September weather in Belfast, ME
The average temperature in Belfast in September is 58.8°F (48.1°F–69.5°F). Average precipitation: 4.09 inches.
September is a fall month in Belfast, and is warmer than the annual average of 44.1°F. Daily temperatures swing about 21.4°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 17m. For travel, September is a comfortable month to visit.
Avg High
69.5°F
Avg Low
48.1°F
Precipitation
4.09 in
Daylight
12h 17m
September records in Belfast
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 91.9°F (2010) | 35.1°F (1904) | 0.88 in (1956) |
| September 2 | 93.0°F (1953) | 41.0°F (1991) | 1.55 in (1952) |
| September 3 | 87.1°F (1983) | 37.9°F (1904) | 3.45 in (2010) |
| September 4 | 89.1°F (1971) | 39.0°F (1994) | 3.25 in (1972) |
| September 5 | 89.1°F (1971) | 37.0°F (1902) | 1.41 in (1966) |
| September 6 | 90.0°F (1983) | 37.0°F (2000) | 5.61 in (1896) |
| September 7 | 98.1°F (1945) | 37.0°F (1902) | 4.60 in (2008) |
| September 8 | 93.9°F (1945) | 34.0°F (1952) | 1.05 in (1969) |
| September 9 | 93.0°F (2002) | 36.0°F (1903) | 2.43 in (1896) |
| September 10 | 93.0°F (2002) | 36.0°F (1981) | 2.05 in (2021) |
| September 11 | 91.0°F (1961) | 36.0°F (1949) | 2.04 in (1999) |
| September 12 | 89.1°F (1947) | 36.0°F (1967) | 1.84 in (2018) |
| September 13 | 84.9°F (1948) | 32.0°F (1946) | 2.00 in (1977) |
| September 14 | 84.9°F (1903) | 24.1°F (1955) | 2.26 in (1987) |
| September 15 | 84.9°F (1976) | 34.0°F (1963) | 2.48 in (1904) |
| September 16 | 84.0°F (1993) | 34.0°F (1959) | 2.15 in (1893) |
| September 17 | 86.0°F (1991) | 32.0°F (1948) | 4.07 in (1999) |
| September 18 | 84.9°F (1991) | 33.1°F (1950) | 1.33 in (2004) |
| September 19 | 89.1°F (1946) | 34.0°F (2008) | 2.84 in (1894) |
| September 20 | 88.0°F (1985) | 33.1°F (2008) | 1.99 in (1899) |
| September 21 | 82.0°F (1985) | 26.1°F (1948) | 4.04 in (1987) |
| September 22 | 87.1°F (1965) | 28.9°F (1950) | 0.97 in (1979) |
| September 23 | 87.1°F (1965) | 26.1°F (1904) | 1.78 in (1898) |
| September 24 | 84.9°F (1959) | 30.0°F (1953) | 3.82 in (1994) |
| September 25 | 84.0°F (1945) | 30.0°F (1974) | 2.90 in (1991) |
| September 26 | 88.0°F (2007) | 28.9°F (1950) | 2.20 in (1961) |
| September 27 | 86.0°F (2007) | 30.0°F (1947) | 1.95 in (2008) |
| September 28 | 81.0°F (1948) | 30.9°F (2009) | 1.80 in (1962) |
| September 29 | 82.0°F (2014) | 25.0°F (1980) | 2.58 in (1974) |
| September 30 | 81.0°F (1948) | 30.9°F (1903) | 1.66 in (2015) |