Prineville Weather in September
Average highs run from 83°F on September 1 to 73°F on September 30, and lows from 45°F to 38°F. Normal precipitation for the month is 0.31 in over about 3 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
- 79°F
- Average low
- 42°F
- Precipitation
- 0.31 in
- Record high
- 107°FSep 1, 1998
- Record low
- 12°FSep 24, 1926
- Chance of a freeze
- 67%
- Days of 90°F or more
- 4.5
- Daylight
- 13 h 13 min to 11 h 46 min
- Cloud cover
- 36%
- Humidity
- 59%
- Dew point
- 42°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 | 83°F | 45°F | 107°F 1998 | 27°F 1933 | 8% | 0% |
| Sep 2 | 83°F | 45°F | 101°F 1998 | 25°F 1956 | 8% | 0% |
| Sep 3 | 83°F | 45°F | 104°F 2022 | 24°F 1956 | 8% | 0% |
| Sep 4 | 83°F | 44°F | 98°F 2020 | 26°F 1943 | 8% | 0% |
| Sep 5 | 82°F | 44°F | 100°F 1955 | 25°F 1969 | 8% | 0% |
| Sep 6 | 82°F | 44°F | 98°F 1998 | 27°F 1929 | 8% | 0% |
| Sep 7 | 82°F | 44°F | 95°F 1944 | 22°F 1929 | 8% | 0% |
| Sep 8 | 82°F | 44°F | 97°F 1981 | 24°F 1929 | 9% | 0% |
| Sep 9 | 81°F | 43°F | 97°F 1981 | 23°F 1959 | 9% | 0% |
| Sep 10 | 81°F | 43°F | 99°F 1990 | 25°F 1970 | 9% | 0% |
| Sep 11 | 81°F | 43°F | 95°F 2011 | 21°F 1902 | 9% | 0% |
| Sep 12 | 81°F | 43°F | 95°F 1959 | 22°F 1902 | 9% | 0% |
| Sep 13 | 80°F | 43°F | 94°F 1995 | 21°F 1970 | 9% | 0% |
| Sep 14 | 80°F | 42°F | 96°F 1995 | 18°F 1970 | 10% | 0% |
| Sep 15 | 80°F | 42°F | 97°F 1995 | 20°F 1970 | 10% | 0% |
| Sep 16 | 79°F | 42°F | 97°F 1981 | 20°F 1936 | 10% | 0% |
| Sep 17 | 79°F | 42°F | 98°F 1898 | 14°F 1965 | 10% | 0% |
| Sep 18 | 79°F | 42°F | 93°F 1918 | 19°F 1965 | 11% | 0% |
| Sep 19 | 78°F | 41°F | 93°F 1991 | 20°F 1965 | 11% | 0% |
| Sep 20 | 78°F | 41°F | 92°F 1936 | 21°F 1949 | 11% | 0% |
| Sep 21 | 77°F | 41°F | 96°F 1967 | 20°F 1932 | 11% | 0% |
| Sep 22 | 77°F | 41°F | 94°F 1992 | 19°F 1960 | 12% | 0% |
| Sep 23 | 77°F | 40°F | 96°F 1994 | 16°F 1926 | 12% | 0% |
| Sep 24 | 76°F | 40°F | 96°F 2009 | 12°F 1926 | 12% | 0% |
| Sep 25 | 76°F | 40°F | 96°F 1952 | 13°F 1926 | 13% | 0% |
| Sep 26 | 75°F | 39°F | 94°F 1963 | 17°F 1926 | 13% | 0% |
| Sep 27 | 75°F | 39°F | 95°F 1963 | 19°F 1945 | 13% | 0% |
| Sep 28 | 74°F | 39°F | 92°F 1963 | 19°F 1945 | 14% | 0% |
| Sep 29 | 74°F | 39°F | 92°F 1967 | 18°F 1950 | 14% | 0% |
| Sep 30 | 73°F | 38°F | 94°F 2020 | 17°F 1954 | 14% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:26 AM, sunset 7:39 PM
- September 30
- sunrise 7:00 AM, sunset 6:46 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00356883 (Prineville), public domain. Records: NOAA GHCN-Daily, station USC00356883, 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.