September weather in Heron Lake, MN
The average temperature in Heron Lake in September is 60.8°F (48.9°F–72.7°F). Average precipitation: 3.11 inches.
September is a fall month in Heron Lake, and is warmer than the annual average of 44°F. Daily temperatures swing about 23.8°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
72.7°F
Avg Low
48.9°F
Precipitation
3.11 in
Daylight
12h 17m
September records in Heron Lake
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 87.1°F (2013) | 44.1°F (2009) | 0.23 in (2014) |
| September 2 | 91.0°F (1999) | 45.0°F (2009) | 0.63 in (2017) |
| September 3 | 95.0°F (2023) | 43.0°F (2008) | 1.71 in (2021) |
| September 4 | 93.0°F (2023) | 37.0°F (2025) | 0.75 in (1949) |
| September 5 | 93.9°F (2023) | 42.1°F (2011) | 2.38 in (2018) |
| September 6 | 88.0°F (2015) | 37.9°F (2025) | 1.02 in (2004) |
| September 7 | 91.0°F (1998) | 37.9°F (2025) | 1.36 in (2007) |
| September 8 | 90.0°F (2002) | 39.9°F (2012) | 0.95 in (2005) |
| September 9 | 90.0°F (2002) | 41.0°F (2008) | 1.33 in (2010) |
| September 10 | 91.0°F (2013) | 37.9°F (2020) | 1.58 in (1949) |
| September 11 | 87.1°F (2005) | 42.1°F (1999) | 1.68 in (2019) |
| September 12 | 91.9°F (2012) | 36.0°F (2007) | 1.30 in (2019) |
| September 13 | 91.9°F (1998) | 34.0°F (2014) | 0.17 in (2005) |
| September 14 | 91.9°F (2025) | 35.1°F (1996) | 1.23 in (2004) |
| September 15 | 90.0°F (2022) | 30.0°F (2011) | 3.71 in (2004) |
| September 16 | 88.0°F (2018) | 30.9°F (2011) | 1.72 in (2006) |
| September 17 | 91.9°F (2021) | 37.9°F (2014) | 0.24 in (2021) |
| September 18 | 89.1°F (2007) | 32.0°F (2012) | 1.52 in (2019) |
| September 19 | 88.0°F (1998) | 35.1°F (2012) | 1.00 in (2018) |
| September 20 | 91.0°F (1998) | 30.9°F (2006) | 1.71 in (2018) |
| September 21 | 96.1°F (2022) | 28.9°F (1999) | 1.41 in (1950) |
| September 22 | 91.0°F (2005) | 32.0°F (2000) | 1.41 in (2004) |
| September 23 | 91.0°F (2017) | 27.0°F (2012) | 5.00 in (2010) |
| September 24 | 87.1°F (2017) | 27.0°F (2012) | 0.87 in (2023) |
| September 25 | 86.0°F (2017) | 28.9°F (2000) | 5.48 in (2005) |
| September 26 | 87.1°F (1999) | 28.9°F (2000) | 0.80 in (1996) |
| September 27 | 88.0°F (2021) | 32.0°F (2012) | 0.07 in (2002) |
| September 28 | 84.9°F (2021) | 33.1°F (2022) | 0.09 in (2013) |
| September 29 | 86.0°F (2024) | 28.9°F (1999) | 0.36 in (2008) |
| September 30 | 89.1°F (2025) | 28.0°F (2003) | 0.39 in (2007) |