Beaverhead County Weather in September
Average highs run from 75°F on September 1 to 62°F on September 30, and lows from 38°F to 31°F. Normal precipitation for the month is 0.85 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
- 69°F
- Average low
- 35°F
- Precipitation
- 0.85 in
- Record high
- 97°FSep 3, 2022
- Record low
- 10°FSep 20, 1983
- Chance of a freeze
- 100%
- Daylight
- 13 h 15 min to 11 h 45 min
- Cloud cover
- 48%
- Humidity
- 54%
- Dew point
- 30°F
- Wind
- 5.8 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 | 75°F | 38°F | 92°F 1950 | 32°F 2006 | 19% | 0% |
| Sep 2 | 74°F | 38°F | 93°F 1950 | 25°F 1974 | 19% | 0% |
| Sep 3 | 74°F | 38°F | 97°F 2022 | 30°F 1958 | 19% | 0% |
| Sep 4 | 74°F | 38°F | 92°F 1950 | 32°F 1951 | 19% | 0% |
| Sep 5 | 73°F | 37°F | 92°F 1976 | 27°F 1956 | 19% | 0% |
| Sep 6 | 73°F | 37°F | 93°F 2022 | 29°F 1948 | 19% | 0% |
| Sep 7 | 73°F | 37°F | 91°F 2022 | 30°F 1962 | 19% | 0% |
| Sep 8 | 72°F | 37°F | 92°F 1979 | 25°F 1962 | 20% | 0% |
| Sep 9 | 72°F | 36°F | 92°F 2021 | 23°F 1962 | 20% | 0% |
| Sep 10 | 72°F | 36°F | 88°F 1959 | 29°F 1983 | 20% | 0% |
| Sep 11 | 71°F | 36°F | 90°F 1990 | 26°F 1989 | 20% | 0% |
| Sep 12 | 71°F | 36°F | 91°F 1953 | 22°F 1989 | 21% | 0% |
| Sep 13 | 70°F | 35°F | 90°F 1948 | 22°F 1974 | 21% | 0% |
| Sep 14 | 70°F | 35°F | 91°F 1948 | 22°F 1947 | 21% | 0% |
| Sep 15 | 69°F | 35°F | 92°F 2000 | 24°F 1965 | 21% | 0% |
| Sep 16 | 69°F | 35°F | 87°F 1979 | 20°F 1965 | 22% | 0% |
| Sep 17 | 68°F | 35°F | 85°F 1943 | 14°F 1965 | 22% | 0% |
| Sep 18 | 68°F | 34°F | 89°F 1981 | 17°F 1965 | 22% | 0% |
| Sep 19 | 68°F | 34°F | 88°F 1956 | 16°F 1983 | 22% | 0% |
| Sep 20 | 67°F | 34°F | 84°F 1991 | 10°F 1983 | 23% | 1% |
| Sep 21 | 67°F | 33°F | 86°F 1967 | 24°F 1983 | 23% | 1% |
| Sep 22 | 66°F | 33°F | 86°F 1987 | 24°F 1961 | 23% | 1% |
| Sep 23 | 66°F | 33°F | 88°F 1987 | 22°F 2000 | 23% | 1% |
| Sep 24 | 65°F | 33°F | 87°F 2001 | 18°F 2000 | 23% | 1% |
| Sep 25 | 65°F | 32°F | 87°F 2001 | 20°F 1984 | 23% | 1% |
| Sep 26 | 64°F | 32°F | 87°F 1952 | 21°F 1972 | 23% | 1% |
| Sep 27 | 63°F | 32°F | 84°F 1963 | 22°F 1961 | 24% | 1% |
| Sep 28 | 63°F | 31°F | 86°F 2010 | 21°F 1985 | 24% | 1% |
| Sep 29 | 62°F | 31°F | 86°F 1963 | 11°F 1985 | 24% | 1% |
| Sep 30 | 62°F | 31°F | 85°F 1963 | 15°F 1950 | 24% | 1% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:54 AM, sunset 8:09 PM
- September 30
- sunrise 7:29 AM, sunset 7:14 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00004137 (Dillon 18 Wsw), public domain. Records: NOAA GHCN-Daily, station USW00024138, 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.