September weather in Libby, MT
The average temperature in Libby in September is 59.2°F (40.9°F–77.6°F). Average precipitation: 1.09 inches.
September is a fall month in Libby, and is warmer than the annual average of 47.4°F. Daily temperatures swing about 36.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 20m. For travel, September is a comfortable month to visit.
Avg High
77.6°F
Avg Low
40.9°F
Precipitation
1.09 in
Daylight
12h 20m
September records in Libby
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1998) | 28.0°F (1917) | 0.68 in (1912) |
| September 2 | 102.0°F (1998) | 27.0°F (1973) | 0.71 in (1980) |
| September 3 | 102.0°F (1950) | 24.1°F (1962) | 0.80 in (1916) |
| September 4 | 105.1°F (1998) | 26.1°F (1962) | 0.70 in (1936) |
| September 5 | 102.9°F (1998) | 28.0°F (1956) | 1.02 in (1940) |
| September 6 | 102.9°F (1998) | 25.0°F (1929) | 0.80 in (1985) |
| September 7 | 105.1°F (1998) | 24.1°F (1895) | 1.50 in (2001) |
| September 8 | 98.1°F (1958) | 24.1°F (1943) | 0.80 in (1921) |
| September 9 | 95.0°F (1994) | 26.1°F (1943) | 0.55 in (1915) |
| September 10 | 95.0°F (1958) | 19.9°F (1895) | 1.00 in (1927) |
| September 11 | 96.1°F (1958) | 25.0°F (1913) | 0.62 in (1949) |
| September 12 | 96.1°F (2011) | 19.0°F (1970) | 0.71 in (1985) |
| September 13 | 95.0°F (2011) | 18.0°F (1970) | 0.42 in (1920) |
| September 14 | 96.1°F (2013) | 17.1°F (1970) | 0.50 in (1959) |
| September 15 | 95.0°F (1998) | 21.0°F (1970) | 1.76 in (1959) |
| September 16 | 99.0°F (1998) | 19.9°F (1973) | 0.87 in (1947) |
| September 17 | 97.0°F (2009) | 21.9°F (1971) | 0.58 in (1926) |
| September 18 | 96.1°F (1938) | 24.1°F (1945) | 0.91 in (1985) |
| September 19 | 93.9°F (1981) | 21.9°F (1943) | 0.34 in (2011) |
| September 20 | 93.9°F (1967) | 23.0°F (1912) | 0.77 in (2006) |
| September 21 | 95.0°F (1967) | 23.0°F (1912) | 0.65 in (1961) |
| September 22 | 95.0°F (1967) | 21.9°F (1932) | 0.89 in (1945) |
| September 23 | 91.9°F (1999) | 18.0°F (2000) | 0.35 in (2007) |
| September 24 | 91.9°F (1994) | 12.9°F (1926) | 0.84 in (1917) |
| September 25 | 93.0°F (1994) | 16.0°F (1934) | 0.63 in (1951) |
| September 26 | 93.9°F (1952) | 19.9°F (1926) | 0.48 in (1982) |
| September 27 | 90.0°F (1994) | 21.9°F (1926) | 0.33 in (1919) |
| September 28 | 91.9°F (1967) | 19.9°F (1912) | 0.68 in (1954) |
| September 29 | 91.9°F (1967) | 19.0°F (1985) | 0.30 in (2013) |
| September 30 | 87.1°F (1935) | 16.0°F (1946) | 0.69 in (1995) |