Post Falls Weather in September
Average highs run from 79°F on September 1 to 67°F on September 30, and lows from 52°F to 44°F. Normal precipitation for the month is 0.81 in over about 6 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
- 48°F
- Precipitation
- 0.81 in
- Record high
- 102°FSep 1, 1967
- Record low
- 17°FSep 24, 1926
- Chance of a freeze
- 6%
- Days of 90°F or more
- 1.5
- Daylight
- 13 h 22 min to 11 h 43 min
- Cloud cover
- 48%
- Humidity
- 54%
- Dew point
- 40°F
- Wind
- 5.6 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 79°F | 52°F | 102°F 1967 | 38°F 1913 | 15% |
| Sep 2 | 79°F | 52°F | 101°F 2025 | 31°F 1913 | 15% |
| Sep 3 | 78°F | 52°F | 102°F 2025 | 33°F 1958 | 16% |
| Sep 4 | 78°F | 52°F | 101°F 1938 | 38°F 1918 | 16% |
| Sep 5 | 78°F | 51°F | 98°F 1973 | 36°F 1956 | 16% |
| Sep 6 | 77°F | 51°F | 97°F 1944 | 34°F 1895 | 17% |
| Sep 7 | 77°F | 51°F | 98°F 1944 | 29°F 1929 | 17% |
| Sep 8 | 77°F | 51°F | 96°F 1958 | 30°F 1929 | 17% |
| Sep 9 | 76°F | 50°F | 94°F 1940 | 34°F 1943 | 18% |
| Sep 10 | 76°F | 50°F | 97°F 1958 | 26°F 1921 | 18% |
| Sep 11 | 76°F | 50°F | 96°F 1958 | 35°F 1921 | 18% |
| Sep 12 | 75°F | 50°F | 92°F 1913 | 29°F 1970 | 19% |
| Sep 13 | 75°F | 49°F | 93°F 1948 | 24°F 1921 | 19% |
| Sep 14 | 75°F | 49°F | 90°F 1953 | 25°F 1921 | 20% |
| Sep 15 | 74°F | 49°F | 92°F 1938 | 27°F 1921 | 20% |
| Sep 16 | 74°F | 48°F | 92°F 1979 | 27°F 1965 | 21% |
| Sep 17 | 73°F | 48°F | 95°F 1981 | 30°F 1936 | 21% |
| Sep 18 | 73°F | 48°F | 97°F 1981 | 28°F 1942 | 22% |
| Sep 19 | 73°F | 47°F | 98°F 1938 | 28°F 1957 | 22% |
| Sep 20 | 72°F | 47°F | 90°F 1979 | 24°F 1934 | 22% |
| Sep 21 | 72°F | 47°F | 93°F 1967 | 30°F 1895 | 23% |
| Sep 22 | 71°F | 46°F | 93°F 1938 | 28°F 1932 | 23% |
| Sep 23 | 71°F | 46°F | 93°F 1966 | 28°F 2000 | 24% |
| Sep 24 | 70°F | 46°F | 94°F 1943 | 17°F 1926 | 24% |
| Sep 25 | 70°F | 45°F | 94°F 1943 | 22°F 1926 | 24% |
| Sep 26 | 69°F | 45°F | 90°F 1963 | 25°F 1926 | 25% |
| Sep 27 | 69°F | 45°F | 89°F 1967 | 29°F 1935 | 25% |
| Sep 28 | 68°F | 44°F | 90°F 2022 | 27°F 1985 | 26% |
| Sep 29 | 68°F | 44°F | 89°F 1967 | 27°F 1950 | 26% |
| Sep 30 | 67°F | 44°F | 86°F 1976 | 26°F 1950 | 27% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:06 AM, sunset 7:28 PM
- September 30
- sunrise 6:46 AM, sunset 6:29 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00101956 (Coeur D'alene), public domain. Records: NOAA GHCN-Daily, station USC00101956, 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.