September weather in Portsmouth, VA
The average temperature in Portsmouth in September is 73.7°F (66.7°F–80.8°F). Average precipitation: 5.14 inches.
September is a fall month in Portsmouth, and is warmer than the annual average of 61.4°F. Daily temperatures swing about 14.1°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 13m. For travel, September is a wet month.
Avg High
80.8°F
Avg Low
66.7°F
Precipitation
5.14 in
Daylight
12h 13m
September records in Portsmouth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 98.1°F (1993) | 60.1°F (1946) | 6.50 in (2006) |
| September 2 | 98.1°F (1993) | 59.0°F (2023) | 0.99 in (1972) |
| September 3 | 96.1°F (1993) | 59.0°F (1958) | 4.07 in (2003) |
| September 4 | 95.0°F (1985) | 59.0°F (1967) | 1.81 in (1993) |
| September 5 | 95.0°F (1985) | 60.1°F (1972) | 7.92 in (1979) |
| September 6 | 95.0°F (1954) | 61.0°F (1963) | 2.75 in (1987) |
| September 7 | 100.0°F (1954) | 57.9°F (1963) | 0.91 in (2009) |
| September 8 | 96.1°F (1954) | 57.0°F (2024) | 2.93 in (2009) |
| September 9 | 93.9°F (1985) | 55.0°F (2024) | 1.80 in (2014) |
| September 10 | 95.0°F (1985) | 55.9°F (1972) | 1.80 in (2018) |
| September 11 | 99.0°F (2007) | 51.1°F (1972) | 1.70 in (1971) |
| September 12 | 91.9°F (1957) | 55.0°F (1993) | 3.82 in (1960) |
| September 13 | 93.0°F (2008) | 55.9°F (1958) | 3.76 in (1964) |
| September 14 | 95.0°F (1995) | 55.0°F (1958) | 1.51 in (1990) |
| September 15 | 91.9°F (1993) | 55.9°F (2015) | 5.47 in (1963) |
| September 16 | 93.0°F (1991) | 57.9°F (2015) | 1.78 in (1949) |
| September 17 | 93.9°F (2005) | 55.9°F (1966) | 1.80 in (2020) |
| September 18 | 96.1°F (1978) | 53.1°F (1986) | 4.21 in (2003) |
| September 19 | 96.1°F (1978) | 55.9°F (1990) | 2.81 in (2016) |
| September 20 | 91.9°F (1997) | 53.1°F (2019) | 2.65 in (2016) |
| September 21 | 91.9°F (1965) | 55.0°F (1956) | 4.72 in (1972) |
| September 22 | 98.1°F (1980) | 37.9°F (2011) | 1.84 in (1979) |
| September 23 | 91.9°F (1970) | 37.9°F (2011) | 2.65 in (1979) |
| September 24 | 96.1°F (2010) | -26.9°F (2011) | 2.63 in (1947) |
| September 25 | 93.9°F (2010) | -28.8°F (2011) | 2.59 in (2008) |
| September 26 | 93.0°F (1970) | -16.8°F (2011) | 2.54 in (1985) |
| September 27 | 91.0°F (1970) | -24.9°F (2011) | 2.61 in (1985) |
| September 28 | 89.1°F (2019) | 51.1°F (1991) | 3.91 in (1959) |
| September 29 | 89.1°F (1973) | 52.0°F (1991) | 2.23 in (1946) |
| September 30 | 89.1°F (1954) | 50.0°F (1962) | 9.26 in (2010) |