September weather in Portland, IN
The average temperature in Portland in September is 64.4°F (52.3°F–76.5°F). Average precipitation: 2.97 inches.
September is a fall month in Portland, and is warmer than the annual average of 50.3°F. Daily temperatures swing about 24.2°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 15m. For travel, September is one of the best months of the year to visit.
Avg High
76.5°F
Avg Low
52.3°F
Precipitation
2.97 in
Daylight
12h 15m
September records in Portland
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 96.1°F (2024) | 43.0°F (2009) | 2.18 in (2003) |
| September 2 | 95.0°F (2011) | 44.1°F (1994) | 1.66 in (1961) |
| September 3 | 96.1°F (2011) | 44.1°F (1994) | 1.51 in (1993) |
| September 4 | 96.1°F (2011) | 37.9°F (1997) | 1.50 in (2022) |
| September 5 | 91.9°F (1999) | 41.0°F (1997) | 1.10 in (1968) |
| September 6 | 91.0°F (1999) | 39.9°F (1976) | 1.06 in (1951) |
| September 7 | 91.9°F (1990) | 39.9°F (1988) | 2.95 in (2020) |
| September 8 | 91.9°F (1985) | 37.0°F (2024) | 2.65 in (2012) |
| September 9 | 91.0°F (1999) | 37.9°F (2024) | 1.03 in (2018) |
| September 10 | 91.9°F (1983) | 41.0°F (1986) | 1.83 in (2001) |
| September 11 | 96.1°F (1983) | 37.0°F (1995) | 2.78 in (2014) |
| September 12 | 95.0°F (2013) | 37.9°F (1995) | 2.75 in (1972) |
| September 13 | 89.1°F (1999) | 39.9°F (1970) | 1.46 in (1988) |
| September 14 | 93.9°F (1991) | 37.9°F (1985) | 2.19 in (1977) |
| September 15 | 91.0°F (1991) | 37.9°F (1985) | 1.93 in (1965) |
| September 16 | 91.0°F (1991) | 37.9°F (1984) | 1.14 in (2005) |
| September 17 | 89.1°F (1970) | 37.0°F (1984) | 3.00 in (1969) |
| September 18 | 88.0°F (2021) | 37.0°F (2020) | 1.45 in (1969) |
| September 19 | 91.0°F (2018) | 37.0°F (2020) | 2.98 in (1952) |
| September 20 | 90.0°F (1983) | 34.0°F (1991) | 1.55 in (1966) |
| September 21 | 90.0°F (2024) | 33.1°F (1991) | 1.56 in (2021) |
| September 22 | 91.9°F (2017) | 32.0°F (1991) | 2.12 in (1950) |
| September 23 | 91.0°F (2017) | 28.0°F (1995) | 0.54 in (2011) |
| September 24 | 91.0°F (2010) | 28.9°F (1983) | 1.00 in (1972) |
| September 25 | 91.9°F (2007) | 28.9°F (1983) | 1.72 in (1961) |
| September 26 | 91.0°F (2017) | 34.0°F (1989) | 1.60 in (2005) |
| September 27 | 90.0°F (1998) | 35.1°F (1991) | 1.05 in (1972) |
| September 28 | 88.0°F (1998) | 33.1°F (1989) | 1.50 in (2023) |
| September 29 | 88.0°F (1998) | 33.1°F (1989) | 0.75 in (1999) |
| September 30 | 89.1°F (2019) | 30.9°F (1993) | 1.23 in (1955) |