Crestline Weather in September
Average highs run from 79°F on September 1 to 69°F on September 30, and lows from 55°F to 48°F. Normal precipitation for the month is 0.31 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
- 74°F
- Average low
- 52°F
- Precipitation
- 0.31 in
- Record high
- 115°FSep 13, 1971
- Record low
- 41°FSep 9, 1901
- Chance of a freeze
- 0%
- Daylight
- 12 h 52 min to 11 h 51 min
- Cloud cover
- 16%
- Humidity
- 41%
- Dew point
- 45°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 | 79°F | 55°F | 110°F 2007 | 48°F 1907 | 2% | 0% |
| Sep 2 | 79°F | 55°F | 110°F 1982 | 49°F 1926 | 2% | 0% |
| Sep 3 | 79°F | 55°F | 112°F 1988 | 49°F 1921 | 2% | 0% |
| Sep 4 | 78°F | 55°F | 109°F 1984 | 46°F 1912 | 2% | 0% |
| Sep 5 | 78°F | 55°F | 110°F 1984 | 45°F 1912 | 2% | 0% |
| Sep 6 | 78°F | 54°F | 112°F 1955 | 46°F 1912 | 2% | 0% |
| Sep 7 | 77°F | 54°F | 109°F 1898 | 47°F 1901 | 2% | 0% |
| Sep 8 | 77°F | 54°F | 108°F 1979 | 43°F 1914 | 2% | 0% |
| Sep 9 | 77°F | 54°F | 112°F 1979 | 41°F 1901 | 2% | 0% |
| Sep 10 | 76°F | 54°F | 107°F 1898 | 42°F 1901 | 2% | 0% |
| Sep 11 | 76°F | 53°F | 110°F 1971 | 46°F 1900 | 2% | 0% |
| Sep 12 | 76°F | 53°F | 114°F 1971 | 47°F 1952 | 2% | 0% |
| Sep 13 | 75°F | 53°F | 115°F 1971 | 46°F 1921 | 2% | 0% |
| Sep 14 | 75°F | 53°F | 107°F 1929 | 45°F 1939 | 2% | 0% |
| Sep 15 | 75°F | 52°F | 105°F 1937 | 46°F 1907 | 2% | 0% |
| Sep 16 | 74°F | 52°F | 109°F 2000 | 46°F 1921 | 2% | 0% |
| Sep 17 | 74°F | 52°F | 108°F 1922 | 45°F 1908 | 2% | 0% |
| Sep 18 | 73°F | 51°F | 105°F 1899 | 44°F 1924 | 3% | 0% |
| Sep 19 | 73°F | 51°F | 106°F 1899 | 46°F 1925 | 3% | 0% |
| Sep 20 | 73°F | 51°F | 104°F 1899 | 47°F 1925 | 3% | 0% |
| Sep 21 | 72°F | 51°F | 109°F 2003 | 46°F 2007 | 3% | 0% |
| Sep 22 | 72°F | 50°F | 106°F 1949 | 46°F 1944 | 3% | 0% |
| Sep 23 | 71°F | 50°F | 107°F 2002 | 46°F 1941 | 3% | 0% |
| Sep 24 | 71°F | 50°F | 106°F 1991 | 43°F 1923 | 3% | 0% |
| Sep 25 | 71°F | 49°F | 107°F 1963 | 44°F 1934 | 3% | 0% |
| Sep 26 | 70°F | 49°F | 108°F 2009 | 43°F 1948 | 3% | 0% |
| Sep 27 | 70°F | 49°F | 109°F 2010 | 45°F 1923 | 3% | 0% |
| Sep 28 | 69°F | 49°F | 107°F 1963 | 44°F 1971 | 3% | 0% |
| Sep 29 | 69°F | 48°F | 105°F 1963 | 43°F 1909 | 3% | 0% |
| Sep 30 | 69°F | 48°F | 108°F 1980 | 44°F 1940 | 3% | 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 7:15 PM
- September 30
- sunrise 6:43 AM, sunset 6:34 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00044671 (Lake Arrowhead), public domain. Records: NOAA GHCN-Daily, station USC00047306, 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.