Alpine County Weather in September
Average highs run from 87°F on September 1 to 76°F on September 30, and lows from 50°F to 41°F. Normal precipitation for the month is 0.19 in over about 1 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
- 82°F
- Average low
- 46°F
- Precipitation
- 0.19 in
- Record high
- 94°FSep 4, 1988
- Record low
- 19°FSep 25, 1984
- Chance of a freeze
- 30%
- Days of 90°F or more
- 5.1
- Daylight
- 13 h 00 min to 11 h 49 min
- Cloud cover
- 26%
- Humidity
- 38%
- Dew point
- 28°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 | 87°F | 50°F | 88°F 1988 | 27°F 1999 | 5% | 0% |
| Sep 2 | 87°F | 50°F | 89°F 1988 | 26°F 1973 | 5% | 0% |
| Sep 3 | 87°F | 50°F | 89°F 2020 | 28°F 1994 | 4% | 0% |
| Sep 4 | 86°F | 50°F | 94°F 1988 | 29°F 1999 | 4% | 0% |
| Sep 5 | 86°F | 49°F | 94°F 1988 | 30°F 1995 | 4% | 0% |
| Sep 6 | 86°F | 49°F | 93°F 2022 | 24°F 2000 | 4% | 0% |
| Sep 7 | 85°F | 49°F | 90°F 1988 | 27°F 2002 | 4% | 0% |
| Sep 8 | 85°F | 49°F | 90°F 1988 | 25°F 1978 | 4% | 0% |
| Sep 9 | 85°F | 48°F | 88°F 1988 | 29°F 1979 | 4% | 0% |
| Sep 10 | 84°F | 48°F | 87°F 2015 | 28°F 1986 | 4% | 0% |
| Sep 11 | 84°F | 48°F | 88°F 1990 | 23°F 2005 | 4% | 0% |
| Sep 12 | 83°F | 47°F | 88°F 1990 | 22°F 1972 | 4% | 0% |
| Sep 13 | 83°F | 47°F | 85°F 1990 | 24°F 1985 | 4% | 0% |
| Sep 14 | 83°F | 47°F | 88°F 1990 | 22°F 1970 | 4% | 0% |
| Sep 15 | 82°F | 46°F | 85°F 1981 | 26°F 1970 | 4% | 0% |
| Sep 16 | 82°F | 46°F | 85°F 1981 | 22°F 2006 | 4% | 0% |
| Sep 17 | 81°F | 46°F | 82°F 1995 | 25°F 1996 | 4% | 0% |
| Sep 18 | 81°F | 45°F | 85°F 2009 | 24°F 1986 | 4% | 0% |
| Sep 19 | 81°F | 45°F | 82°F 1991 | 22°F 1978 | 4% | 0% |
| Sep 20 | 80°F | 45°F | 84°F 2000 | 20°F 1978 | 4% | 0% |
| Sep 21 | 80°F | 44°F | 84°F 2000 | 22°F 1986 | 4% | 0% |
| Sep 22 | 79°F | 44°F | 83°F 2011 | 24°F 1980 | 4% | 0% |
| Sep 23 | 79°F | 44°F | 83°F 2009 | 23°F 1972 | 4% | 0% |
| Sep 24 | 79°F | 43°F | 84°F 2009 | 23°F 1993 | 4% | 0% |
| Sep 25 | 78°F | 43°F | 84°F 2009 | 19°F 1984 | 4% | 0% |
| Sep 26 | 78°F | 42°F | 85°F 2009 | 24°F 1970 | 4% | 0% |
| Sep 27 | 77°F | 42°F | 85°F 2009 | 23°F 1971 | 4% | 0% |
| Sep 28 | 77°F | 42°F | 83°F 2010 | 24°F 1986 | 4% | 0% |
| Sep 29 | 77°F | 41°F | 85°F 2010 | 24°F 1986 | 4% | 0% |
| Sep 30 | 76°F | 41°F | 85°F 2010 | 26°F 1980 | 4% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:29 AM, sunset 7:29 PM
- September 30
- sunrise 6:54 AM, sunset 6:43 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00268186 (Topaz Lake), public domain. Records: NOAA GHCN-Daily, station USW00093230, 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.