September weather in Colstrip, MT
The average temperature in Colstrip in September is 59.6°F (45.8°F–73.4°F). Average precipitation: 1.43 inches. Average snowfall is 0.2 inches.
September is a fall month in Colstrip, and is warmer than the annual average of 46.1°F. Daily temperatures swing about 27.6°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
73.4°F
Avg Low
45.8°F
Precipitation
1.43 in
Snow
0.2 in
September records in Colstrip
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1940) | 33.1°F (1930) | 0.81 in (1963) |
| September 2 | 97.0°F (1940) | 33.1°F (1961) | 0.87 in (1953) |
| September 3 | 99.0°F (1939) | 30.0°F (1961) | 0.60 in (1951) |
| September 4 | 102.0°F (1950) | 25.0°F (1962) | 0.96 in (1938) |
| September 5 | 100.0°F (1960) | 30.0°F (1962) | 0.94 in (2016) |
| September 6 | 98.1°F (2020) | 32.0°F (1956) | 0.56 in (2010) |
| September 7 | 98.1°F (1947) | 25.0°F (1929) | 1.40 in (1941) |
| September 8 | 105.1°F (2022) | 25.0°F (1929) | 1.72 in (1946) |
| September 9 | 97.0°F (2024) | 30.0°F (1929) | 0.35 in (1970) |
| September 10 | 97.0°F (2024) | 24.1°F (1989) | 1.25 in (1961) |
| September 11 | 96.1°F (1959) | 25.0°F (1989) | 0.69 in (2008) |
| September 12 | 97.0°F (1958) | 28.9°F (1964) | 2.41 in (2019) |
| September 13 | 99.0°F (1959) | 28.9°F (1949) | 1.38 in (1967) |
| September 14 | 99.0°F (1948) | 28.0°F (1970) | 2.20 in (1991) |
| September 15 | 98.1°F (1948) | 27.0°F (1951) | 0.70 in (2017) |
| September 16 | 95.0°F (2000) | 24.1°F (1936) | 1.43 in (1945) |
| September 17 | 95.0°F (1943) | 23.0°F (1991) | 1.00 in (1946) |
| September 18 | 91.9°F (1928) | 19.9°F (1965) | 0.91 in (1978) |
| September 19 | 99.0°F (1937) | 23.0°F (1943) | 0.79 in (1940) |
| September 20 | 93.0°F (1966) | 21.0°F (1995) | 0.58 in (2018) |
| September 21 | 93.9°F (1936) | 27.0°F (1953) | 0.82 in (2000) |
| September 22 | 93.9°F (1938) | 25.0°F (1955) | 1.51 in (2023) |
| September 23 | 95.0°F (1992) | 9.0°F (1984) | 1.25 in (2006) |
| September 24 | 96.1°F (1938) | 6.1°F (1984) | 1.65 in (1986) |
| September 25 | 89.1°F (1938) | 5.0°F (1984) | 1.92 in (2016) |
| September 26 | 91.0°F (1952) | 14.0°F (1984) | 0.48 in (2013) |
| September 27 | 91.9°F (2010) | 7.0°F (1984) | 1.09 in (1941) |
| September 28 | 93.9°F (2001) | 21.0°F (1985) | 0.31 in (2018) |
| September 29 | 95.0°F (2024) | 21.9°F (1941) | 1.71 in (2019) |
| September 30 | 93.0°F (1963) | 19.9°F (1958) | 0.57 in (1950) |