September weather in Norwalk, CT
The average temperature in Norwalk in September is 66.0°F (56.2°F–75.7°F). Average precipitation: 5.21 inches.
September is a fall month in Norwalk, and is warmer than the annual average of 52.6°F. Daily temperatures swing about 19.5°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 15m. For travel, September is a wet month.
Avg High
75.7°F
Avg Low
56.2°F
Precipitation
5.21 in
Daylight
12h 15m
September records in Norwalk
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.0°F (1980) | 44.1°F (1970) | 1.47 in (1981) |
| September 2 | 93.9°F (1980) | 44.1°F (1987) | 2.33 in (2002) |
| September 3 | 91.9°F (1980) | 37.9°F (1967) | 3.79 in (1974) |
| September 4 | 91.9°F (1973) | 44.1°F (1976) | 2.32 in (1992) |
| September 5 | 91.0°F (1983) | 43.0°F (1997) | 0.62 in (1988) |
| September 6 | 96.1°F (2018) | 42.1°F (1984) | 1.51 in (1979) |
| September 7 | 91.9°F (1983) | 37.9°F (1984) | 2.25 in (1956) |
| September 8 | 96.1°F (2015) | 39.9°F (1962) | 4.62 in (2004) |
| September 9 | 91.0°F (2002) | 41.0°F (1986) | 2.40 in (1981) |
| September 10 | 95.0°F (1983) | 37.0°F (1975) | 1.96 in (1999) |
| September 11 | 97.0°F (1983) | 37.9°F (1956) | 2.72 in (1968) |
| September 12 | 95.0°F (1983) | 37.0°F (1958) | 3.75 in (1960) |
| September 13 | 89.1°F (1957) | 39.9°F (1958) | 2.06 in (1987) |
| September 14 | 91.0°F (2016) | 39.0°F (1975) | 1.51 in (2001) |
| September 15 | 86.0°F (1993) | 36.0°F (1975) | 1.21 in (2002) |
| September 16 | 89.1°F (1991) | 35.1°F (1964) | 5.02 in (1999) |
| September 17 | 89.1°F (1991) | 37.0°F (1984) | 1.47 in (1999) |
| September 18 | 86.0°F (2015) | 34.0°F (1990) | 2.35 in (2004) |
| September 19 | 91.9°F (1983) | 35.1°F (1956) | 1.32 in (1978) |
| September 20 | 91.9°F (1983) | 34.0°F (1979) | 2.23 in (1977) |
| September 21 | 88.0°F (1980) | 30.9°F (1956) | 2.06 in (2001) |
| September 22 | 91.9°F (1980) | 34.0°F (1962) | 2.97 in (1979) |
| September 23 | 93.0°F (1970) | 33.1°F (1962) | 1.94 in (1975) |
| September 24 | 86.0°F (1959) | 30.0°F (1963) | 1.42 in (1977) |
| September 25 | 89.1°F (1970) | 28.9°F (1963) | 2.56 in (1991) |
| September 26 | 87.1°F (2017) | 30.0°F (1963) | 4.38 in (1975) |
| September 27 | 90.0°F (1998) | 34.0°F (1963) | 4.02 in (1985) |
| September 28 | 87.1°F (2014) | 28.0°F (1957) | 1.22 in (2003) |
| September 29 | 82.0°F (1996) | 30.0°F (1957) | 2.70 in (1974) |
| September 30 | 86.0°F (1986) | 33.1°F (1981) | 2.48 in (1963) |