September weather in Riddle, OR
The average temperature in Riddle in September is 66.0°F (48.5°F–83.6°F). Average precipitation: 0.71 inches.
September is a fall month in Riddle, and is warmer than the annual average of 56.7°F. Daily temperatures swing about 35.1°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
83.6°F
Avg Low
48.5°F
Precipitation
0.71 in
Daylight
12h 17m
September records in Riddle
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 105.1°F (1987) | 39.0°F (1918) | 0.56 in (1941) |
| September 2 | 107.1°F (1934) | 39.0°F (1913) | 0.44 in (1941) |
| September 3 | 108.0°F (1988) | 36.0°F (1921) | 0.28 in (1979) |
| September 4 | 100.0°F (1935) | 39.0°F (1932) | 0.88 in (1970) |
| September 5 | 105.1°F (2024) | 39.0°F (1928) | 0.69 in (1978) |
| September 6 | 108.0°F (2024) | 36.0°F (1914) | 0.77 in (1927) |
| September 7 | 102.0°F (1923) | 32.0°F (1929) | 0.44 in (1925) |
| September 8 | 102.9°F (1981) | 33.1°F (1929) | 0.80 in (1919) |
| September 9 | 102.0°F (1948) | 32.0°F (1928) | 0.57 in (2003) |
| September 10 | 102.9°F (2022) | 34.0°F (1928) | 1.10 in (1978) |
| September 11 | 105.1°F (2022) | 34.0°F (1923) | 0.61 in (1919) |
| September 12 | 100.9°F (1924) | 32.0°F (1921) | 0.22 in (1939) |
| September 13 | 100.9°F (1999) | 30.0°F (1921) | 0.62 in (1968) |
| September 14 | 105.1°F (1937) | 30.0°F (1921) | 0.58 in (1996) |
| September 15 | 102.0°F (1979) | 32.0°F (1921) | 0.60 in (1985) |
| September 16 | 99.0°F (1981) | 30.9°F (1921) | 0.59 in (1976) |
| September 17 | 100.0°F (2025) | 30.0°F (1965) | 0.57 in (2013) |
| September 18 | 98.1°F (2012) | 30.9°F (1965) | 0.90 in (1966) |
| September 19 | 98.1°F (1939) | 33.1°F (1947) | 0.73 in (2021) |
| September 20 | 99.0°F (2014) | 33.1°F (1928) | 1.03 in (1920) |
| September 21 | 100.0°F (1939) | 28.9°F (1929) | 0.77 in (1901) |
| September 22 | 100.0°F (1994) | 33.1°F (1993) | 0.35 in (1901) |
| September 23 | 105.1°F (2009) | 30.9°F (1937) | 0.44 in (1969) |
| September 24 | 102.9°F (1991) | 28.0°F (1926) | 1.12 in (2014) |
| September 25 | 102.9°F (2024) | 24.1°F (1926) | 0.88 in (1923) |
| September 26 | 98.1°F (1967) | 25.0°F (1926) | 1.85 in (1986) |
| September 27 | 97.0°F (2016) | 26.1°F (1929) | 1.40 in (1981) |
| September 28 | 99.0°F (2003) | 27.0°F (1929) | 1.13 in (1977) |
| September 29 | 97.0°F (2020) | 28.0°F (1929) | 0.78 in (2013) |
| September 30 | 100.0°F (1991) | 30.0°F (1929) | 0.65 in (1953) |