September weather in Big Timber, MT
The average temperature in Big Timber in September is 58.8°F (43.4°F–74.1°F). Average precipitation: 1.31 inches. Average snowfall is 0.5 inches.
September is a fall month in Big Timber, and is warmer than the annual average of 47°F. Daily temperatures swing about 30.7°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
74.1°F
Avg Low
43.4°F
Precipitation
1.31 in
Snow
0.5 in
September records in Big Timber
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1983) | 30.9°F (1930) | 0.90 in (1973) |
| September 2 | 96.1°F (1983) | 32.0°F (1914) | 1.50 in (1944) |
| September 3 | 98.1°F (1925) | 30.9°F (1956) | 0.62 in (1949) |
| September 4 | 100.0°F (1950) | 28.0°F (1962) | 0.54 in (2016) |
| September 5 | 98.1°F (1931) | 32.0°F (1918) | 0.90 in (2010) |
| September 6 | 95.0°F (1988) | 32.0°F (1921) | 0.86 in (1997) |
| September 7 | 100.0°F (1931) | 32.0°F (1992) | 1.00 in (1941) |
| September 8 | 93.9°F (1958) | 19.9°F (1929) | 1.75 in (1926) |
| September 9 | 93.0°F (1981) | 25.0°F (1962) | 0.60 in (1918) |
| September 10 | 95.0°F (1930) | 30.0°F (1921) | 1.18 in (2008) |
| September 11 | 96.1°F (1959) | 21.9°F (1989) | 1.20 in (2019) |
| September 12 | 91.9°F (1981) | 24.1°F (1989) | 0.60 in (1914) |
| September 13 | 91.9°F (1948) | 26.1°F (1970) | 0.52 in (1936) |
| September 14 | 95.0°F (1948) | 21.9°F (1970) | 1.47 in (1918) |
| September 15 | 91.9°F (1948) | 21.9°F (1970) | 1.55 in (2017) |
| September 16 | 96.1°F (2000) | 28.0°F (1912) | 0.82 in (2006) |
| September 17 | 91.9°F (1920) | 21.9°F (1965) | 1.00 in (1942) |
| September 18 | 91.0°F (1981) | 23.0°F (1965) | 0.90 in (1978) |
| September 19 | 91.9°F (1938) | 25.0°F (1943) | 1.45 in (1931) |
| September 20 | 90.0°F (1938) | 24.1°F (1983) | 0.95 in (2019) |
| September 21 | 91.9°F (1938) | 21.0°F (1972) | 1.09 in (1955) |
| September 22 | 90.0°F (1938) | 24.1°F (2000) | 1.15 in (2017) |
| September 23 | 90.0°F (1987) | 19.9°F (1934) | 0.82 in (1937) |
| September 24 | 88.0°F (1938) | 12.0°F (1926) | 1.83 in (2025) |
| September 25 | 91.9°F (2015) | 18.0°F (1926) | 0.98 in (1910) |
| September 26 | 90.0°F (1922) | 21.0°F (1926) | 0.78 in (2013) |
| September 27 | 87.1°F (1963) | 18.0°F (1972) | 1.25 in (1941) |
| September 28 | 88.0°F (1938) | 24.1°F (1985) | 0.70 in (1940) |
| September 29 | 91.0°F (2024) | 21.9°F (1912) | 0.65 in (1954) |
| September 30 | 89.1°F (1963) | 16.0°F (1985) | 1.15 in (1926) |