September weather in St. Francis, WI
The average temperature in St. Francis in September is 65.0°F (56.4°F–73.5°F). Average precipitation: 3.16 inches.
September is a fall month in St. Francis, and is warmer than the annual average of 49.3°F. Daily temperatures swing about 17.1°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
73.5°F
Avg Low
56.4°F
Precipitation
3.16 in
Daylight
12h 17m
September records in St. Francis
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1953) | 43.0°F (1949) | 0.69 in (1984) |
| September 2 | 96.1°F (1953) | 43.0°F (1946) | 1.34 in (2002) |
| September 3 | 95.0°F (1939) | 44.1°F (1974) | 1.08 in (1991) |
| September 4 | 93.0°F (2023) | 41.0°F (1974) | 1.96 in (2008) |
| September 5 | 91.0°F (1945) | 43.0°F (1962) | 1.57 in (1947) |
| September 6 | 96.1°F (1990) | 41.0°F (1962) | 1.44 in (1970) |
| September 7 | 97.0°F (1939) | 41.0°F (1956) | 1.87 in (1938) |
| September 8 | 91.9°F (1971) | 43.0°F (1957) | 4.32 in (1941) |
| September 9 | 96.1°F (1955) | 43.0°F (1975) | 1.90 in (1965) |
| September 10 | 95.0°F (2013) | 41.0°F (1943) | 1.74 in (1986) |
| September 11 | 91.9°F (2005) | 37.9°F (1943) | 4.78 in (2022) |
| September 12 | 91.9°F (1948) | 39.9°F (1975) | 1.58 in (2019) |
| September 13 | 93.9°F (1939) | 37.0°F (1964) | 2.52 in (1961) |
| September 14 | 96.1°F (1939) | 39.9°F (1949) | 1.16 in (1998) |
| September 15 | 97.0°F (1939) | 39.9°F (2007) | 0.86 in (1970) |
| September 16 | 91.0°F (1948) | 42.1°F (1966) | 1.08 in (1997) |
| September 17 | 91.0°F (1955) | 39.9°F (1943) | 1.15 in (1978) |
| September 18 | 91.9°F (1955) | 39.0°F (1956) | 1.80 in (1938) |
| September 19 | 90.0°F (1947) | 35.1°F (1956) | 1.44 in (1997) |
| September 20 | 87.1°F (1940) | 30.0°F (1956) | 2.13 in (2018) |
| September 21 | 88.0°F (1941) | 33.1°F (1962) | 2.71 in (1947) |
| September 22 | 95.0°F (2017) | 32.0°F (1974) | 2.40 in (1988) |
| September 23 | 91.0°F (2017) | 28.0°F (1974) | 1.19 in (1970) |
| September 24 | 91.0°F (2017) | 32.0°F (1942) | 1.20 in (1958) |
| September 25 | 87.1°F (2017) | 28.9°F (1942) | 2.31 in (2005) |
| September 26 | 91.0°F (2017) | 35.1°F (1942) | 1.33 in (1996) |
| September 27 | 86.0°F (1946) | 30.9°F (1942) | 2.24 in (1999) |
| September 28 | 88.0°F (1952) | 28.0°F (1942) | 1.56 in (1973) |
| September 29 | 91.0°F (1953) | 30.9°F (1942) | 1.10 in (2019) |
| September 30 | 88.0°F (1971) | 35.1°F (1947) | 1.29 in (1941) |