September weather in Sisters, OR
The average temperature in Sisters in September is 55.9°F (36.0°F–75.8°F). Average precipitation: 0.54 inches.
September is a fall month in Sisters, and is warmer than the annual average of 45.5°F. Daily temperatures swing about 39.8°F between overnight low and afternoon high. Daylight averages about 12h 17m. For travel, September is cool.
Avg High
75.8°F
Avg Low
36.0°F
Precipitation
0.54 in
Daylight
12h 17m
September records in Sisters
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (1987) | 23.0°F (1973) | 0.39 in (1971) |
| September 2 | 102.9°F (1998) | 25.0°F (1973) | 0.22 in (1979) |
| September 3 | 96.1°F (1998) | 19.0°F (1980) | 0.21 in (1997) |
| September 4 | 100.9°F (1998) | 26.1°F (1980) | 0.42 in (2007) |
| September 5 | 95.0°F (1998) | 28.0°F (1965) | 0.27 in (1971) |
| September 6 | 98.1°F (2003) | 26.1°F (1961) | 0.44 in (1984) |
| September 7 | 97.0°F (1982) | 24.1°F (1976) | 0.21 in (2003) |
| September 8 | 93.0°F (1963) | 24.1°F (1976) | 0.19 in (2010) |
| September 9 | 97.0°F (1981) | 21.0°F (1977) | 0.42 in (1985) |
| September 10 | 96.1°F (1993) | 21.0°F (1984) | 0.15 in (2019) |
| September 11 | 95.0°F (1990) | 26.1°F (1964) | 0.42 in (1997) |
| September 12 | 91.9°F (2011) | 21.9°F (1984) | 0.16 in (1994) |
| September 13 | 93.0°F (1995) | 17.1°F (1970) | 0.16 in (1978) |
| September 14 | 91.9°F (2015) | 18.0°F (1970) | 0.45 in (1973) |
| September 15 | 93.0°F (1998) | 21.0°F (1970) | 0.65 in (1963) |
| September 16 | 96.1°F (1995) | 21.9°F (1987) | 0.15 in (2019) |
| September 17 | 93.0°F (1984) | 16.0°F (1965) | 0.20 in (2015) |
| September 18 | 93.9°F (1984) | 17.1°F (1965) | 0.45 in (1980) |
| September 19 | 91.0°F (2000) | 21.9°F (1965) | 0.26 in (1959) |
| September 20 | 90.0°F (1967) | 21.9°F (1982) | 1.36 in (1982) |
| September 21 | 93.0°F (1967) | 19.0°F (1983) | 0.12 in (1972) |
| September 22 | 90.0°F (1999) | 21.0°F (1977) | 0.12 in (1973) |
| September 23 | 93.0°F (1992) | 18.0°F (2000) | 0.35 in (1972) |
| September 24 | 91.9°F (1987) | 17.1°F (1970) | 0.52 in (1992) |
| September 25 | 93.0°F (1994) | 19.0°F (1970) | 0.31 in (2014) |
| September 26 | 93.0°F (1994) | 21.0°F (1977) | 0.35 in (2001) |
| September 27 | 93.9°F (1963) | 21.9°F (1974) | 1.32 in (1981) |
| September 28 | 91.0°F (1967) | 19.9°F (1985) | 0.35 in (1962) |
| September 29 | 91.0°F (1996) | 16.0°F (1983) | 0.35 in (1994) |
| September 30 | 90.0°F (1993) | 15.1°F (1985) | 0.38 in (2019) |