Thoreau Weather in September
Average highs run from 84°F on September 1 to 76°F on September 30, and lows from 48°F to 36°F. Normal precipitation for the month is 1.39 in over about 7 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
- 81°F
- Average low
- 42°F
- Precipitation
- 1.39 in
- Record high
- 96°FSep 5, 2002
- Record low
- 20°FSep 27, 1970
- Chance of a freeze
- 68%
- Days of 90°F or more
- 0.8
- Daylight
- 12 h 55 min to 11 h 51 min
- Cloud cover
- 38%
- Humidity
- 46%
- Dew point
- 38°F
- Wind
- 8.3 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 | 84°F | 48°F | 94°F 1995 | 36°F 1956 | 33% | 0% |
| Sep 2 | 84°F | 47°F | 95°F 2005 | 37°F 1956 | 32% | 0% |
| Sep 3 | 84°F | 47°F | 95°F 2010 | 39°F 1961 | 32% | 0% |
| Sep 4 | 84°F | 47°F | 93°F 2000 | 29°F 1961 | 31% | 0% |
| Sep 5 | 84°F | 46°F | 96°F 2002 | 31°F 1961 | 31% | 0% |
| Sep 6 | 83°F | 46°F | 94°F 1979 | 37°F 1968 | 30% | 0% |
| Sep 7 | 83°F | 46°F | 93°F 2008 | 35°F 1970 | 30% | 0% |
| Sep 8 | 83°F | 45°F | 91°F 1974 | 32°F 2001 | 29% | 0% |
| Sep 9 | 83°F | 45°F | 92°F 2004 | 31°F 2001 | 29% | 0% |
| Sep 10 | 82°F | 45°F | 92°F 2016 | 36°F 1953 | 28% | 0% |
| Sep 11 | 82°F | 44°F | 93°F 2004 | 33°F 1986 | 28% | 0% |
| Sep 12 | 82°F | 44°F | 91°F 2000 | 34°F 1957 | 27% | 0% |
| Sep 13 | 82°F | 43°F | 93°F 2004 | 36°F 1985 | 27% | 0% |
| Sep 14 | 81°F | 43°F | 92°F 2000 | 33°F 1967 | 26% | 0% |
| Sep 15 | 81°F | 43°F | 93°F 2000 | 32°F 1957 | 26% | 0% |
| Sep 16 | 81°F | 42°F | 94°F 2010 | 31°F 1970 | 25% | 0% |
| Sep 17 | 80°F | 42°F | 90°F 2004 | 29°F 1968 | 24% | 0% |
| Sep 18 | 80°F | 41°F | 92°F 2010 | 28°F 2006 | 24% | |
| Sep 19 | 80°F | 41°F | 93°F 2010 | 27°F 2006 | 23% | |
| Sep 20 | 79°F | 40°F | 94°F 2010 | 24°F 1971 | 23% | |
| Sep 21 | 79°F | 40°F | 89°F 1993 | 28°F 1965 | 22% | |
| Sep 22 | 79°F | 40°F | 91°F 2010 | 30°F 1965 | 22% | |
| Sep 23 | 78°F | 39°F | 90°F 2003 | 26°F 1970 | 21% | |
| Sep 24 | 78°F | 39°F | 90°F 1998 | 26°F 2000 | 21% | |
| Sep 25 | 78°F | 38°F | 91°F 2001 | 26°F 1959 | 20% | |
| Sep 26 | 77°F | 38°F | 90°F 2001 | 25°F 1970 | 20% | |
| Sep 27 | 77°F | 37°F | 91°F 2001 | 20°F 1970 | 20% | |
| Sep 28 | 76°F | 37°F | 91°F 2001 | 25°F 2013 | 19% | |
| Sep 29 | 76°F | 36°F | 94°F 2010 | 26°F 1974 | 19% | |
| Sep 30 | 76°F | 36°F | 91°F 2003 | 25°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 6:45 AM, sunset 7:40 PM
- September 30
- sunrise 7:07 AM, sunset 6:58 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00298834 (Thoreau 12 Se), public domain. Records: NOAA GHCN-Daily, station USC00293682, 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.