September weather in Onawa, IA
The average temperature in Onawa in September is 64.2°F (50.3°F–78.1°F). Average precipitation: 2.97 inches.
September is a fall month in Onawa, and is warmer than the annual average of 48.5°F. Daily temperatures swing about 27.8°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 16m. For travel, September is one of the best months of the year to visit.
Avg High
78.1°F
Avg Low
50.3°F
Precipitation
2.97 in
Daylight
12h 16m
September records in Onawa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1913) | 35.1°F (1949) | 0.79 in (1982) |
| September 2 | 102.9°F (2000) | 42.1°F (1952) | 1.30 in (1936) |
| September 3 | 102.9°F (2000) | 35.1°F (1974) | 0.85 in (1968) |
| September 4 | 100.0°F (1913) | 42.1°F (1914) | 2.26 in (1994) |
| September 5 | 100.9°F (1913) | 39.9°F (1962) | 1.41 in (1936) |
| September 6 | 104.0°F (1939) | 37.0°F (1956) | 5.20 in (1938) |
| September 7 | 100.0°F (1931) | 37.9°F (1944) | 1.57 in (1965) |
| September 8 | 102.0°F (1947) | 37.0°F (1995) | 2.60 in (1989) |
| September 9 | 99.0°F (1955) | 33.1°F (1943) | 1.78 in (1951) |
| September 10 | 97.0°F (1931) | 37.0°F (1959) | 1.90 in (2007) |
| September 11 | 98.1°F (1939) | 30.0°F (1955) | 4.65 in (1900) |
| September 12 | 98.1°F (1939) | 33.1°F (1902) | 2.57 in (1982) |
| September 13 | 100.9°F (1939) | 33.1°F (1902) | 3.06 in (1978) |
| September 14 | 100.9°F (1939) | 36.0°F (1923) | 1.25 in (1914) |
| September 15 | 100.9°F (1939) | 30.0°F (2011) | 1.33 in (2001) |
| September 16 | 98.1°F (1955) | 30.9°F (2011) | 0.99 in (1968) |
| September 17 | 96.1°F (1955) | 33.1°F (1943) | 0.57 in (2006) |
| September 18 | 95.0°F (1947) | 32.0°F (1918) | 1.62 in (1995) |
| September 19 | 98.1°F (1920) | 28.0°F (1991) | 1.96 in (1931) |
| September 20 | 91.9°F (1970) | 26.1°F (1918) | 1.80 in (1923) |
| September 21 | 95.0°F (1937) | 30.0°F (1918) | 1.22 in (1955) |
| September 22 | 98.1°F (2005) | 27.0°F (1995) | 1.50 in (2006) |
| September 23 | 93.9°F (1938) | 28.9°F (2011) | 1.32 in (1994) |
| September 24 | 89.1°F (1956) | 28.0°F (1942) | 2.05 in (2010) |
| September 25 | 93.0°F (1920) | 28.0°F (1926) | 1.40 in (1931) |
| September 26 | 93.9°F (1956) | 27.0°F (1984) | 6.98 in (1915) |
| September 27 | 93.9°F (1956) | 26.1°F (1942) | 0.62 in (1965) |
| September 28 | 95.0°F (1953) | 23.0°F (1942) | 3.52 in (1988) |
| September 29 | 91.0°F (1981) | 23.0°F (1899) | 0.95 in (1923) |
| September 30 | 93.0°F (1952) | 25.0°F (1920) | 1.23 in (1965) |