September weather in Merrillan, WI
The average temperature in Merrillan in September is °F (°F–°F). Average precipitation: 3.89 inches.
September is a fall month in Merrillan, and is cooler than the annual average of 0°F. Expect about 9 days with precipitation. Daylight averages about 12h 17m.
Avg High
°F
Avg Low
°F
Precipitation
3.89 in
Daylight
12h 17m
September records in Merrillan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1894) | 30.0°F (1895) | 1.07 in (1997) |
| September 2 | 98.1°F (1937) | 30.0°F (1893) | 2.28 in (2002) |
| September 3 | 95.0°F (1895) | 32.0°F (1893) | 1.24 in (1934) |
| September 4 | 95.0°F (1893) | 43.0°F (1893) | 0.99 in (1949) |
| September 5 | 95.0°F (1893) | 39.0°F (1935) | 2.30 in (2018) |
| September 6 | 95.0°F (1893) | 35.1°F (1935) | 0.92 in (1938) |
| September 7 | 95.0°F (1939) | 39.9°F (1895) | 2.83 in (2015) |
| September 8 | 90.0°F (1933) | 41.0°F (1895) | 2.45 in (2001) |
| September 9 | 96.1°F (1933) | 39.9°F (1934) | 0.92 in (1951) |
| September 10 | 93.9°F (1895) | 39.0°F (1940) | 1.21 in (2019) |
| September 11 | 87.1°F (1893) | 30.0°F (1894) | 1.02 in (2006) |
| September 12 | 90.0°F (1895) | 30.0°F (1894) | 0.75 in (1939) |
| September 13 | 93.9°F (1939) | 36.0°F (1937) | 1.67 in (2025) |
| September 14 | 95.0°F (1939) | 44.1°F (1937) | 1.82 in (1993) |
| September 15 | 95.0°F (1939) | 34.0°F (1940) | 3.54 in (2004) |
| September 16 | 84.9°F (1939) | 37.0°F (1940) | 2.07 in (1997) |
| September 17 | 80.1°F (1895) | 28.9°F (1893) | 0.74 in (1905) |
| September 18 | 89.1°F (1893) | 24.1°F (1894) | 1.69 in (2018) |
| September 19 | 93.0°F (1895) | 30.9°F (1937) | 1.45 in (1935) |
| September 20 | 91.0°F (1940) | 30.0°F (1937) | 1.44 in (2025) |
| September 21 | 88.0°F (1936) | 15.1°F (1936) | 1.23 in (2018) |
| September 22 | 93.9°F (1937) | 33.1°F (1933) | 1.49 in (2016) |
| September 23 | 93.0°F (1937) | 39.0°F (1893) | 4.72 in (2010) |
| September 24 | 82.9°F (1933) | 25.0°F (1893) | 2.29 in (2010) |
| September 25 | 82.9°F (1935) | 23.0°F (1894) | 1.57 in (2005) |
| September 26 | 82.0°F (1933) | 21.9°F (1893) | 2.41 in (1934) |
| September 27 | 87.1°F (1894) | 21.9°F (1893) | 1.82 in (1908) |
| September 28 | 89.1°F (1894) | 36.0°F (1935) | 0.42 in (1998) |
| September 29 | 84.9°F (1894) | 28.9°F (1937) | 0.60 in (1939) |
| September 30 | 72.0°F (1938) | 28.9°F (1936) | 1.50 in (1893) |