September weather in Post Falls, ID
The average temperature in Post Falls in September is 61.0°F (48.3°F–73.7°F). Average precipitation: 0.81 inches.
September is a fall month in Post Falls, and is warmer than the annual average of 48.8°F. Daily temperatures swing about 25.4°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 20m. For travel, September is a comfortable month to visit.
Avg High
73.7°F
Avg Low
48.3°F
Precipitation
0.81 in
Daylight
12h 20m
September records in Post Falls
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (1967) | 37.9°F (1913) | 0.96 in (1947) |
| September 2 | 100.9°F (2025) | 30.9°F (1913) | 0.66 in (1980) |
| September 3 | 102.0°F (2025) | 33.1°F (1958) | 0.59 in (1927) |
| September 4 | 100.9°F (1938) | 37.9°F (1918) | 0.86 in (1960) |
| September 5 | 98.1°F (1973) | 36.0°F (1956) | 1.96 in (1940) |
| September 6 | 97.0°F (1944) | 34.0°F (1895) | 0.57 in (1919) |
| September 7 | 98.1°F (1944) | 28.9°F (1929) | 0.62 in (1927) |
| September 8 | 96.1°F (1958) | 30.0°F (1929) | 0.69 in (2003) |
| September 9 | 93.9°F (1940) | 34.0°F (1943) | 0.61 in (1931) |
| September 10 | 97.0°F (1958) | 26.1°F (1921) | 0.45 in (1962) |
| September 11 | 96.1°F (1958) | 35.1°F (1921) | 1.71 in (1927) |
| September 12 | 97.0°F (2014) | 28.9°F (1970) | 1.07 in (1895) |
| September 13 | 93.0°F (1948) | 24.1°F (1921) | 0.68 in (1940) |
| September 14 | 90.0°F (1953) | 25.0°F (1921) | 0.59 in (1927) |
| September 15 | 91.9°F (1938) | 27.0°F (1921) | 0.88 in (1949) |
| September 16 | 91.9°F (1979) | 27.0°F (1965) | 0.98 in (1914) |
| September 17 | 95.0°F (1981) | 30.0°F (1936) | 0.56 in (1954) |
| September 18 | 97.0°F (1981) | 28.0°F (1942) | 1.06 in (1968) |
| September 19 | 98.1°F (1938) | 28.0°F (1957) | 0.53 in (1924) |
| September 20 | 90.0°F (1979) | 24.1°F (1934) | 1.35 in (1945) |
| September 21 | 93.0°F (1967) | 30.0°F (1895) | 0.50 in (1910) |
| September 22 | 93.0°F (1938) | 28.0°F (1932) | 0.80 in (1918) |
| September 23 | 93.0°F (1966) | 28.0°F (2000) | 0.50 in (1918) |
| September 24 | 93.9°F (1943) | 17.1°F (1926) | 0.82 in (1973) |
| September 25 | 93.9°F (1943) | 21.9°F (1926) | 0.59 in (1945) |
| September 26 | 90.0°F (1963) | 25.0°F (1926) | 0.69 in (1982) |
| September 27 | 89.1°F (1967) | 28.9°F (1935) | 0.60 in (2023) |
| September 28 | 90.0°F (2022) | 27.0°F (1985) | 0.38 in (1962) |
| September 29 | 89.1°F (1967) | 27.0°F (1950) | 0.77 in (2013) |
| September 30 | 86.0°F (1976) | 26.1°F (1950) | 1.04 in (2022) |