September weather in Chelsea, SD
The average temperature in Chelsea in September is 59.5°F (45.1°F–73.8°F). Average precipitation: 2.35 inches.
September is a fall month in Chelsea, and is warmer than the annual average of 42.8°F. Daily temperatures swing about 28.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 18m. For travel, September is a comfortable month to visit.
Avg High
73.8°F
Avg Low
45.1°F
Precipitation
2.35 in
Daylight
12h 18m
September records in Chelsea
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (1898) | 34.0°F (1946) | 2.26 in (1904) |
| September 2 | 105.1°F (1983) | 36.0°F (1917) | 5.50 in (1926) |
| September 3 | 102.0°F (1897) | 28.9°F (1974) | 1.18 in (1999) |
| September 4 | 100.0°F (1913) | 30.9°F (1905) | 1.97 in (1971) |
| September 5 | 104.0°F (1913) | 32.0°F (1962) | 1.10 in (1987) |
| September 6 | 100.9°F (1970) | 30.9°F (1956) | 1.19 in (1911) |
| September 7 | 104.0°F (1976) | 27.0°F (1895) | 1.35 in (2010) |
| September 8 | 102.0°F (1931) | 26.1°F (1898) | 0.85 in (1921) |
| September 9 | 104.0°F (1931) | 25.0°F (1898) | 3.63 in (1991) |
| September 10 | 106.0°F (1931) | 27.0°F (1959) | 1.54 in (1933) |
| September 11 | 98.1°F (1931) | 28.9°F (1940) | 1.42 in (1901) |
| September 12 | 100.0°F (1939) | 24.1°F (1902) | 1.20 in (1906) |
| September 13 | 96.1°F (1927) | 28.0°F (1902) | 1.73 in (1914) |
| September 14 | 102.0°F (1948) | 28.9°F (1949) | 3.57 in (1900) |
| September 15 | 100.9°F (1955) | 26.1°F (1916) | 1.26 in (2010) |
| September 16 | 97.0°F (1925) | 27.0°F (1903) | 1.25 in (1968) |
| September 17 | 98.1°F (1895) | 24.1°F (1981) | 0.92 in (1923) |
| September 18 | 97.0°F (1933) | 23.0°F (1929) | 2.28 in (1967) |
| September 19 | 102.0°F (1895) | 25.0°F (1991) | 1.77 in (1996) |
| September 20 | 93.9°F (1898) | 24.1°F (1918) | 1.84 in (1996) |
| September 21 | 98.1°F (1937) | 21.9°F (1934) | 2.12 in (1989) |
| September 22 | 100.0°F (1936) | 19.9°F (1947) | 1.40 in (1959) |
| September 23 | 95.0°F (1935) | 19.9°F (1995) | 0.50 in (2006) |
| September 24 | 91.0°F (2007) | 21.9°F (1942) | 1.62 in (1977) |
| September 25 | 96.1°F (1938) | 17.1°F (1926) | 0.58 in (1927) |
| September 26 | 91.0°F (1904) | 18.0°F (1939) | 1.36 in (1996) |
| September 27 | 97.0°F (1952) | 19.9°F (1935) | 0.50 in (1944) |
| September 28 | 95.0°F (1905) | 18.0°F (1951) | 1.33 in (1988) |
| September 29 | 95.0°F (1897) | 16.0°F (1899) | 0.78 in (1927) |
| September 30 | 87.1°F (2000) | 16.0°F (1939) | 0.95 in (1995) |