Fort Duchesne Weather in September
Average highs run from 85°F on September 1 to 73°F on September 30, and lows from 49°F to 39°F. Normal precipitation for the month is 0.81 in over about 4 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
- 79°F
- Average low
- 44°F
- Precipitation
- 0.81 in
- Record high
- 99°FSep 7, 2020
- Record low
- 22°FSep 25, 1970
- Chance of a freeze
- 43%
- Days of 90°F or more
- 4.0
- Daylight
- 13 h 04 min to 11 h 48 min
- Cloud cover
- 41%
- Humidity
- 44%
- Dew point
- 31°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 | 85°F | 49°F | 95°F 1950 | 34°F 2019 | 13% | 0% |
| Sep 2 | 85°F | 49°F | 97°F 1958 | 32°F 2019 | 13% | 0% |
| Sep 3 | 84°F | 48°F | 95°F 1950 | 30°F 2019 | 13% | 0% |
| Sep 4 | 84°F | 48°F | 95°F 2022 | 35°F 1961 | 13% | 0% |
| Sep 5 | 84°F | 48°F | 96°F 1962 | 37°F 2004 | 13% | 0% |
| Sep 6 | 83°F | 47°F | 97°F 2022 | 36°F 1968 | 13% | 0% |
| Sep 7 | 83°F | 47°F | 99°F 2020 | 35°F 2010 | 13% | 0% |
| Sep 8 | 83°F | 47°F | 97°F 2022 | 35°F 2001 | 13% | 0% |
| Sep 9 | 82°F | 47°F | 94°F 2022 | 30°F 1962 | 13% | 0% |
| Sep 10 | 82°F | 46°F | 93°F 1959 | 31°F 2020 | 13% | 0% |
| Sep 11 | 81°F | 46°F | 93°F 1958 | 32°F 1928 | 13% | 0% |
| Sep 12 | 81°F | 46°F | 93°F 1959 | 32°F 1951 | 13% | 0% |
| Sep 13 | 81°F | 45°F | 94°F 1990 | 33°F 1967 | 13% | 0% |
| Sep 14 | 80°F | 45°F | 94°F 1990 | 32°F 1993 | 13% | 0% |
| Sep 15 | 80°F | 45°F | 91°F 1990 | 28°F 1970 | 13% | 0% |
| Sep 16 | 79°F | 44°F | 92°F 2000 | 32°F 1971 | 13% | 0% |
| Sep 17 | 79°F | 44°F | 92°F 1932 | 31°F 1968 | 13% | 0% |
| Sep 18 | 78°F | 44°F | 92°F 1922 | 25°F 1971 | 13% | 0% |
| Sep 19 | 78°F | 43°F | 94°F 1935 | 25°F 1971 | 13% | 0% |
| Sep 20 | 77°F | 43°F | 92°F 1956 | 26°F 1978 | 13% | 0% |
| Sep 21 | 77°F | 43°F | 87°F 1935 | 26°F 1978 | 12% | 0% |
| Sep 22 | 77°F | 42°F | 88°F 1935 | 28°F 1968 | 13% | 0% |
| Sep 23 | 76°F | 42°F | 87°F 1958 | 29°F 1985 | 13% | 0% |
| Sep 24 | 76°F | 42°F | 88°F 1943 | 29°F 1961 | 13% | 0% |
| Sep 25 | 75°F | 41°F | 88°F 2003 | 22°F 1970 | 12% | 0% |
| Sep 26 | 75°F | 41°F | 88°F 1921 | 26°F 1970 | 12% | 0% |
| Sep 27 | 74°F | 41°F | 88°F 2019 | 22°F 2007 | 12% | 0% |
| Sep 28 | 74°F | 40°F | 88°F 2024 | 23°F 1945 | 13% | 0% |
| Sep 29 | 73°F | 40°F | 89°F 1933 | 22°F 1945 | 13% | 0% |
| Sep 30 | 73°F | 39°F | 88°F 1957 | 23°F 1985 | 13% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:47 AM, sunset 7:51 PM
- September 30
- sunrise 7:15 AM, sunset 7:03 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00422996 (Ft Duchesne), public domain. Records: NOAA GHCN-Daily, station USC00425969, 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.