September weather in Plainfield, NJ
The average temperature in Plainfield in September is 68.4°F (57.5°F–79.4°F). Average precipitation: 4.27 inches.
September is a fall month in Plainfield, and is warmer than the annual average of 54.8°F. Daily temperatures swing about 21.9°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
79.4°F
Avg Low
57.5°F
Precipitation
4.27 in
Daylight
12h 15m
September records in Plainfield
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (1953) | 42.1°F (1926) | 2.51 in (1952) |
| September 2 | 105.1°F (1953) | 44.1°F (1949) | 2.35 in (1899) |
| September 3 | 99.0°F (1929) | 42.1°F (1893) | 4.90 in (1905) |
| September 4 | 99.0°F (1929) | 43.0°F (1908) | 2.75 in (1969) |
| September 5 | 93.9°F (1961) | 46.0°F (1924) | 1.06 in (1947) |
| September 6 | 99.0°F (1983) | 41.0°F (1909) | 4.67 in (1926) |
| September 7 | 93.0°F (1983) | 39.0°F (1924) | 2.00 in (1943) |
| September 8 | 93.9°F (1939) | 43.0°F (1962) | 4.80 in (1934) |
| September 9 | 95.0°F (1964) | 42.1°F (1986) | 2.33 in (1929) |
| September 10 | 100.0°F (1983) | 39.9°F (1956) | 1.24 in (1909) |
| September 11 | 100.0°F (1983) | 35.1°F (1917) | 4.06 in (1954) |
| September 12 | 97.0°F (1895) | 36.0°F (1917) | 4.04 in (1960) |
| September 13 | 95.0°F (2005) | 37.0°F (1917) | 3.22 in (1963) |
| September 14 | 93.9°F (1931) | 37.0°F (1911) | 3.72 in (1930) |
| September 15 | 93.9°F (1927) | 35.1°F (1923) | 3.40 in (1904) |
| September 16 | 93.9°F (1991) | 37.9°F (1984) | 9.77 in (1999) |
| September 17 | 93.9°F (1991) | 36.0°F (1923) | 1.45 in (1995) |
| September 18 | 90.0°F (1965) | 33.1°F (1923) | 3.02 in (1942) |
| September 19 | 96.1°F (1983) | 36.0°F (1959) | 2.28 in (1894) |
| September 20 | 93.9°F (1983) | 35.1°F (1993) | 3.47 in (1938) |
| September 21 | 102.0°F (1895) | 34.0°F (1956) | 5.33 in (1966) |
| September 22 | 102.0°F (1895) | 30.9°F (1904) | 2.24 in (1979) |
| September 23 | 99.0°F (1895) | 33.1°F (1904) | 3.04 in (1919) |
| September 24 | 91.0°F (1970) | 35.1°F (1950) | 2.24 in (1946) |
| September 25 | 91.9°F (1970) | 33.1°F (1950) | 2.78 in (1940) |
| September 26 | 93.0°F (1895) | 30.0°F (1922) | 2.89 in (1975) |
| September 27 | 91.9°F (1998) | 30.9°F (1957) | 3.30 in (1985) |
| September 28 | 84.9°F (1948) | 32.0°F (1957) | 6.16 in (2004) |
| September 29 | 88.0°F (1921) | 34.0°F (1942) | 2.14 in (1963) |
| September 30 | 89.1°F (1986) | 33.1°F (1942) | 2.40 in (1924) |