 96°F 2009 | 28°F 1957 | 20% | |
| Sep 20 | 71°F | 44°F | 91°F 2008 | 20°F 1995 | 20% | |
| Sep 21 | 70°F | 44°F | 88°F 1948 | 15°F 1995 | 20% | |
| Sep 22 | 70°F | 43°F | 89°F 2021 | 27°F 1995 | 20% | |
| Sep 23 | 69°F | 43°F | 95°F 1992 | 26°F 1985 | 20% | |
| Sep 24 | 69°F | 42°F | 91°F 2011 | 26°F 2000 | 20% | |
| Sep 25 | 68°F | 42°F | 96°F 2024 | 28°F 1965 | 20% | |
| Sep 26 | 68°F | 42°F | 93°F 1952 | 27°F 1965 | 20% | |
| Sep 27 | 67°F | 41°F | 91°F 2021 | 24°F 1961 | 20% | |
| Sep 28 | 67°F | 41°F | 89°F 2010 | 23°F 1972 | 20% | |
| Sep 29 | 66°F | 40°F | 99°F 2024 | 24°F 1961 | 19% | |
| Sep 30 | 66°F | 40°F | 92°F 1963 | 20°F 1985 | 19% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:24 AM, sunset 7:48 PM
- September 30
- sunrise 7:05 AM, sunset 6:47 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094010 (St Marie), public domain. Records: NOAA GHCN-Daily, station USW00094008, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.