September weather in Tetonia, ID
The average temperature in Tetonia in September is 55.5°F (38.2°F–72.7°F). Average precipitation: 1.47 inches.
September is a fall month in Tetonia, and is warmer than the annual average of 42.2°F. Daily temperatures swing about 34.5°F between overnight low and afternoon high. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
72.7°F
Avg Low
38.2°F
Precipitation
1.47 in
Daylight
12h 17m
September records in Tetonia
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (2022) | 25.0°F (1908) | 0.64 in (2008) |
| September 2 | 93.0°F (2022) | 25.0°F (1910) | 0.70 in (1913) |
| September 3 | 96.1°F (2022) | 3.9°F (1999) | 0.70 in (1971) |
| September 4 | 93.9°F (1950) | 25.0°F (1965) | 0.66 in (2013) |
| September 5 | 95.0°F (2022) | 26.1°F (1910) | 0.92 in (2023) |
| September 6 | 96.1°F (2022) | 21.0°F (1943) | 1.01 in (2002) |
| September 7 | 96.1°F (2022) | 26.1°F (1992) | 0.98 in (2002) |
| September 8 | 91.0°F (2021) | 21.9°F (1922) | 1.19 in (1950) |
| September 9 | 95.0°F (2021) | 19.9°F (1962) | 0.95 in (1961) |
| September 10 | 89.1°F (2021) | 21.9°F (1932) | 0.70 in (2003) |
| September 11 | 87.1°F (1926) | 21.0°F (1916) | 0.70 in (1961) |
| September 12 | 87.1°F (2022) | 19.0°F (2014) | 0.92 in (2010) |
| September 13 | 87.1°F (1926) | 23.0°F (1993) | 0.85 in (1982) |
| September 14 | 89.1°F (1990) | 19.9°F (1947) | 1.30 in (1966) |
| September 15 | 88.0°F (1948) | 14.0°F (1936) | 0.82 in (1914) |
| September 16 | 87.1°F (1926) | 12.9°F (1936) | 0.80 in (1965) |
| September 17 | 86.0°F (1926) | 15.1°F (1936) | 0.80 in (2006) |
| September 18 | 91.9°F (1926) | 17.1°F (1911) | 0.90 in (1961) |
| September 19 | 88.0°F (1956) | 16.0°F (1965) | 0.73 in (1925) |
| September 20 | 88.0°F (1910) | 17.1°F (1912) | 1.20 in (1940) |
| September 21 | 87.1°F (1956) | 15.1°F (1912) | 1.00 in (1925) |
| September 22 | 84.9°F (1956) | 19.0°F (1941) | 1.44 in (2015) |
| September 23 | 84.9°F (1987) | 19.0°F (1985) | 0.95 in (1912) |
| September 24 | 84.9°F (1943) | 19.0°F (1937) | 1.92 in (2016) |
| September 25 | 84.0°F (1943) | 12.9°F (1913) | 0.54 in (1933) |
| September 26 | 84.9°F (1952) | 17.1°F (1908) | 0.96 in (1915) |
| September 27 | 90.0°F (2000) | 14.0°F (1936) | 0.56 in (1959) |
| September 28 | 86.0°F (2022) | 10.9°F (1999) | 0.98 in (2014) |
| September 29 | 82.9°F (1938) | 9.0°F (1985) | 0.75 in (1950) |
| September 30 | 81.0°F (2011) | 9.0°F (1985) | 0.85 in (2014) |