September weather in Washington, VA
The average temperature in Washington in September is 66.5°F (55.7°F–77.3°F). Average precipitation: 5.44 inches.
September is a fall month in Washington, and is warmer than the annual average of 54.2°F. Daily temperatures swing about 21.6°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 14m. For travel, September is a wet month.
Avg High
77.3°F
Avg Low
55.7°F
Precipitation
5.44 in
Daylight
12h 14m
September records in Washington
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (2016) | 50.0°F (2009) | 1.80 in (2020) |
| September 2 | 93.9°F (1998) | 48.9°F (2009) | 3.66 in (2006) |
| September 3 | 91.9°F (2010) | 48.0°F (2009) | 0.93 in (2000) |
| September 4 | 93.9°F (2018) | 46.9°F (2024) | 0.76 in (2012) |
| September 5 | 99.0°F (2023) | 46.9°F (2024) | 3.87 in (1996) |
| September 6 | 99.0°F (1998) | 46.0°F (2000) | 2.08 in (1999) |
| September 7 | 97.0°F (2023) | 45.0°F (2000) | 5.49 in (1996) |
| September 8 | 93.0°F (2016) | 46.9°F (2017) | 1.24 in (2004) |
| September 9 | 96.1°F (2016) | 43.0°F (2024) | 3.44 in (2004) |
| September 10 | 96.1°F (2016) | 44.1°F (2024) | 2.55 in (2018) |
| September 11 | 93.9°F (2016) | 46.9°F (2010) | 2.00 in (1997) |
| September 12 | 96.1°F (1998) | 48.0°F (2012) | 0.78 in (2019) |
| September 13 | 96.1°F (1998) | 48.9°F (2002) | 1.65 in (2003) |
| September 14 | 93.9°F (1998) | 45.0°F (2014) | 0.50 in (2006) |
| September 15 | 95.0°F (2016) | 42.1°F (2001) | 0.85 in (2011) |
| September 16 | 95.0°F (1998) | 43.0°F (2001) | 1.63 in (1999) |
| September 17 | 90.0°F (1998) | 41.0°F (2000) | 0.92 in (2009) |
| September 18 | 88.0°F (2017) | 41.0°F (2013) | 4.38 in (2004) |
| September 19 | 88.0°F (2016) | 39.9°F (2013) | 3.60 in (2003) |
| September 20 | 89.1°F (1998) | 37.9°F (2020) | 3.18 in (2000) |
| September 21 | 91.0°F (1998) | 39.0°F (2020) | 1.51 in (1999) |
| September 22 | 88.0°F (2019) | 39.9°F (2020) | 0.75 in (2021) |
| September 23 | 90.0°F (2010) | 42.1°F (2020) | 3.15 in (2003) |
| September 24 | 91.9°F (2016) | 0.0°F (2017) | 1.36 in (2023) |
| September 25 | 93.9°F (2010) | 41.0°F (2012) | 1.68 in (2001) |
| September 26 | 93.0°F (2010) | 39.9°F (2012) | 1.77 in (2000) |
| September 27 | 99.0°F (1998) | 39.9°F (2001) | 1.96 in (2002) |
| September 28 | 90.0°F (1998) | 37.9°F (2022) | 1.95 in (2010) |
| September 29 | 82.9°F (2019) | 39.9°F (2013) | 3.14 in (2004) |
| September 30 | 90.0°F (1998) | 39.9°F (2003) | 5.22 in (2015) |