September weather in Washington, IL
The average temperature in Washington in September is °F (°F–°F). Average precipitation: 3.27 inches.
September is a fall month in Washington, and is cooler than the annual average of 0°F. Expect about 8 days with precipitation. Daylight averages about 12h 15m.
Avg High
°F
Avg Low
°F
Precipitation
3.27 in
Daylight
12h 15m
September records in Washington
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | — | — | 2.64 in (2003) |
| September 2 | — | — | 1.41 in (2012) |
| September 3 | — | — | 0.30 in (1997) |
| September 4 | — | — | 0.43 in (2011) |
| September 5 | — | — | 2.58 in (2008) |
| September 6 | — | — | 1.06 in (2009) |
| September 7 | — | — | 0.75 in (2020) |
| September 8 | — | — | 1.59 in (2016) |
| September 9 | — | — | 1.09 in (2015) |
| September 10 | — | — | 1.56 in (2014) |
| September 11 | — | — | 1.05 in (2014) |
| September 12 | — | — | 0.76 in (2000) |
| September 13 | — | — | 0.60 in (2020) |
| September 14 | — | — | 3.86 in (2008) |
| September 15 | — | — | 1.19 in (2008) |
| September 16 | — | — | 0.81 in (2004) |
| September 17 | — | — | 0.91 in (2016) |
| September 18 | — | — | 0.37 in (2012) |
| September 19 | — | — | 2.34 in (2015) |
| September 20 | — | — | 0.99 in (2005) |
| September 21 | — | — | 1.24 in (2021) |
| September 22 | — | — | 0.66 in (2019) |
| September 23 | — | — | 1.02 in (2023) |
| September 24 | — | — | 0.86 in (2005) |
| September 25 | — | — | 1.10 in (2023) |
| September 26 | — | — | 0.43 in (2009) |
| September 27 | — | — | 1.19 in (2011) |
| September 28 | — | — | 2.08 in (2019) |
| September 29 | — | — | 0.97 in (2005) |
| September 30 | — | — | 0.98 in (2019) |