September weather in Portland, ND
The average temperature in Portland in September is 57.2°F (44.2°F–70.1°F). Average precipitation: 2.68 inches.
September is a fall month in Portland, and is warmer than the annual average of 39.4°F. Daily temperatures swing about 25.9°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 19m. For travel, September is a comfortable month to visit.
Avg High
70.1°F
Avg Low
44.2°F
Precipitation
2.68 in
Daylight
12h 19m
September records in Portland
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 97.0°F (1983) | 33.1°F (1935) | 1.96 in (1896) |
| September 2 | 100.9°F (1983) | 30.0°F (1917) | 2.57 in (1957) |
| September 3 | 98.1°F (1925) | 30.0°F (1918) | 1.93 in (2021) |
| September 4 | 96.1°F (1970) | 26.1°F (1903) | 1.85 in (1941) |
| September 5 | 102.0°F (1978) | 33.1°F (1903) | 2.00 in (2016) |
| September 6 | 99.0°F (1976) | 30.0°F (1900) | 1.57 in (2004) |
| September 7 | 100.0°F (1931) | 30.9°F (2025) | 2.40 in (2010) |
| September 8 | 99.0°F (1931) | 30.0°F (1898) | 4.93 in (1962) |
| September 9 | 100.0°F (1931) | 27.0°F (2020) | 1.40 in (1912) |
| September 10 | 96.1°F (1952) | 21.9°F (1917) | 1.55 in (1913) |
| September 11 | 93.0°F (1948) | 26.1°F (1955) | 0.97 in (1978) |
| September 12 | 93.9°F (1931) | 27.0°F (1902) | 1.87 in (1972) |
| September 13 | 91.0°F (2017) | 21.0°F (1923) | 1.64 in (1916) |
| September 14 | 93.0°F (1927) | 26.1°F (1956) | 3.10 in (1900) |
| September 15 | 93.0°F (1927) | 26.1°F (1964) | 1.05 in (1983) |
| September 16 | 93.0°F (1979) | 27.0°F (1900) | 1.26 in (2017) |
| September 17 | 93.0°F (1979) | 24.1°F (1929) | 0.55 in (2003) |
| September 18 | 93.0°F (1914) | 15.1°F (1929) | 2.10 in (2003) |
| September 19 | 93.0°F (1914) | 19.9°F (1929) | 2.10 in (1925) |
| September 20 | 91.0°F (1914) | 21.0°F (1918) | 1.49 in (1907) |
| September 21 | 91.0°F (1908) | 24.1°F (1904) | 1.96 in (2019) |
| September 22 | 98.1°F (1936) | 21.0°F (1913) | 0.57 in (2006) |
| September 23 | 95.0°F (1936) | 23.0°F (1983) | 1.18 in (1920) |
| September 24 | 91.9°F (2007) | 25.0°F (1926) | 2.40 in (1900) |
| September 25 | 93.0°F (1938) | 17.1°F (1927) | 0.53 in (1931) |
| September 26 | 90.0°F (1963) | 19.9°F (1965) | 1.41 in (1964) |
| September 27 | 96.1°F (1952) | 21.0°F (1927) | 0.92 in (1947) |
| September 28 | 88.0°F (1952) | 19.9°F (1930) | 0.90 in (1911) |
| September 29 | 91.0°F (2021) | 21.9°F (1930) | 0.86 in (1965) |
| September 30 | 91.0°F (1976) | 19.0°F (1907) | 2.11 in (1925) |