Weather on September 30
Portland, OR
55 Years of Data
Avg High
70°F
Avg Low
52°F
Warmest
1975
70°F avg
Coldest
2019
49°F avg
About This Date
September 30th in Portland, OR typically brings pleasant fall weather, with average highs around 70°F and lows near 52°F. Over 55 years of records, the warmest September 30th was in 1975 (70°F average), while the coldest was 2019 (49°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 31% of September 30th dates historically, with the wettest September 30th recording 3.25" of rain. The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
Planning for September 30th in Portland, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 51° | 60° | 0.23" | — |
| 2024 | 72° | 46° | 59° | — | — |
| 2023 | 65° | 49° | 57° | — | — |
| 2022 | 70° | 55° | 62° | — | — |
| 2021 | 61° | 53° | 57° | 0.18" | — |
| 2020 | 82° | 56° | 69° | — | — |
| 2019coldest | 58° | 41° | 49° | — | — |
| 2018 | 68° | 52° | 60° | 0.05" | — |
| 2017 | 64° | 49° | 56° | 0.3" | — |
| 2016 | 69° | 47° | 58° | — | — |
| 2015 | 71° | 51° | 61° | — | — |
| 2014 | 67° | 53° | 60° | 0.13" | — |
| 2013 | 59° | 51° | 55° | 0.69" | — |
| 2012 | 72° | 49° | 60° | — | — |
| 2011 | 72° | 55° | 63° | — | — |
| 2010 | 84° | 55° | 70° | — | — |
| 2009 | 60° | 47° | 53° | 0.08" | — |
| 2008 | 77° | 57° | 67° | — | — |
| 2007 | 55° | 50° | 53° | 1.75" | — |
| 2006 | 71° | 51° | 61° | — | — |
| 2005 | 65° | — | — | 3.25" | — |
| 2004 | 70° | 56° | 63° | — | — |
| 2003 | 71° | 55° | 63° | — | — |
| 2002 | 59° | 47° | 53° | 0.97" | — |
| 2001 | 76° | 48° | 62° | — | — |
| 2000 | 67° | 63° | 65° | 1.73" | — |
| 1999 | 62° | 48° | 55° | — | — |
| 1998 | 81° | 54° | 67° | — | — |
| 1997 | 66° | 60° | 63° | 0.64" | — |
| 1996 | 69° | 55° | 62° | — | — |
| 1995 | 67° | 54° | 60° | 0.41" | — |
| 1994 | 67° | 59° | 63° | — | — |
| 1993 | 79° | 55° | 67° | — | — |
| 1992 | 82° | 55° | 69° | — | — |
| 1991 | 84° | 56° | 70° | — | — |
| 1990 | 74° | 55° | 64° | — | — |
| 1989 | 62° | 56° | 59° | 1.65" | — |
| 1988 | 81° | 59° | 70° | — | — |
| 1987 | 86° | 54° | 70° | — | — |
| 1986 | 56° | 50° | 53° | — | — |
| 1985 | 74° | 45° | 59° | — | — |
| 1984 | 67° | 53° | 60° | — | — |
| 1983 | 73° | 42° | 58° | — | — |
| 1982 | 72° | 44° | 58° | — | — |
| 1981 | 71° | 45° | 58° | — | — |
| 1980 | 73° | 58° | 65° | — | — |
| 1979 | 74° | 53° | 63° | — | — |
| 1978 | 67° | 57° | 62° | 0.05" | — |
| 1977 | 64° | 50° | 57° | 1.45" | — |
| 1976 | 76° | 58° | 67° | — | — |
| 1975warmest | 86° | 54° | 70° | — | — |
| 1974 | 76° | 48° | 62° | — | — |
| 1973 | 63° | 46° | 54° | — | — |
| 1972 | 75° | 48° | 62° | — | — |
| 1971 | 60° | 43° | 51° | 0.03" | — |
55 years of data from PORTLAND KGW-TV