September weather in Polson, MT
The average temperature in Polson in September is 58.3°F (45.6°F–70.9°F). Average precipitation: 1.19 inches.
September is a fall month in Polson, and is warmer than the annual average of 46.2°F. Daily temperatures swing about 25.3°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
70.9°F
Avg Low
45.6°F
Precipitation
1.19 in
Daylight
12h 19m
September records in Polson
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.0°F (1988) | 28.9°F (1959) | 0.98 in (1910) |
| September 2 | 89.1°F (1955) | 36.0°F (1974) | 1.05 in (1961) |
| September 3 | 93.0°F (1931) | 37.0°F (1962) | 0.70 in (1916) |
| September 4 | 90.0°F (1988) | 35.1°F (1929) | 1.30 in (1911) |
| September 5 | 91.0°F (2003) | 34.0°F (1956) | 0.49 in (1945) |
| September 6 | 90.0°F (1934) | 34.0°F (1929) | 0.98 in (1985) |
| September 7 | 91.0°F (1944) | 30.9°F (1929) | 0.62 in (1941) |
| September 8 | 89.1°F (1944) | 33.1°F (1962) | 0.64 in (1914) |
| September 9 | 91.9°F (1981) | 32.0°F (1959) | 1.38 in (1986) |
| September 10 | 88.0°F (1939) | 34.0°F (1983) | 0.73 in (2005) |
| September 11 | 88.0°F (1973) | 30.0°F (2014) | 1.08 in (1951) |
| September 12 | 89.1°F (1953) | 32.0°F (1949) | 1.26 in (1985) |
| September 13 | 89.1°F (1937) | 28.9°F (2014) | 0.38 in (1931) |
| September 14 | 86.0°F (1935) | 28.9°F (1921) | 0.47 in (1991) |
| September 15 | 90.0°F (1988) | 32.0°F (1965) | 1.00 in (1959) |
| September 16 | 87.1°F (1979) | 30.0°F (1936) | 0.95 in (1947) |
| September 17 | 89.1°F (1937) | 27.0°F (1965) | 0.92 in (1946) |
| September 18 | 86.0°F (1984) | 30.0°F (1944) | 0.89 in (2013) |
| September 19 | 88.0°F (1906) | 28.9°F (1964) | 0.49 in (1972) |
| September 20 | 89.1°F (1938) | 23.0°F (1983) | 0.52 in (2006) |
| September 21 | 89.1°F (1936) | 28.9°F (1932) | 0.93 in (2008) |
| September 22 | 84.9°F (1917) | 32.0°F (1912) | 0.91 in (1945) |
| September 23 | 86.0°F (2011) | 23.0°F (2000) | 1.35 in (1930) |
| September 24 | 89.1°F (2014) | 16.0°F (1926) | 0.34 in (1937) |
| September 25 | 86.0°F (2014) | 19.0°F (1926) | 0.45 in (1959) |
| September 26 | 87.1°F (1952) | 25.0°F (1926) | 0.40 in (1982) |
| September 27 | 82.0°F (1963) | 28.9°F (1926) | 0.51 in (1959) |
| September 28 | 82.9°F (1994) | 23.0°F (1985) | 0.68 in (1982) |
| September 29 | 82.0°F (1976) | 21.9°F (1985) | 0.65 in (1977) |
| September 30 | 84.9°F (1963) | 23.0°F (1985) | 0.62 in (1918) |