September weather in Idaho City, ID
The average temperature in Idaho City in September is 56.1°F (35.6°F–76.5°F). Average precipitation: 0.77 inches.
September is a fall month in Idaho City, and is warmer than the annual average of 43.9°F. Daily temperatures swing about 40.9°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 12h 17m. For travel, September is cool.
Avg High
76.5°F
Avg Low
35.6°F
Precipitation
0.77 in
Daylight
12h 17m
September records in Idaho City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1945) | 28.9°F (2006) | 0.61 in (1915) |
| September 2 | 97.0°F (1945) | 26.1°F (2008) | 0.75 in (1909) |
| September 3 | 100.0°F (1950) | 24.1°F (1927) | 0.33 in (2000) |
| September 4 | 98.1°F (1924) | 26.1°F (1969) | 0.84 in (1940) |
| September 5 | 99.0°F (1955) | 25.0°F (1956) | 0.19 in (1972) |
| September 6 | 98.1°F (1904) | 25.0°F (2010) | 0.80 in (2001) |
| September 7 | 96.1°F (1904) | 21.9°F (1992) | 1.27 in (1965) |
| September 8 | 98.1°F (1904) | 23.0°F (1927) | 0.60 in (1918) |
| September 9 | 91.9°F (1935) | 23.0°F (1932) | 0.67 in (1958) |
| September 10 | 95.0°F (1935) | 26.1°F (1928) | 0.77 in (1980) |
| September 11 | 98.1°F (1937) | 26.1°F (1929) | 1.31 in (1976) |
| September 12 | 98.1°F (1959) | 23.0°F (1949) | 0.67 in (1939) |
| September 13 | 100.0°F (1981) | 23.0°F (1992) | 1.27 in (1897) |
| September 14 | 97.0°F (1981) | 19.9°F (1970) | 0.87 in (1959) |
| September 15 | 98.1°F (1937) | 17.1°F (1936) | 0.49 in (1959) |
| September 16 | 96.1°F (1938) | 18.0°F (1936) | 0.48 in (1996) |
| September 17 | 96.1°F (1929) | 19.0°F (1965) | 0.72 in (1947) |
| September 18 | 98.1°F (1981) | 18.0°F (1965) | 0.98 in (1961) |
| September 19 | 93.9°F (1939) | 21.0°F (1965) | 0.90 in (1959) |
| September 20 | 96.1°F (1939) | 23.0°F (1942) | 1.77 in (1982) |
| September 21 | 93.9°F (1936) | 19.9°F (1993) | 0.28 in (1986) |
| September 22 | 93.9°F (1949) | 19.0°F (1956) | 0.38 in (1896) |
| September 23 | 96.1°F (1949) | 19.9°F (1926) | 0.87 in (1918) |
| September 24 | 91.9°F (1943) | 12.9°F (1926) | 1.06 in (1977) |
| September 25 | 91.0°F (1952) | 12.0°F (1926) | 0.68 in (1992) |
| September 26 | 96.1°F (1897) | 15.1°F (1934) | 0.69 in (1959) |
| September 27 | 91.0°F (1905) | 18.0°F (1926) | 0.58 in (1986) |
| September 28 | 89.1°F (1963) | 17.1°F (1999) | 0.61 in (1949) |
| September 29 | 91.0°F (1963) | 17.1°F (1999) | 1.40 in (1927) |
| September 30 | 89.1°F (1992) | 10.9°F (1954) | 1.08 in (1983) |