September weather in Morristown, NJ
The average temperature in Morristown in September is 67.1°F (56.3°F–77.9°F). Average precipitation: 4.64 inches.
September is a fall month in Morristown, and is warmer than the annual average of 53.3°F. Daily temperatures swing about 21.6°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
77.9°F
Avg Low
56.3°F
Precipitation
4.64 in
Daylight
12h 15m
September records in Morristown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (2010) | 41.0°F (1936) | 1.70 in (1978) |
| September 2 | 96.1°F (1943) | 42.1°F (1949) | 6.19 in (2021) |
| September 3 | 97.0°F (1980) | 42.1°F (1941) | 2.22 in (2006) |
| September 4 | 97.0°F (2015) | 39.9°F (1946) | 3.38 in (1969) |
| September 5 | 95.0°F (2008) | 44.1°F (1994) | 1.15 in (1935) |
| September 6 | 93.9°F (2018) | 35.1°F (1938) | 4.10 in (1979) |
| September 7 | 98.1°F (1983) | 39.9°F (1962) | 4.70 in (2008) |
| September 8 | 97.0°F (2015) | 39.0°F (1940) | 2.00 in (1998) |
| September 9 | 100.0°F (2015) | 36.0°F (1938) | 2.55 in (1934) |
| September 10 | 95.0°F (2015) | 35.1°F (1932) | 1.16 in (2018) |
| September 11 | 98.1°F (1983) | 36.0°F (1935) | 3.68 in (1954) |
| September 12 | 99.0°F (1983) | 36.0°F (1943) | 3.37 in (1971) |
| September 13 | 93.9°F (2005) | 35.1°F (1943) | 2.52 in (1944) |
| September 14 | 95.0°F (2005) | 37.0°F (1946) | 1.91 in (1937) |
| September 15 | 93.0°F (2008) | 35.1°F (1963) | 3.95 in (1933) |
| September 16 | 91.0°F (1943) | 35.1°F (1985) | 2.42 in (1999) |
| September 17 | 93.0°F (1991) | 35.1°F (1935) | 7.60 in (1999) |
| September 18 | 93.0°F (1991) | 30.9°F (1937) | 1.60 in (2004) |
| September 19 | 91.9°F (1946) | 34.0°F (1939) | 2.70 in (1945) |
| September 20 | 91.9°F (1983) | 35.1°F (1979) | 3.95 in (1938) |
| September 21 | 93.0°F (1983) | 30.9°F (1937) | 1.82 in (1938) |
| September 22 | 91.9°F (1931) | 36.0°F (1939) | 5.26 in (1966) |
| September 23 | 91.9°F (1941) | 34.0°F (1963) | 1.73 in (1975) |
| September 24 | 95.0°F (1970) | 28.0°F (1963) | 1.28 in (1975) |
| September 25 | 93.0°F (2017) | 30.0°F (1963) | 3.05 in (1991) |
| September 26 | 91.9°F (2017) | 28.0°F (1932) | 1.98 in (2018) |
| September 27 | 91.0°F (1970) | 26.1°F (1947) | 3.40 in (1975) |
| September 28 | 96.1°F (1933) | 26.1°F (1947) | 2.93 in (1985) |
| September 29 | 89.1°F (1945) | 30.0°F (1942) | 3.17 in (2004) |
| September 30 | 84.9°F (1959) | 30.0°F (1932) | 2.66 in (2020) |