Ritzville Weather in September
Average highs run from 82°F on September 1 to 71°F on September 30, and lows from 50°F to 42°F. Normal precipitation for the month is 0.43 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
- 77°F
- Average low
- 46°F
- Precipitation
- 0.43 in
- Record high
- 100°FSep 1, 1967
- Record low
- 17°FSep 24, 1926
- Chance of a freeze
- 19%
- Days of 90°F or more
- 2.8
- Daylight
- 13 h 20 min to 11 h 44 min
- Cloud cover
- 43%
- Humidity
- 49%
- Dew point
- 42°F
- Wind
- 7.6 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 | 82°F | 50°F | 100°F 1967 | 32°F 1966 | 11% | 0% |
| Sep 2 | 81°F | 50°F | 96°F 1987 | 31°F 2012 | 11% | 0% |
| Sep 3 | 81°F | 49°F | 98°F 2025 | 30°F 2016 | 11% | 0% |
| Sep 4 | 81°F | 49°F | 98°F 1988 | 31°F 2015 | 11% | 0% |
| Sep 5 | 81°F | 49°F | 97°F 1988 | 28°F 1996 | 11% | 0% |
| Sep 6 | 80°F | 49°F | 95°F 1988 | 31°F 1913 | 11% | 0% |
| Sep 7 | 80°F | 48°F | 97°F 1958 | 26°F 1933 | 12% | 0% |
| Sep 8 | 80°F | 48°F | 95°F 1958 | 30°F 1992 | 12% | 0% |
| Sep 9 | 79°F | 48°F | 95°F 1963 | 29°F 1928 | 12% | 0% |
| Sep 10 | 79°F | 48°F | 92°F 2011 | 26°F 1913 | 12% | 0% |
| Sep 11 | 79°F | 47°F | 91°F 1953 | 26°F 2012 | 12% | 0% |
| Sep 12 | 78°F | 47°F | 93°F 1996 | 28°F 1962 | 12% | 0% |
| Sep 13 | 78°F | 47°F | 91°F 1923 | 26°F 1915 | 12% | 0% |
| Sep 14 | 77°F | 47°F | 90°F 1924 | 25°F 1970 | 13% | 0% |
| Sep 15 | 77°F | 46°F | 92°F 1957 | 25°F 1970 | 13% | 0% |
| Sep 16 | 77°F | 46°F | 91°F 1938 | 27°F 2006 | 13% | 0% |
| Sep 17 | 76°F | 46°F | 93°F 1981 | 27°F 1965 | 13% | 0% |
| Sep 18 | 76°F | 46°F | 95°F 1981 | 22°F 1965 | 13% | 0% |
| Sep 19 | 76°F | 45°F | 91°F 1922 | 28°F 1957 | 13% | 0% |
| Sep 20 | 75°F | 45°F | 88°F 1939 | 24°F 1934 | 14% | 0% |
| Sep 21 | 75°F | 45°F | 89°F 1979 | 26°F 2007 | 14% | 0% |
| Sep 22 | 74°F | 44°F | 90°F 1967 | 27°F 1909 | 14% | 0% |
| Sep 23 | 74°F | 44°F | 91°F 1966 | 20°F 2000 | 14% | 0% |
| Sep 24 | 73°F | 44°F | 89°F 1987 | 17°F 1926 | 14% | 0% |
| Sep 25 | 73°F | 43°F | 91°F 2011 | 22°F 1926 | 15% | 0% |
| Sep 26 | 73°F | 43°F | 88°F 1997 | 28°F 1981 | 15% | 0% |
| Sep 27 | 72°F | 43°F | 88°F 1963 | 23°F 1999 | 15% | 0% |
| Sep 28 | 72°F | 43°F | 92°F 1918 | 21°F 1999 | 15% | 0% |
| Sep 29 | 71°F | 42°F | 88°F 1918 | 20°F 1985 | 16% | 0% |
| Sep 30 | 71°F | 42°F | 84°F 1976 | 23°F 1933 | 16% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:13 AM, sunset 7:33 PM
- September 30
- sunrise 6:51 AM, sunset 6:35 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00457059 (Ritzville 1 Sse), public domain. Records: NOAA GHCN-Daily, station USC00452007, 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.