September weather in Dewey Beach, DE
The average temperature in Dewey Beach in September is 71.7°F (63.7°F–79.6°F). Average precipitation: 4.49 inches.
September is a fall month in Dewey Beach, and is warmer than the annual average of 58.5°F. Daily temperatures swing about 15.9°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
79.6°F
Avg Low
63.7°F
Precipitation
4.49 in
Daylight
12h 14m
September records in Dewey Beach
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 93.9°F (1953) | 48.9°F (1946) | 5.10 in (2002) |
| September 2 | 96.1°F (1953) | 46.0°F (1970) | 4.05 in (1956) |
| September 3 | 95.0°F (1957) | 46.9°F (1967) | 2.77 in (2020) |
| September 4 | 93.9°F (1966) | 52.0°F (1958) | 1.10 in (2020) |
| September 5 | 93.9°F (1985) | 50.0°F (1982) | 0.77 in (2006) |
| September 6 | 97.0°F (1983) | 52.0°F (1950) | 1.35 in (1955) |
| September 7 | 96.1°F (1983) | 46.0°F (1976) | 2.05 in (1957) |
| September 8 | 93.0°F (1983) | 48.0°F (1962) | 2.52 in (1969) |
| September 9 | 93.9°F (1985) | 46.0°F (1951) | 2.30 in (1977) |
| September 10 | 93.0°F (1983) | 44.1°F (1951) | 0.72 in (1976) |
| September 11 | 98.1°F (1983) | 45.0°F (1953) | 3.57 in (1954) |
| September 12 | 98.1°F (1983) | 46.9°F (1958) | 4.72 in (1960) |
| September 13 | 95.0°F (1952) | 42.1°F (1958) | 1.35 in (1950) |
| September 14 | 95.0°F (1962) | 39.0°F (1953) | 1.61 in (1973) |
| September 15 | 93.0°F (2008) | 45.0°F (1946) | 1.56 in (1951) |
| September 16 | 93.9°F (1970) | 46.0°F (1946) | 3.74 in (1999) |
| September 17 | 93.0°F (1991) | 36.0°F (2007) | 3.52 in (1995) |
| September 18 | 93.0°F (1970) | 41.0°F (1959) | 1.22 in (2023) |
| September 19 | 91.9°F (1983) | 44.1°F (1959) | 3.11 in (1981) |
| September 20 | 93.0°F (1997) | 45.0°F (1959) | 1.40 in (1961) |
| September 21 | 90.0°F (1965) | 37.9°F (1956) | 2.04 in (1966) |
| September 22 | 93.9°F (1970) | 37.9°F (1962) | 1.97 in (1994) |
| September 23 | 96.1°F (1970) | 41.0°F (1976) | 2.14 in (2023) |
| September 24 | 91.0°F (1970) | 41.0°F (1947) | 1.23 in (1946) |
| September 25 | 91.9°F (1970) | 37.0°F (1950) | 1.63 in (1947) |
| September 26 | 91.0°F (1970) | 39.9°F (1949) | 2.65 in (2000) |
| September 27 | 93.9°F (1998) | 39.9°F (1950) | 3.25 in (1985) |
| September 28 | 91.0°F (1998) | 39.9°F (1957) | 2.26 in (2009) |
| September 29 | 90.0°F (1954) | 39.9°F (1957) | 1.07 in (1963) |
| September 30 | 89.1°F (1986) | 37.9°F (1970) | 2.95 in (1964) |