September weather in Union Gap, WA
The average temperature in Union Gap in September is 62.2°F (44.9°F–79.4°F). Average precipitation: 0.23 inches.
September is a fall month in Union Gap, and is warmer than the annual average of 50.8°F. Daily temperatures swing about 34.5°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
79.4°F
Avg Low
44.9°F
Precipitation
0.23 in
Daylight
12h 19m
September records in Union Gap
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1949) | 36.0°F (2000) | 0.65 in (1971) |
| September 2 | 99.0°F (2017) | 39.0°F (1948) | 0.15 in (1979) |
| September 3 | 100.0°F (1988) | 35.1°F (2000) | 0.29 in (1978) |
| September 4 | 98.1°F (1988) | 35.1°F (1996) | 0.08 in (2007) |
| September 5 | 97.0°F (1955) | 35.1°F (1996) | 0.21 in (2009) |
| September 6 | 98.1°F (2024) | 36.0°F (1960) | 0.40 in (1995) |
| September 7 | 95.0°F (2011) | 33.1°F (1992) | 0.26 in (2010) |
| September 8 | 97.0°F (2011) | 35.1°F (1962) | 0.31 in (2019) |
| September 9 | 98.1°F (2011) | 34.0°F (1959) | 0.32 in (1985) |
| September 10 | 99.0°F (2011) | 36.0°F (1972) | 0.32 in (1985) |
| September 11 | 98.1°F (2011) | 35.1°F (1964) | 0.51 in (1956) |
| September 12 | 98.1°F (2011) | 34.0°F (1949) | 0.05 in (2022) |
| September 13 | 97.0°F (2013) | 28.0°F (1970) | 0.45 in (1980) |
| September 14 | 96.1°F (2013) | 34.0°F (1952) | 0.21 in (1996) |
| September 15 | 93.9°F (2013) | 33.1°F (1993) | 1.36 in (1986) |
| September 16 | 93.9°F (1981) | 33.1°F (1965) | 0.83 in (1954) |
| September 17 | 95.0°F (1981) | 30.0°F (1965) | 0.26 in (1986) |
| September 18 | 91.9°F (1952) | 30.0°F (1988) | 0.30 in (1959) |
| September 19 | 90.0°F (1952) | 30.9°F (1971) | 0.40 in (1982) |
| September 20 | 90.0°F (1952) | 30.0°F (1993) | 0.19 in (2008) |
| September 21 | 89.1°F (1962) | 30.9°F (1971) | 0.12 in (1977) |
| September 22 | 91.0°F (1947) | 30.0°F (1981) | 0.29 in (1973) |
| September 23 | 90.0°F (1947) | 25.0°F (2000) | 0.24 in (1977) |
| September 24 | 91.9°F (1952) | 27.0°F (2000) | 0.30 in (2014) |
| September 25 | 93.0°F (1952) | 27.0°F (1972) | 0.38 in (1982) |
| September 26 | 90.0°F (1949) | 26.1°F (1972) | 0.62 in (1948) |
| September 27 | 91.0°F (1963) | 26.1°F (1972) | 0.47 in (1957) |
| September 28 | 91.0°F (1963) | 28.0°F (1999) | 0.28 in (1947) |
| September 29 | 86.0°F (1963) | 24.1°F (1985) | 0.10 in (1951) |
| September 30 | 84.9°F (1976) | 26.1°F (1985) | 0.26 in (2005) |