September weather in Lima, MT
The average temperature in Lima in September is 55.0°F (38.7°F–71.3°F). Average precipitation: 0.92 inches. Average snowfall is 0.6 inches.
September is a fall month in Lima, and is warmer than the annual average of 41.5°F. Daily temperatures swing about 32.6°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
71.3°F
Avg Low
38.7°F
Precipitation
0.92 in
Snow
0.6 in
September records in Lima
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 89.1°F (1950) | 27.0°F (1946) | 0.96 in (1973) |
| September 2 | 91.0°F (1950) | 23.0°F (1942) | 0.75 in (2007) |
| September 3 | 91.9°F (1950) | 24.1°F (1964) | 1.28 in (1971) |
| September 4 | 93.0°F (2017) | 23.0°F (1965) | 0.40 in (1992) |
| September 5 | 90.0°F (1955) | 23.0°F (1956) | 0.93 in (1990) |
| September 6 | 93.0°F (2020) | 21.9°F (1996) | 0.43 in (1978) |
| September 7 | 91.0°F (1955) | 21.0°F (1992) | 0.58 in (1940) |
| September 8 | 87.1°F (1969) | 23.0°F (1976) | 0.40 in (1961) |
| September 9 | 89.1°F (2021) | 19.9°F (1959) | 0.84 in (1950) |
| September 10 | 91.9°F (2021) | 23.0°F (1946) | 0.27 in (1985) |
| September 11 | 84.9°F (1953) | 24.1°F (1964) | 1.11 in (1997) |
| September 12 | 87.1°F (1953) | 18.0°F (1951) | 0.67 in (1985) |
| September 13 | 84.9°F (1948) | 9.0°F (1914) | 0.68 in (1939) |
| September 14 | 84.9°F (1938) | 19.0°F (1915) | 0.71 in (1939) |
| September 15 | 87.1°F (1946) | 16.0°F (1936) | 0.85 in (2017) |
| September 16 | 84.0°F (1943) | 17.1°F (1936) | 0.40 in (1996) |
| September 17 | 84.9°F (1943) | 15.1°F (1965) | 0.47 in (1989) |
| September 18 | 84.9°F (1937) | 8.1°F (1965) | 0.78 in (1961) |
| September 19 | 87.1°F (2009) | 14.0°F (1965) | 0.44 in (1948) |
| September 20 | 88.0°F (1932) | 9.0°F (1983) | 1.22 in (1968) |
| September 21 | 82.9°F (1936) | 14.0°F (1995) | 0.53 in (1977) |
| September 22 | 86.0°F (1953) | 17.1°F (1993) | 0.70 in (2023) |
| September 23 | 87.1°F (1987) | 10.0°F (1946) | 0.72 in (2017) |
| September 24 | 84.9°F (1987) | 14.0°F (1934) | 0.34 in (1948) |
| September 25 | 82.9°F (2009) | 15.1°F (1984) | 0.40 in (1973) |
| September 26 | 82.9°F (1952) | 21.0°F (1942) | 0.61 in (1915) |
| September 27 | 82.0°F (2010) | 10.9°F (1946) | 0.55 in (1983) |
| September 28 | 84.0°F (1967) | 12.9°F (1999) | 0.82 in (1940) |
| September 29 | 84.0°F (2010) | 6.1°F (1985) | 0.21 in (1995) |
| September 30 | 82.9°F (2024) | 12.9°F (1985) | 0.69 in (1949) |