Fossil Weather in September
Average highs run from 79°F on September 1 to 70°F on September 30, and lows from 43°F to 37°F. Normal precipitation for the month is 0.55 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
- 74°F
- Average low
- 40°F
- Precipitation
- 0.55 in
- Record high
- 99°FSep 6, 1955
- Record low
- 19°FSep 24, 1926
- Chance of a freeze
- 78%
- Days of 90°F or more
- 2.6
- Daylight
- 13 h 15 min to 11 h 45 min
- Cloud cover
- 39%
- Humidity
- 57%
- Dew point
- 41°F
- Wind
- 7.2 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 | 79°F | 43°F | 97°F 1987 | 34°F 1913 | 6% | 0% |
| Sep 2 | 79°F | 42°F | 96°F 1987 | 38°F 1932 | 6% | 0% |
| Sep 3 | 78°F | 42°F | 97°F 2022 | 37°F 1958 | 6% | 0% |
| Sep 4 | 78°F | 42°F | 98°F 2003 | 34°F 1910 | 6% | 0% |
| Sep 5 | 78°F | 42°F | 98°F 1988 | 37°F 1969 | 7% | 0% |
| Sep 6 | 77°F | 42°F | 99°F 1955 | 35°F 1929 | 7% | 0% |
| Sep 7 | 77°F | 42°F | 99°F 1955 | 32°F 1901 | 7% | 0% |
| Sep 8 | 77°F | 41°F | 96°F 1944 | 34°F 1962 | 7% | 0% |
| Sep 9 | 76°F | 41°F | 95°F 1981 | 35°F 1962 | 7% | 0% |
| Sep 10 | 76°F | 41°F | 95°F 1963 | 35°F 1913 | 7% | 0% |
| Sep 11 | 76°F | 41°F | 94°F 1899 | 35°F 1921 | 8% | 0% |
| Sep 12 | 75°F | 41°F | 97°F 1953 | 27°F 1921 | 8% | 0% |
| Sep 13 | 75°F | 41°F | 93°F 2002 | 25°F 1970 | 8% | 0% |
| Sep 14 | 75°F | 40°F | 94°F 1959 | 30°F 1921 | 8% | 0% |
| Sep 15 | 75°F | 40°F | 92°F 1979 | 33°F 1921 | 8% | 0% |
| Sep 16 | 74°F | 40°F | 93°F 1909 | 28°F 1965 | 9% | 0% |
| Sep 17 | 74°F | 40°F | 94°F 1981 | 27°F 1965 | 9% | 0% |
| Sep 18 | 74°F | 40°F | 94°F 1906 | 28°F 1965 | 9% | 0% |
| Sep 19 | 73°F | 39°F | 91°F 1906 | 31°F 1957 | 9% | 0% |
| Sep 20 | 73°F | 39°F | 93°F 1897 | 32°F 1983 | 9% | 0% |
| Sep 21 | 73°F | 39°F | 92°F 2012 | 31°F 1895 | 10% | 0% |
| Sep 22 | 72°F | 39°F | 90°F 1905 | 31°F 2000 | 10% | 0% |
| Sep 23 | 72°F | 38°F | 91°F 1999 | 28°F 2000 | 10% | 0% |
| Sep 24 | 72°F | 38°F | 90°F 1994 | 19°F 1926 | 10% | 0% |
| Sep 25 | 71°F | 38°F | 95°F 1952 | 20°F 1926 | 10% | 0% |
| Sep 26 | 71°F | 38°F | 97°F 1952 | 22°F 1926 | 11% | 0% |
| Sep 27 | 71°F | 38°F | 88°F 2003 | 29°F 1972 | 11% | 0% |
| Sep 28 | 70°F | 37°F | 90°F 1967 | 28°F 1985 | 11% | 0% |
| Sep 29 | 70°F | 37°F | 90°F 1996 | 26°F 1985 | 11% | 0% |
| Sep 30 | 70°F | 37°F | 86°F 1970 | 28°F 1954 | 11% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:23 AM, sunset 7:38 PM
- September 30
- sunrise 6:58 AM, sunset 6:43 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00353038 (Fossil), public domain. Records: NOAA GHCN-Daily, station USC00353827, 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.