September weather in Thompson Falls, MT
The average temperature in Thompson Falls in September is 59.8°F (44.3°F–75.4°F). Average precipitation: 0.97 inches.
September is a fall month in Thompson Falls, and is warmer than the annual average of 47.7°F. Daily temperatures swing about 31.1°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
75.4°F
Avg Low
44.3°F
Precipitation
0.97 in
Daylight
12h 19m
September records in Thompson Falls
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1967) | 34.0°F (1999) | 0.38 in (1986) |
| September 2 | 102.9°F (1988) | 33.1°F (1999) | 0.76 in (1968) |
| September 3 | 99.0°F (1988) | 33.1°F (1956) | 0.12 in (1997) |
| September 4 | 102.0°F (1988) | 33.1°F (1962) | 0.34 in (1960) |
| September 5 | 105.1°F (1988) | 34.0°F (1956) | 0.82 in (1959) |
| September 6 | 100.0°F (1998) | 33.1°F (1956) | 0.66 in (1959) |
| September 7 | 99.0°F (1998) | 32.0°F (1992) | 0.54 in (1978) |
| September 8 | 93.9°F (1958) | 28.0°F (1962) | 0.89 in (1995) |
| September 9 | 93.9°F (1981) | 28.0°F (1962) | 0.69 in (1991) |
| September 10 | 95.0°F (1987) | 33.1°F (1970) | 0.24 in (2000) |
| September 11 | 97.0°F (1958) | 32.0°F (1964) | 0.38 in (2024) |
| September 12 | 95.0°F (1987) | 30.0°F (1988) | 0.64 in (2024) |
| September 13 | 93.9°F (2013) | 28.0°F (1970) | 0.64 in (1980) |
| September 14 | 95.0°F (1988) | 24.1°F (1970) | 0.45 in (1968) |
| September 15 | 96.1°F (1998) | 26.1°F (1970) | 0.96 in (1965) |
| September 16 | 95.0°F (1981) | 27.0°F (1965) | 0.29 in (1968) |
| September 17 | 97.0°F (1981) | 23.0°F (1987) | 0.73 in (1989) |
| September 18 | 97.0°F (1981) | 27.0°F (1971) | 1.21 in (1986) |
| September 19 | 95.0°F (1981) | 28.0°F (1957) | 0.39 in (2011) |
| September 20 | 91.0°F (1994) | 25.0°F (1983) | 0.67 in (1964) |
| September 21 | 93.9°F (1967) | 27.0°F (1971) | 0.66 in (2008) |
| September 22 | 93.9°F (1987) | 28.0°F (1983) | 1.04 in (2022) |
| September 23 | 95.0°F (1987) | 21.9°F (2000) | 0.41 in (1961) |
| September 24 | 95.0°F (1987) | 25.0°F (2000) | 0.46 in (1992) |
| September 25 | 93.9°F (2011) | 26.1°F (1970) | 0.50 in (1959) |
| September 26 | 91.9°F (1994) | 28.9°F (1970) | 0.46 in (1982) |
| September 27 | 91.0°F (1994) | 24.1°F (1961) | 0.40 in (1988) |
| September 28 | 90.0°F (1967) | 21.0°F (1985) | 0.65 in (1982) |
| September 29 | 89.1°F (1994) | 19.9°F (1985) | 0.55 in (1977) |
| September 30 | 88.0°F (1987) | 23.0°F (1985) | 0.81 in (2005) |