September weather in Rupert, ID
The average temperature in Rupert in September is 59.2°F (44.8°F–73.7°F). Average precipitation: 0.61 inches.
September is a fall month in Rupert, and is warmer than the annual average of 47°F. Daily temperatures swing about 28.9°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
73.7°F
Avg Low
44.8°F
Precipitation
0.61 in
Daylight
12h 16m
September records in Rupert
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1995) | 34.0°F (1965) | 0.33 in (1973) |
| September 2 | 97.0°F (1998) | 33.1°F (1975) | 0.58 in (1997) |
| September 3 | 95.0°F (1950) | 32.0°F (1943) | 0.41 in (1940) |
| September 4 | 100.0°F (1998) | 33.1°F (1975) | 0.71 in (1946) |
| September 5 | 96.1°F (1976) | 33.1°F (1956) | 0.76 in (2016) |
| September 6 | 95.0°F (1976) | 32.0°F (1943) | 0.96 in (1978) |
| September 7 | 97.0°F (1955) | 32.0°F (1941) | 0.85 in (1925) |
| September 8 | 96.1°F (1979) | 26.1°F (1976) | 0.29 in (1980) |
| September 9 | 93.9°F (1997) | 27.0°F (1976) | 0.60 in (1985) |
| September 10 | 91.9°F (1988) | 28.9°F (1945) | 0.45 in (1998) |
| September 11 | 93.9°F (1943) | 32.0°F (1941) | 0.90 in (1980) |
| September 12 | 96.1°F (1990) | 30.0°F (1988) | 0.26 in (1940) |
| September 13 | 95.0°F (1953) | 28.0°F (1993) | 0.25 in (2001) |
| September 14 | 93.9°F (2000) | 28.0°F (1947) | 0.26 in (2016) |
| September 15 | 97.0°F (1948) | 30.0°F (1941) | 0.83 in (1959) |
| September 16 | 96.1°F (1948) | 30.9°F (1965) | 0.45 in (2017) |
| September 17 | 91.0°F (1998) | 26.1°F (1965) | 0.20 in (1977) |
| September 18 | 91.9°F (1938) | 23.0°F (1965) | 1.26 in (1940) |
| September 19 | 91.9°F (1962) | 19.9°F (1965) | 0.87 in (1948) |
| September 20 | 91.9°F (1984) | 27.0°F (1945) | 0.62 in (1968) |
| September 21 | 90.0°F (1938) | 27.0°F (1975) | 0.76 in (2017) |
| September 22 | 91.0°F (1939) | 25.0°F (1945) | 0.51 in (1945) |
| September 23 | 91.9°F (1966) | 27.0°F (1955) | 1.07 in (2016) |
| September 24 | 90.0°F (1943) | 26.1°F (2000) | 0.38 in (2016) |
| September 25 | 91.0°F (1947) | 24.1°F (1937) | 0.94 in (1948) |
| September 26 | 89.1°F (1952) | 26.1°F (1970) | 0.17 in (1979) |
| September 27 | 90.0°F (1938) | 25.0°F (1945) | 0.46 in (1959) |
| September 28 | 90.0°F (1963) | 23.0°F (1945) | 0.57 in (1940) |
| September 29 | 89.1°F (1963) | 21.9°F (1945) | 1.07 in (1994) |
| September 30 | 90.0°F (1967) | 25.0°F (1985) | 0.38 in (2009) |