Teton County Weather in September
Average highs run from 72°F on September 1 to 60°F on September 30, and lows from 37°F to 30°F. Normal precipitation for the month is 1.64 in over about 8 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
- 66°F
- Average low
- 34°F
- Precipitation
- 1.64 in
- Snowfall
- 0.4 in
- Record high
- 95°FSep 7, 2022
- Record low
- 6°FSep 19, 1987
- Chance of a freeze
- 100%
- Daylight
- 13 h 12 min to 11 h 46 min
- Cloud cover
- 50%
- Humidity
- 55%
- Dew point
- 30°F
- Wind
- 5.1 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 | 72°F | 37°F | 89°F 2016 | 25°F 1965 | 26% | 0% |
| Sep 2 | 71°F | 37°F | 90°F 2019 | 27°F 1970 | 26% | 0% |
| Sep 3 | 71°F | 37°F | 89°F 2017 | 25°F 1981 | 26% | 0% |
| Sep 4 | 71°F | 36°F | 91°F 2017 | 23°F 1964 | 26% | 0% |
| Sep 5 | 70°F | 36°F | 92°F 2022 | 22°F 1965 | 26% | 0% |
| Sep 6 | 70°F | 36°F | 92°F 2020 | 22°F 1987 | 26% | 0% |
| Sep 7 | 70°F | 36°F | 95°F 2022 | 21°F 2000 | 26% | 0% |
| Sep 8 | 69°F | 35°F | 91°F 2022 | 24°F 1964 | 27% | 0% |
| Sep 9 | 69°F | 35°F | 85°F 2005 | 18°F 1962 | 27% | 1% |
| Sep 10 | 69°F | 35°F | 88°F 2021 | 21°F 1962 | 27% | 1% |
| Sep 11 | 68°F | 35°F | 84°F 1959 | 20°F 1964 | 27% | 1% |
| Sep 12 | 68°F | 35°F | 87°F 1990 | 12°F 2014 | 27% | 1% |
| Sep 13 | 68°F | 34°F | 87°F 2000 | 20°F 1974 | 27% | 1% |
| Sep 14 | 67°F | 34°F | 82°F 1990 | 21°F 1974 | 27% | 1% |
| Sep 15 | 67°F | 34°F | 88°F 1990 | 19°F 1970 | 27% | 1% |
| Sep 16 | 66°F | 34°F | 88°F 2000 | 23°F 1965 | 27% | 1% |
| Sep 17 | 66°F | 33°F | 88°F 2000 | 18°F 1971 | 27% | 1% |
| Sep 18 | 66°F | 33°F | 84°F 2009 | 15°F 1971 | 27% | 2% |
| Sep 19 | 65°F | 33°F | 84°F 2009 | 6°F 1987 | 27% | 2% |
| Sep 20 | 65°F | 33°F | 81°F 2010 | 9°F 1983 | 27% | 2% |
| Sep 21 | 64°F | 32°F | 80°F 1966 | 8°F 1987 | 27% | 2% |
| Sep 22 | 64°F | 32°F | 80°F 1966 | 11°F 1983 | 27% | 2% |
| Sep 23 | 63°F | 32°F | 80°F 1987 | 17°F 2002 | 27% | 3% |
| Sep 24 | 63°F | 32°F | 83°F 1987 | 20°F 1965 | 27% | 3% |
| Sep 25 | 62°F | 31°F | 85°F 2001 | 17°F 1970 | 27% | 3% |
| Sep 26 | 62°F | 31°F | 83°F 2015 | 19°F 1970 | 27% | 3% |
| Sep 27 | 61°F | 31°F | 84°F 2010 | 15°F 1996 | 27% | 4% |
| Sep 28 | 61°F | 31°F | 82°F 2009 | 15°F 1999 | 27% | 4% |
| Sep 29 | 60°F | 30°F | 84°F 2010 | 10°F 1985 | 27% | 4% |
| Sep 30 | 60°F | 30°F | 78°F 2011 | 19°F 1965 | 27% | 4% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:46 AM, sunset 7:58 PM
- September 30
- sunrise 7:19 AM, sunset 7:05 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00486440 (Moran 5WNW), public domain. Records: NOAA GHCN-Daily, station USC00486428, 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.