September weather in Portland, AR
The average temperature in Portland in September is 75.5°F (64.2°F–86.8°F). Average precipitation: 3.41 inches.
September is a fall month in Portland, and is warmer than the annual average of 63.1°F. Daily temperatures swing about 22.6°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 12m. For travel, September is a comfortable month to visit.
Avg High
86.8°F
Avg Low
64.2°F
Precipitation
3.41 in
Daylight
12h 12m
September records in Portland
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 105.1°F (1951) | 51.1°F (1915) | 3.95 in (1921) |
| September 2 | 102.9°F (1909) | 54.0°F (1955) | 1.31 in (2008) |
| September 3 | 105.1°F (1913) | 45.0°F (2025) | 3.65 in (2008) |
| September 4 | 105.1°F (1947) | 50.0°F (1974) | 2.54 in (2008) |
| September 5 | 105.1°F (1947) | 51.1°F (1974) | 1.13 in (2023) |
| September 6 | 105.1°F (1925) | 53.1°F (2011) | 1.50 in (1959) |
| September 7 | 106.0°F (1925) | 48.0°F (1988) | 0.81 in (2024) |
| September 8 | 105.1°F (1909) | 50.0°F (1918) | 2.00 in (1999) |
| September 9 | 105.1°F (1909) | 48.0°F (2011) | 2.00 in (1949) |
| September 10 | 105.1°F (1909) | 50.0°F (2011) | 3.75 in (1965) |
| September 11 | 100.9°F (1909) | 48.0°F (1940) | 6.00 in (1958) |
| September 12 | 100.0°F (1926) | 39.9°F (1940) | 2.00 in (1958) |
| September 13 | 100.9°F (1921) | 41.0°F (1940) | 2.40 in (1945) |
| September 14 | 102.0°F (1980) | 44.1°F (1940) | 1.82 in (2008) |
| September 15 | 102.0°F (1980) | 45.0°F (1964) | 1.24 in (1913) |
| September 16 | 102.0°F (1980) | 46.0°F (1916) | 1.50 in (1957) |
| September 17 | 99.0°F (1921) | 44.1°F (1916) | 2.00 in (1942) |
| September 18 | 99.0°F (1927) | 41.0°F (1996) | 3.46 in (2021) |
| September 19 | 99.0°F (1921) | 44.1°F (1981) | 1.48 in (2009) |
| September 20 | 99.0°F (2010) | 43.0°F (1991) | 3.20 in (1958) |
| September 21 | 104.0°F (1925) | 41.0°F (1918) | 3.20 in (2013) |
| September 22 | 102.0°F (1925) | 41.0°F (1913) | 1.44 in (2021) |
| September 23 | 100.0°F (1921) | 41.0°F (1995) | 4.00 in (2020) |
| September 24 | 100.9°F (1921) | 41.0°F (1989) | 4.90 in (2005) |
| September 25 | 97.0°F (1921) | 43.0°F (1928) | 2.42 in (1925) |
| September 26 | 97.0°F (1936) | 44.1°F (1940) | 3.05 in (1921) |
| September 27 | 97.0°F (1920) | 42.1°F (1940) | 2.80 in (1996) |
| September 28 | 97.0°F (1926) | 42.1°F (1937) | 1.65 in (1964) |
| September 29 | 99.0°F (1953) | 37.9°F (1967) | 2.10 in (1980) |
| September 30 | 99.0°F (1926) | 39.9°F (1916) | 3.58 in (1934) |