September weather in Friendship, WI
The average temperature in Friendship in September is 60.5°F (48.4°F–72.7°F). Average precipitation: 3.49 inches.
September is a fall month in Friendship, and is warmer than the annual average of 45°F. Daily temperatures swing about 24.3°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
72.7°F
Avg Low
48.4°F
Precipitation
3.49 in
Daylight
12h 17m
September records in Friendship
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (1937) | 39.0°F (2009) | 1.14 in (2010) |
| September 2 | 95.0°F (1937) | 41.0°F (2003) | 1.17 in (2002) |
| September 3 | 93.9°F (2023) | 39.9°F (2013) | 1.81 in (2011) |
| September 4 | 98.1°F (2023) | 36.0°F (2025) | 3.52 in (2018) |
| September 5 | 95.0°F (2023) | 37.0°F (2025) | 1.05 in (2018) |
| September 6 | 90.0°F (2007) | 36.0°F (1935) | 0.26 in (2024) |
| September 7 | 93.9°F (1939) | 34.0°F (1935) | 2.26 in (2016) |
| September 8 | 96.1°F (1933) | 37.0°F (2024) | 0.53 in (2005) |
| September 9 | 93.0°F (1931) | 36.0°F (2008) | 1.23 in (2015) |
| September 10 | 91.9°F (1931) | 35.1°F (1935) | 2.30 in (1933) |
| September 11 | 98.1°F (1931) | 30.0°F (1940) | 1.00 in (1934) |
| September 12 | 93.9°F (1931) | 35.1°F (2007) | 1.18 in (2020) |
| September 13 | 91.9°F (1939) | 35.1°F (1937) | 0.87 in (2020) |
| September 14 | 95.0°F (1939) | 35.1°F (2013) | 1.07 in (1936) |
| September 15 | 95.0°F (1939) | 27.0°F (2007) | 1.27 in (1936) |
| September 16 | 91.0°F (1931) | 27.0°F (2007) | 1.26 in (1936) |
| September 17 | 88.0°F (2017) | 32.0°F (1936) | 0.35 in (1931) |
| September 18 | 91.0°F (2018) | 33.1°F (1932) | 0.84 in (1934) |
| September 19 | 90.0°F (1940) | 32.0°F (2012) | 0.84 in (2019) |
| September 20 | 88.0°F (1931) | 28.9°F (1937) | 1.81 in (2025) |
| September 21 | 84.9°F (2017) | 32.0°F (2006) | 1.15 in (2018) |
| September 22 | 91.0°F (1937) | 35.1°F (2012) | 3.45 in (2016) |
| September 23 | 93.0°F (2017) | 28.0°F (2012) | 2.15 in (2010) |
| September 24 | 91.9°F (2017) | 30.0°F (2012) | 0.72 in (2010) |
| September 25 | 90.0°F (2017) | 30.0°F (1940) | 1.27 in (1931) |
| September 26 | 90.0°F (2017) | 25.0°F (1940) | 0.98 in (1933) |
| September 27 | 82.9°F (2008) | 28.0°F (2012) | 0.84 in (2011) |
| September 28 | 84.0°F (1939) | 28.9°F (2012) | 0.32 in (2009) |
| September 29 | 82.0°F (2014) | 23.0°F (1941) | 1.27 in (1939) |
| September 30 | 86.0°F (2025) | 27.0°F (1930) | 0.66 in (2008) |