Downieville Weather in September
Average highs run from 87°F on September 1 to 79°F on September 30, and lows from 48°F to 43°F. Normal precipitation for the month is 0.66 in over about 2 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
- 83°F
- Average low
- 46°F
- Precipitation
- 0.66 in
- Record high
- 96°FSep 6, 2022
- Record low
- 27°FSep 30, 1971
- Chance of a freeze
- 2%
- Days of 90°F or more
- 9.5
- Daylight
- 13 h 02 min to 11 h 48 min
- Cloud cover
- 25%
- Humidity
- 32%
- Dew point
- 35°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 | 87°F | 48°F | 93°F 1950 | 34°F 1964 | 5% | 0% |
| Sep 2 | 86°F | 48°F | 92°F 1950 | 38°F 1964 | 5% | 0% |
| Sep 3 | 86°F | 48°F | 93°F 1988 | 41°F 2000 | 5% | 0% |
| Sep 4 | 86°F | 48°F | 93°F 1955 | 39°F 1970 | 5% | 0% |
| Sep 5 | 86°F | 48°F | 95°F 2022 | 40°F 1970 | 5% | 0% |
| Sep 6 | 86°F | 47°F | 96°F 2022 | 42°F 1978 | 5% | 0% |
| Sep 7 | 86°F | 47°F | 89°F 1957 | 39°F 1978 | 6% | 0% |
| Sep 8 | 85°F | 47°F | 91°F 2022 | 39°F 1985 | 6% | 0% |
| Sep 9 | 85°F | 47°F | 88°F 1951 | 32°F 1985 | 6% | 0% |
| Sep 10 | 85°F | 47°F | 89°F 1953 | 32°F 1952 | 6% | 0% |
| Sep 11 | 85°F | 47°F | 89°F 1945 | 31°F 1952 | 6% | 0% |
| Sep 12 | 85°F | 47°F | 91°F 1945 | 37°F 1966 | 7% | 0% |
| Sep 13 | 84°F | 47°F | 91°F 1971 | 36°F 1966 | 7% | 0% |
| Sep 14 | 84°F | 46°F | 89°F 1971 | 37°F 1980 | 7% | 0% |
| Sep 15 | 84°F | 46°F | 88°F 1951 | 35°F 1959 | 7% | 0% |
| Sep 16 | 84°F | 46°F | 84°F 1962 | 36°F 1946 | 7% | 0% |
| Sep 17 | 83°F | 46°F | 86°F 1984 | 34°F 1965 | 8% | 0% |
| Sep 18 | 83°F | 46°F | 86°F 1984 | 34°F 1944 | 8% | 0% |
| Sep 19 | 83°F | 46°F | 87°F 1974 | 31°F 2004 | 8% | 0% |
| Sep 20 | 83°F | 45°F | 89°F 1974 | 33°F 2004 | 8% | 0% |
| Sep 21 | 82°F | 45°F | 87°F 1987 | 34°F 1944 | 8% | 0% |
| Sep 22 | 82°F | 45°F | 87°F 1987 | 29°F 1945 | 9% | 0% |
| Sep 23 | 82°F | 45°F | 84°F 1949 | 33°F 1945 | 9% | 0% |
| Sep 24 | 81°F | 45°F | 85°F 1964 | 31°F 1948 | 9% | 0% |
| Sep 25 | 81°F | 44°F | 87°F 2003 | 30°F 1948 | 9% | 0% |
| Sep 26 | 81°F | 44°F | 89°F 2009 | 33°F 1971 | 9% | 0% |
| Sep 27 | 80°F | 44°F | 86°F 2009 | 34°F 1971 | 10% | 0% |
| Sep 28 | 80°F | 44°F | 85°F 2010 | 32°F 2019 | 10% | 0% |
| Sep 29 | 80°F | 43°F | 87°F 1966 | 30°F 1971 | 10% | 0% |
| Sep 30 | 79°F | 43°F | 85°F 1980 | 27°F 1971 | 10% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:32 AM, sunset 7:34 PM
- September 30
- sunrise 6:59 AM, sunset 6:47 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00042500 (Downieville), public domain. Records: NOAA GHCN-Daily, station USW00023225, 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.