September weather in St. Peter, MN
The average temperature in St. Peter in September is 60.4°F (48.7°F–72.2°F). Average precipitation: 3.16 inches.
September is a fall month in St. Peter, and is warmer than the annual average of 43.9°F. Daily temperatures swing about 23.5°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
72.2°F
Avg Low
48.7°F
Precipitation
3.16 in
Daylight
12h 17m
September records in St. Peter
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1913) | 37.0°F (1949) | 2.12 in (1942) |
| September 2 | 100.9°F (1925) | 39.0°F (1893) | 1.73 in (1903) |
| September 3 | 100.9°F (1925) | 32.0°F (1974) | 0.89 in (1970) |
| September 4 | 100.9°F (1925) | 35.1°F (1974) | 1.33 in (1929) |
| September 5 | 100.9°F (1922) | 36.0°F (1909) | 1.92 in (1925) |
| September 6 | 102.9°F (1922) | 34.0°F (1993) | 1.71 in (2015) |
| September 7 | 100.0°F (1922) | 34.0°F (1956) | 1.89 in (1930) |
| September 8 | 100.9°F (1931) | 39.0°F (2025) | 2.76 in (1964) |
| September 9 | 99.0°F (1931) | 30.0°F (1898) | 2.65 in (1901) |
| September 10 | 102.9°F (1931) | 33.1°F (1896) | 2.90 in (1986) |
| September 11 | 97.0°F (1931) | 30.0°F (1896) | 3.25 in (1900) |
| September 12 | 95.0°F (1908) | 32.0°F (2022) | 3.67 in (1903) |
| September 13 | 98.1°F (1939) | 27.0°F (1902) | 1.90 in (1896) |
| September 14 | 100.0°F (1939) | 32.0°F (1923) | 3.76 in (1991) |
| September 15 | 100.0°F (1939) | 32.0°F (2007) | 1.57 in (1903) |
| September 16 | 96.1°F (1955) | 32.0°F (1937) | 1.52 in (2010) |
| September 17 | 97.0°F (1895) | 30.0°F (1916) | 3.75 in (1926) |
| September 18 | 93.9°F (1988) | 26.1°F (1929) | 1.45 in (2015) |
| September 19 | 93.9°F (1925) | 30.9°F (1918) | 1.58 in (1905) |
| September 20 | 93.0°F (1908) | 30.0°F (1918) | 2.85 in (1948) |
| September 21 | 96.1°F (1937) | 26.1°F (1913) | 3.57 in (1895) |
| September 22 | 95.0°F (1936) | 24.1°F (1913) | 4.55 in (2016) |
| September 23 | 97.0°F (1937) | 27.0°F (1974) | 3.15 in (2010) |
| September 24 | 90.0°F (1935) | 27.0°F (1989) | 1.72 in (2023) |
| September 25 | 90.0°F (1920) | 28.0°F (1893) | 2.05 in (2005) |
| September 26 | 89.1°F (1923) | 24.1°F (1939) | 3.00 in (1929) |
| September 27 | 91.0°F (1956) | 27.0°F (1893) | 0.60 in (1947) |
| September 28 | 89.1°F (1894) | 23.0°F (1942) | 3.65 in (1901) |
| September 29 | 88.0°F (1922) | 24.1°F (1945) | 1.80 in (1925) |
| September 30 | 86.0°F (2021) | 21.0°F (1939) | 1.30 in (1965) |