Trail Weather in September
Average highs run from 88°F on September 1 to 79°F on September 30, and lows from 49°F to 42°F. Normal precipitation for the month is 0.79 in over about 4 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
- 84°F
- Average low
- 45°F
- Precipitation
- 0.79 in
- Record high
- 110°FSep 2, 1988
- Record low
- 29°FSep 30, 1950
- Chance of a freeze
- 9%
- Days of 90°F or more
- 10.9
- Daylight
- 13 h 09 min to 11 h 46 min
- Cloud cover
- 32%
- Humidity
- 52%
- Dew point
- 41°F
- Wind
- 3.8 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 | 88°F | 49°F | 107°F 1988 | 40°F 1973 | 9% | 0% |
| Sep 2 | 88°F | 48°F | 110°F 1988 | 40°F 1975 | 9% | 0% |
| Sep 3 | 88°F | 48°F | 106°F 1988 | 39°F 1964 | 9% | 0% |
| Sep 4 | 87°F | 48°F | 107°F 1955 | 41°F 1969 | 10% | 0% |
| Sep 5 | 87°F | 48°F | 105°F 2024 | 40°F 1954 | 10% | 0% |
| Sep 6 | 87°F | 48°F | 107°F 2022 | 40°F 1992 | 10% | 0% |
| Sep 7 | 87°F | 47°F | 103°F 1981 | 40°F 1960 | 11% | 0% |
| Sep 8 | 87°F | 47°F | 102°F 1943 | 37°F 1928 | 11% | 0% |
| Sep 9 | 86°F | 47°F | 103°F 1944 | 37°F 1928 | 11% | 0% |
| Sep 10 | 86°F | 47°F | 103°F 2022 | 37°F 1972 | 12% | 0% |
| Sep 11 | 86°F | 47°F | 102°F 2013 | 38°F 1972 | 12% | 0% |
| Sep 12 | 86°F | 46°F | 100°F 1945 | 37°F 1972 | 13% | 0% |
| Sep 13 | 86°F | 46°F | 101°F 1979 | 35°F 1970 | 13% | 0% |
| Sep 14 | 85°F | 46°F | 103°F 1979 | 32°F 1970 | 13% | 0% |
| Sep 15 | 85°F | 46°F | 104°F 1981 | 34°F 1936 | 14% | 0% |
| Sep 16 | 85°F | 45°F | 102°F 1938 | 36°F 1936 | 14% | 0% |
| Sep 17 | 84°F | 45°F | 102°F 1938 | 33°F 1965 | 15% | 0% |
| Sep 18 | 84°F | 45°F | 101°F 1991 | 31°F 1965 | 15% | 0% |
| Sep 19 | 84°F | 45°F | 100°F 1952 | 32°F 1978 | 16% | 0% |
| Sep 20 | 84°F | 44°F | 100°F 2014 | 32°F 1972 | 16% | 0% |
| Sep 21 | 83°F | 44°F | 101°F 1952 | 34°F 1929 | 16% | 0% |
| Sep 22 | 83°F | 44°F | 102°F 1987 | 33°F 1961 | 17% | 0% |
| Sep 23 | 82°F | 44°F | 100°F 1943 | 35°F 1930 | 17% | 0% |
| Sep 24 | 82°F | 43°F | 99°F 1991 | 33°F 1929 | 18% | 0% |
| Sep 25 | 82°F | 43°F | 100°F 1991 | 34°F 1929 | 18% | 0% |
| Sep 26 | 81°F | 43°F | 104°F 1963 | 34°F 1934 | 19% | 0% |
| Sep 27 | 81°F | 43°F | 102°F 1963 | 32°F 1929 | 19% | 0% |
| Sep 28 | 80°F | 42°F | 98°F 2020 | 31°F 1929 | 20% | 0% |
| Sep 29 | 80°F | 42°F | 98°F 2020 | 31°F 1961 | 20% | 0% |
| Sep 30 | 79°F | 42°F | 98°F 1987 | 29°F 1950 | 21% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:36 AM, sunset 7:45 PM
- September 30
- sunrise 7:08 AM, sunset 6:54 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00355055 (Lost Creek Dam), public domain. Records: NOAA GHCN-Daily, station USW00024225, 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.