Plentywood Weather in September
Average highs run from 78°F on September 1 to 64°F on September 30, and lows from 46°F to 34°F. Normal precipitation for the month is 1.26 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
- 72°F
- Average low
- 40°F
- Precipitation
- 1.26 in
- Record high
- 105°FSep 6, 1906
- Record low
- 16°FSep 21, 1995
- Chance of a freeze
- 97%
- Days of 90°F or more
- 2.0
- Daylight
- 13 h 25 min to 11 h 42 min
- Cloud cover
- 58%
- Humidity
- 58%
- Dew point
- 40°F
- Wind
- 11.0 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 | 46°F | 98°F 1991 | 36°F 1994 | 20% | 0% |
| Sep 2 | 77°F | 45°F | 99°F 2022 | 37°F 1994 | 20% | 0% |
| Sep 3 | 77°F | 45°F | 99°F 2015 | 32°F 2008 | 20% | 0% |
| Sep 4 | 77°F | 45°F | 101°F 1998 | 37°F 1986 | 20% | 0% |
| Sep 5 | 76°F | 44°F | 95°F 1990 | 30°F 2018 | 20% | 0% |
| Sep 6 | 76°F | 44°F | 105°F 1906 | 29°F 2018 | 20% | 0% |
| Sep 7 | 75°F | 43°F | 99°F 1906 | 28°F 2004 | 20% | 0% |
| Sep 8 | 75°F | 43°F | 101°F 1906 | 22°F 2020 | 20% | 0% |
| Sep 9 | 75°F | 43°F | 98°F 1994 | 19°F 2020 | 20% | 0% |
| Sep 10 | 74°F | 42°F | 92°F 2017 | 25°F 2001 | 20% | |
| Sep 11 | 74°F | 42°F | 87°F 1990 | 26°F 1906 | 20% | |
| Sep 12 | 73°F | 41°F | 94°F 1990 | 22°F 1989 | 20% | |
| Sep 13 | 73°F | 41°F | 87°F 2015 | 25°F 1906 | 20% | |
| Sep 14 | 72°F | 41°F | 87°F 2013 | 19°F 2007 | 20% | |
| Sep 15 | 72°F | 40°F | 94°F 1906 | 24°F 1999 | 20% | |
| Sep 16 | 72°F | 40°F | 96°F 1998 | 24°F 1999 | 20% | |
| Sep 17 | 71°F | 39°F | 95°F 2000 | 24°F 1999 | 20% | |
| Sep 18 | 71°F | 39°F | 88°F 2009 | 21°F 2010 | 20% | |
| Sep 19 | 70°F | 39°F | 95°F 2021 | 20°F 1991 | 20% | |
| Sep 20 | 70°F | 38°F | 89°F 2009 | 19°F 2013 | 20% | |
| Sep 21 | 69°F | 38°F | 84°F 1999 | 16°F 1995 | 20% | |
| Sep 22 | 69°F | 37°F | 95°F 1906 | 26°F 1995 | 20% | |
| Sep 23 | 68°F | 37°F | 102°F 1906 | 25°F 2000 | 20% | |
| Sep 24 | 68°F | 37°F | 100°F 1906 | 17°F 2000 | 19% | |
| Sep 25 | 67°F | 36°F | 98°F 1906 | 21°F 2000 | 19% | |
| Sep 26 | 67°F | 36°F | 96°F 2014 | 24°F 2001 | 19% | |
| Sep 27 | 66°F | 35°F | 101°F 1906 | 21°F 1985 | 19% | |
| Sep 28 | 66°F | 35°F | 92°F 1906 | 20°F 1999 | 19% | |
| Sep 29 | 65°F | 35°F | 96°F 1906 | 22°F 2018 | 19% | |
| Sep 30 | 64°F | 34°F | 91°F 1992 | 18°F 2003 | 19% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- September 1
- sunrise 6:15 AM, sunset 7:40 PM
- September 30
- sunrise 6:57 AM, sunset 6:39 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00246586 (Plentywood), public domain. Records: NOAA GHCN-Daily, station USC00246586, 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.