September weather in Middletown, DE
The average temperature in Middletown in September is 68.9°F (58.4°F–79.4°F). Average precipitation: 4.87 inches.
September is a fall month in Middletown, and is warmer than the annual average of 55.7°F. Daily temperatures swing about 21°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
79.4°F
Avg Low
58.4°F
Precipitation
4.87 in
Daylight
12h 15m
September records in Middletown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (1953) | 45.0°F (1946) | 4.47 in (2021) |
| September 2 | 100.0°F (1953) | 44.1°F (1896) | 2.16 in (2006) |
| September 3 | 100.0°F (1953) | 44.1°F (1967) | 2.92 in (2000) |
| September 4 | 95.0°F (1993) | 46.0°F (1946) | 1.12 in (1988) |
| September 5 | 96.1°F (1983) | 46.9°F (1896) | 2.14 in (2006) |
| September 6 | 100.0°F (1983) | 39.0°F (2002) | 2.55 in (1979) |
| September 7 | 95.0°F (1943) | 42.1°F (1984) | 1.28 in (1974) |
| September 8 | 93.0°F (2023) | 44.1°F (1984) | 3.40 in (1894) |
| September 9 | 93.0°F (1941) | 42.1°F (1986) | 1.10 in (1902) |
| September 10 | 98.1°F (1983) | 42.1°F (1949) | 1.69 in (1993) |
| September 11 | 100.0°F (1983) | 42.1°F (1949) | 1.70 in (1950) |
| September 12 | 96.1°F (1983) | 43.0°F (1941) | 5.24 in (1960) |
| September 13 | 93.9°F (1952) | 41.0°F (1941) | 2.32 in (1944) |
| September 14 | 90.0°F (1947) | 39.9°F (1985) | 2.23 in (1973) |
| September 15 | 91.0°F (1942) | 39.0°F (1895) | 3.68 in (2003) |
| September 16 | 93.0°F (1991) | 39.9°F (1946) | 8.67 in (1999) |
| September 17 | 91.9°F (1991) | 42.1°F (1959) | 1.81 in (1996) |
| September 18 | 91.0°F (1991) | 37.9°F (1959) | 1.86 in (1945) |
| September 19 | 95.0°F (1983) | 36.0°F (1943) | 3.59 in (1894) |
| September 20 | 93.0°F (1983) | 39.9°F (1979) | 1.76 in (2003) |
| September 21 | 97.0°F (1895) | 33.1°F (1956) | 1.78 in (1983) |
| September 22 | 97.0°F (1895) | 33.1°F (1904) | 1.43 in (1967) |
| September 23 | 96.1°F (1895) | 34.0°F (1904) | 3.00 in (1907) |
| September 24 | 93.9°F (1970) | 34.0°F (1963) | 2.21 in (1975) |
| September 25 | 91.9°F (1970) | 33.1°F (1963) | 1.67 in (1902) |
| September 26 | 91.9°F (1970) | 35.1°F (1940) | 2.55 in (1902) |
| September 27 | 93.0°F (1998) | 30.9°F (1947) | 4.40 in (1985) |
| September 28 | 88.0°F (1945) | 32.0°F (1940) | 0.80 in (1907) |
| September 29 | 90.0°F (1954) | 37.0°F (1942) | 5.71 in (2004) |
| September 30 | 88.0°F (1953) | 32.0°F (1942) | 1.40 in (1948) |