September weather in Williamsburg, IA
The average temperature in Williamsburg in September is 63.5°F (50.7°F–76.3°F). Average precipitation: 3.80 inches.
September is a fall month in Williamsburg, and is warmer than the annual average of 48.2°F. Daily temperatures swing about 25.6°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
76.3°F
Avg Low
50.7°F
Precipitation
3.80 in
Daylight
12h 16m
September records in Williamsburg
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1953) | 39.0°F (1967) | 2.09 in (2010) |
| September 2 | 98.1°F (1960) | 41.0°F (1955) | 0.94 in (1923) |
| September 3 | 99.0°F (1939) | 37.9°F (1952) | 1.56 in (1917) |
| September 4 | 98.1°F (1925) | 37.0°F (1974) | 3.12 in (1958) |
| September 5 | 98.1°F (1922) | 39.9°F (1962) | 1.85 in (1971) |
| September 6 | 102.0°F (1922) | 39.0°F (1962) | 2.88 in (2018) |
| September 7 | 100.9°F (1922) | 36.0°F (1956) | 4.97 in (1927) |
| September 8 | 100.9°F (1922) | 36.0°F (1986) | 3.45 in (1989) |
| September 9 | 102.9°F (1933) | 37.9°F (1924) | 2.00 in (1989) |
| September 10 | 100.0°F (2013) | 36.0°F (1976) | 3.55 in (2014) |
| September 11 | 98.1°F (1931) | 32.0°F (1917) | 1.00 in (2020) |
| September 12 | 96.1°F (2000) | 30.9°F (1955) | 2.22 in (1943) |
| September 13 | 97.0°F (1939) | 33.1°F (1953) | 4.25 in (1961) |
| September 14 | 99.0°F (1939) | 34.0°F (1996) | 3.15 in (1967) |
| September 15 | 100.0°F (1939) | 32.0°F (2011) | 2.45 in (1970) |
| September 16 | 93.0°F (1931) | 32.0°F (2007) | 2.83 in (1921) |
| September 17 | 91.9°F (1927) | 35.1°F (1916) | 2.26 in (1978) |
| September 18 | 96.1°F (2018) | 28.9°F (1929) | 1.13 in (1982) |
| September 19 | 93.9°F (1940) | 37.9°F (1938) | 1.86 in (1919) |
| September 20 | 96.1°F (1940) | 30.9°F (1956) | 2.14 in (1965) |
| September 21 | 97.0°F (2022) | 28.9°F (1918) | 2.23 in (1965) |
| September 22 | 96.1°F (1930) | 27.0°F (1953) | 3.42 in (1926) |
| September 23 | 91.9°F (1930) | 28.0°F (1995) | 2.30 in (2000) |
| September 24 | 93.9°F (2017) | 27.0°F (2012) | 1.45 in (2010) |
| September 25 | 90.0°F (1933) | 30.0°F (1928) | 4.09 in (1930) |
| September 26 | 90.0°F (2017) | 25.0°F (1928) | 3.01 in (1993) |
| September 27 | 89.1°F (1954) | 30.0°F (1918) | 1.60 in (1959) |
| September 28 | 97.0°F (1953) | 23.0°F (1926) | 1.14 in (1999) |
| September 29 | 93.0°F (1953) | 28.0°F (1984) | 1.67 in (1929) |
| September 30 | 91.0°F (1952) | 26.1°F (1924) | 3.15 in (1919) |