September weather in Smyrna, DE
The average temperature in Smyrna in September is 70.1°F (61.0°F–79.2°F). Average precipitation: 4.25 inches.
September is a fall month in Smyrna, and is warmer than the annual average of 57.1°F. Daily temperatures swing about 18.2°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
79.2°F
Avg Low
61.0°F
Precipitation
4.25 in
Daylight
12h 15m
September records in Smyrna
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (1953) | 50.0°F (1946) | 2.98 in (1940) |
| September 2 | 98.1°F (1921) | 48.0°F (1970) | 2.93 in (1972) |
| September 3 | 97.0°F (1921) | 48.0°F (1967) | 4.15 in (1969) |
| September 4 | 95.0°F (1957) | 48.0°F (1908) | 1.47 in (1974) |
| September 5 | 95.0°F (1941) | 48.9°F (1997) | 6.00 in (1969) |
| September 6 | 96.1°F (1910) | 46.0°F (1924) | 4.81 in (1935) |
| September 7 | 96.1°F (2023) | 45.0°F (1924) | 3.10 in (1977) |
| September 8 | 97.0°F (2023) | 30.0°F (1924) | 3.13 in (1934) |
| September 9 | 95.0°F (2016) | 42.1°F (1914) | 2.48 in (2018) |
| September 10 | 97.0°F (1941) | 39.9°F (1914) | 1.66 in (2015) |
| September 11 | 98.1°F (1931) | 41.0°F (1924) | 3.56 in (2009) |
| September 12 | 97.0°F (1931) | 45.0°F (1967) | 6.33 in (1960) |
| September 13 | 93.0°F (1925) | 44.1°F (1958) | 2.40 in (1930) |
| September 14 | 93.9°F (1915) | 43.0°F (1911) | 3.35 in (1971) |
| September 15 | 95.0°F (1927) | 43.0°F (1975) | 2.26 in (1893) |
| September 16 | 93.9°F (1970) | 44.1°F (1984) | 4.55 in (1999) |
| September 17 | 95.0°F (1991) | 43.0°F (1923) | 2.47 in (1999) |
| September 18 | 91.9°F (1991) | 39.9°F (1959) | 2.00 in (1936) |
| September 19 | 93.9°F (1977) | 41.0°F (1943) | 3.20 in (1971) |
| September 20 | 91.9°F (1977) | 42.1°F (1920) | 2.60 in (1938) |
| September 21 | 95.0°F (1931) | 39.9°F (1956) | 2.26 in (1938) |
| September 22 | 97.0°F (1931) | 39.0°F (1962) | 1.77 in (1979) |
| September 23 | 96.1°F (1970) | 34.0°F (1924) | 1.88 in (1975) |
| September 24 | 95.0°F (2010) | 37.9°F (1963) | 2.06 in (1975) |
| September 25 | 95.0°F (1970) | 37.9°F (1963) | 2.42 in (1980) |
| September 26 | 93.9°F (1970) | 39.0°F (1950) | 3.17 in (1992) |
| September 27 | 91.0°F (1970) | 39.0°F (1947) | 5.30 in (1985) |
| September 28 | 89.1°F (1921) | 33.1°F (1947) | 2.00 in (1907) |
| September 29 | 90.0°F (1921) | 33.1°F (1947) | 3.89 in (2016) |
| September 30 | 91.0°F (1921) | 37.9°F (1970) | 3.33 in (2016) |