September weather in Pasco, WA
The average temperature in Pasco in September is 64.2°F (47.6°F–80.9°F). Average precipitation: 0.31 inches.
September is a fall month in Pasco, and is warmer than the annual average of 53.3°F. Daily temperatures swing about 33.3°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
80.9°F
Avg Low
47.6°F
Precipitation
0.31 in
Daylight
12h 19m
September records in Pasco
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 102.0°F (2022) | 37.9°F (1999) | 0.01 in (2023) |
| September 2 | 100.0°F (1998) | 39.9°F (1999) | 0.10 in (2000) |
| September 3 | 98.1°F (1998) | 39.0°F (1999) | 0.06 in (2013) |
| September 4 | 98.1°F (2003) | 39.0°F (2015) | 0.18 in (2000) |
| September 5 | 99.0°F (2003) | 44.1°F (2005) | 0.32 in (2013) |
| September 6 | 98.1°F (2003) | 39.9°F (2002) | 0.23 in (2016) |
| September 7 | 96.1°F (2024) | 39.0°F (1999) | 0.05 in (2003) |
| September 8 | 96.1°F (2021) | 36.0°F (2001) | 0.18 in (2003) |
| September 9 | 93.9°F (2011) | 37.9°F (2000) | 0.16 in (2010) |
| September 10 | 93.0°F (2011) | 41.0°F (2007) | 0.29 in (2000) |
| September 11 | 93.9°F (2013) | 37.0°F (2012) | 0.09 in (2024) |
| September 12 | 97.0°F (2011) | 33.1°F (2012) | 0.02 in (2024) |
| September 13 | 96.1°F (2013) | 37.0°F (2012) | 0.12 in (2004) |
| September 14 | 93.0°F (1998) | 36.0°F (2016) | 0.09 in (2025) |
| September 15 | 93.9°F (2013) | 41.0°F (2008) | 0.27 in (2013) |
| September 16 | 93.9°F (1998) | 37.9°F (2006) | 0.14 in (2019) |
| September 17 | 91.0°F (2023) | 37.0°F (2006) | 0.09 in (2022) |
| September 18 | 91.0°F (2000) | 39.0°F (2018) | 0.26 in (2010) |
| September 19 | 89.1°F (2012) | 37.0°F (2004) | 0.49 in (2010) |
| September 20 | 91.9°F (2025) | 37.0°F (1999) | 0.27 in (2006) |
| September 21 | 89.1°F (2014) | 36.0°F (2007) | 0.11 in (1945) |
| September 22 | 91.0°F (1999) | 34.0°F (2002) | 0.05 in (2013) |
| September 23 | 93.0°F (2011) | 28.0°F (2000) | 0.11 in (2010) |
| September 24 | 93.0°F (2001) | 26.1°F (2000) | 0.02 in (2023) |
| September 25 | 91.9°F (2024) | 30.9°F (2000) | 0.13 in (1998) |
| September 26 | 89.1°F (2003) | 32.0°F (2000) | 0.03 in (2001) |
| September 27 | 87.1°F (2003) | 30.9°F (1999) | 0.20 in (2021) |
| September 28 | 89.1°F (2010) | 28.0°F (1999) | 0.21 in (2007) |
| September 29 | 88.0°F (2006) | 33.1°F (1999) | 0.06 in (2000) |
| September 30 | 84.9°F (2006) | 33.1°F (2024) | 0.72 in (2005) |