September weather in Westfield, NJ
The average temperature in Westfield in September is 68.1°F (59.2°F–77.1°F). Average precipitation: 4.25 inches.
September is a fall month in Westfield, and is warmer than the annual average of 54.6°F. Daily temperatures swing about 17.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
77.1°F
Avg Low
59.2°F
Precipitation
4.25 in
Daylight
12h 15m
September records in Westfield
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (2010) | 48.0°F (1970) | 0.70 in (1978) |
| September 2 | 98.1°F (1980) | 46.0°F (1970) | 1.27 in (2002) |
| September 3 | 96.1°F (1980) | 45.0°F (1991) | 3.25 in (1969) |
| September 4 | 96.1°F (1973) | 45.0°F (1976) | 4.45 in (1969) |
| September 5 | 93.0°F (2008) | 42.1°F (1978) | 0.37 in (1991) |
| September 6 | 96.1°F (1983) | 44.1°F (1984) | 3.17 in (1979) |
| September 7 | 95.0°F (2015) | 39.0°F (1984) | 4.50 in (2008) |
| September 8 | 93.0°F (2015) | 41.0°F (1984) | 1.95 in (2004) |
| September 9 | 93.9°F (2015) | 41.0°F (1986) | 1.36 in (1996) |
| September 10 | 99.0°F (1983) | 39.0°F (1975) | 1.45 in (1992) |
| September 11 | 99.0°F (1983) | 43.0°F (1969) | 0.59 in (2015) |
| September 12 | 91.0°F (1983) | 37.0°F (1977) | 3.85 in (1971) |
| September 13 | 93.0°F (2005) | 41.0°F (1985) | 1.74 in (1987) |
| September 14 | 95.0°F (2005) | 37.0°F (1975) | 1.96 in (2001) |
| September 15 | 91.9°F (2008) | 36.0°F (1975) | 1.50 in (1973) |
| September 16 | 93.9°F (1991) | 37.9°F (1983) | 1.18 in (2002) |
| September 17 | 93.0°F (1991) | 39.0°F (1986) | 9.76 in (1999) |
| September 18 | 91.9°F (2015) | 37.0°F (1990) | 2.80 in (1980) |
| September 19 | 93.9°F (1983) | 39.9°F (1984) | 1.09 in (1989) |
| September 20 | 91.9°F (1983) | 35.1°F (1979) | 3.05 in (1989) |
| September 21 | 91.0°F (1983) | 41.0°F (1991) | 1.91 in (1989) |
| September 22 | 91.9°F (1970) | 37.0°F (1997) | 2.75 in (1979) |
| September 23 | 95.0°F (1970) | 37.9°F (1976) | 1.86 in (1975) |
| September 24 | 91.0°F (1970) | 33.1°F (1974) | 1.85 in (1975) |
| September 25 | 90.0°F (1970) | 35.1°F (1997) | 1.93 in (1991) |
| September 26 | 91.0°F (1970) | 37.0°F (1978) | 2.35 in (1975) |
| September 27 | 90.0°F (2007) | 37.9°F (1984) | 3.98 in (1985) |
| September 28 | 90.0°F (1998) | 34.0°F (1989) | 1.10 in (1974) |
| September 29 | 87.1°F (2014) | 34.0°F (1978) | 2.92 in (2004) |
| September 30 | 88.0°F (1986) | 34.0°F (1981) | 1.76 in (2015) |