September weather in Cass Lake, MN
The average temperature in Cass Lake in September is 57.4°F (46.9°F–68.0°F). Average precipitation: 2.91 inches.
September is a fall month in Cass Lake, and is warmer than the annual average of 39.9°F. Daily temperatures swing about 21.1°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
68.0°F
Avg Low
46.9°F
Precipitation
2.91 in
Daylight
12h 19m
September records in Cass Lake
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.0°F (1990) | 32.0°F (1974) | 1.31 in (1981) |
| September 2 | 91.9°F (1983) | 32.0°F (1974) | 2.10 in (1973) |
| September 3 | 98.1°F (1983) | 30.9°F (1974) | 0.83 in (1986) |
| September 4 | 93.9°F (2023) | 28.9°F (1961) | 2.79 in (2004) |
| September 5 | 91.0°F (1970) | 30.0°F (1984) | 0.74 in (1999) |
| September 6 | 91.9°F (1970) | 30.9°F (1988) | 1.00 in (2015) |
| September 7 | 93.9°F (1978) | 30.0°F (1956) | 1.70 in (2010) |
| September 8 | 93.9°F (1976) | 26.1°F (1956) | 0.54 in (2016) |
| September 9 | 87.1°F (1980) | 30.0°F (2020) | 1.35 in (2009) |
| September 10 | 88.0°F (2005) | 30.9°F (1988) | 2.44 in (1961) |
| September 11 | 88.0°F (1952) | 28.0°F (1955) | 0.97 in (1951) |
| September 12 | 89.1°F (1976) | 28.9°F (1955) | 1.18 in (1978) |
| September 13 | 86.0°F (1969) | 27.0°F (1975) | 1.19 in (2019) |
| September 14 | 82.9°F (2024) | 28.9°F (1996) | 1.06 in (1991) |
| September 15 | 81.0°F (1969) | 26.1°F (1964) | 2.07 in (2004) |
| September 16 | 82.9°F (2024) | 26.1°F (1982) | 2.00 in (1906) |
| September 17 | 89.1°F (2018) | 23.0°F (1959) | 1.11 in (1968) |
| September 18 | 86.0°F (2024) | 27.0°F (2020) | 4.07 in (1950) |
| September 19 | 90.0°F (2000) | 28.0°F (1979) | 2.15 in (1988) |
| September 20 | 91.0°F (1984) | 19.9°F (1973) | 1.57 in (2004) |
| September 21 | 84.0°F (2023) | 21.9°F (1973) | 1.51 in (2018) |
| September 22 | 84.0°F (2015) | 17.1°F (1974) | 0.95 in (1973) |
| September 23 | 82.0°F (2020) | 21.9°F (1983) | 1.35 in (1964) |
| September 24 | 84.9°F (1958) | 24.1°F (1951) | 1.94 in (2010) |
| September 25 | 82.0°F (1990) | 23.0°F (1982) | 0.79 in (2007) |
| September 26 | 82.0°F (2024) | 17.1°F (1965) | 1.54 in (1908) |
| September 27 | 82.0°F (1963) | 24.1°F (1967) | 0.82 in (1955) |
| September 28 | 84.9°F (2014) | 19.9°F (1961) | 0.50 in (1997) |
| September 29 | 86.0°F (2024) | 21.0°F (1984) | 0.75 in (1971) |
| September 30 | 84.0°F (2025) | 24.1°F (1984) | 1.82 in (1995) |