September weather in Darby, MT
The average temperature in Darby in September is 56.4°F (41.5°F–71.4°F). Average precipitation: 1.23 inches.
September is a fall month in Darby, and is warmer than the annual average of 44.6°F. Daily temperatures swing about 29.9°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
71.4°F
Avg Low
41.5°F
Precipitation
1.23 in
Daylight
12h 18m
September records in Darby
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (1967) | 28.0°F (1914) | 1.02 in (1961) |
| September 2 | 98.1°F (1967) | 30.0°F (1914) | 0.83 in (1936) |
| September 3 | 98.1°F (1950) | 28.9°F (1958) | 0.85 in (1909) |
| September 4 | 93.9°F (1988) | 28.0°F (1956) | 0.80 in (1936) |
| September 5 | 95.0°F (2003) | 28.9°F (1956) | 0.85 in (2016) |
| September 6 | 91.9°F (1966) | 23.0°F (1993) | 0.78 in (1946) |
| September 7 | 93.0°F (1998) | 28.0°F (1939) | 0.49 in (1978) |
| September 8 | 93.0°F (1998) | 27.0°F (1960) | 1.05 in (1973) |
| September 9 | 90.0°F (1982) | 27.0°F (1945) | 1.25 in (1928) |
| September 10 | 91.0°F (1935) | 26.1°F (1983) | 0.75 in (2005) |
| September 11 | 90.0°F (1959) | 26.1°F (1950) | 0.70 in (1909) |
| September 12 | 93.9°F (1990) | 27.0°F (2016) | 1.12 in (2004) |
| September 13 | 89.1°F (1996) | 27.0°F (1961) | 0.76 in (1950) |
| September 14 | 89.1°F (1948) | 24.1°F (1982) | 0.56 in (1966) |
| September 15 | 91.0°F (2000) | 25.0°F (1970) | 0.92 in (1965) |
| September 16 | 93.9°F (2002) | 24.1°F (1936) | 0.75 in (1947) |
| September 17 | 93.0°F (2002) | 19.0°F (1965) | 0.77 in (1954) |
| September 18 | 95.0°F (1981) | 21.9°F (1965) | 0.78 in (1976) |
| September 19 | 96.1°F (1981) | 27.0°F (1964) | 0.90 in (1983) |
| September 20 | 87.1°F (1938) | 21.9°F (1983) | 0.94 in (1968) |
| September 21 | 91.0°F (1967) | 21.0°F (1971) | 1.16 in (1937) |
| September 22 | 91.9°F (1967) | 23.0°F (1993) | 0.83 in (2016) |
| September 23 | 87.1°F (1992) | 21.0°F (1985) | 0.62 in (1984) |
| September 24 | 93.0°F (2001) | 14.0°F (1926) | 0.58 in (1992) |
| September 25 | 93.0°F (2001) | 16.0°F (1926) | 0.68 in (1992) |
| September 26 | 90.0°F (2001) | 21.9°F (1972) | 0.51 in (1948) |
| September 27 | 89.1°F (1929) | 23.0°F (1935) | 0.91 in (1982) |
| September 28 | 90.0°F (1967) | 21.0°F (1999) | 1.43 in (1940) |
| September 29 | 90.0°F (1963) | 24.1°F (1953) | 0.64 in (1947) |
| September 30 | 90.0°F (1963) | 19.0°F (1985) | 0.55 in (1967) |