Weather on September 15
Portland, OR
55 Years of Data
About This Date
September 15th in Portland, OR typically brings pleasant fall weather, with average highs around 74°F and lows near 55°F. Over 55 years of records, the warmest September 15th was in 1981 (77°F average), while the coldest was 1996 (53°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 15th dates historically, with the wettest September 15th recording 3.76" of rain. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for September 15th in Portland, OR? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 50° | 62° | — | — |
| 2024 | 64° | 50° | 57° | — | — |
| 2023 | 93° | 58° | 75° | — | — |
| 2022 | 73° | 60° | 67° | — | — |
| 2021 | 70° | 55° | 62° | — | — |
| 2020 | 75° | 60° | 68° | — | — |
| 2019 | 65° | 57° | 61° | 2.34" | — |
| 2018 | 65° | 52° | 58° | — | — |
| 2017 | 79° | 52° | 65° | — | — |
| 2016 | 77° | 53° | 65° | — | — |
| 2015 | 62° | 49° | 55° | — | — |
| 2014 | 90° | 58° | 74° | — | — |
| 2013 | 66° | 60° | 63° | 0.05" | — |
| 2012 | 79° | 54° | 66° | — | — |
| 2011 | 67° | 55° | 61° | — | — |
| 2010 | 72° | 57° | 64° | 0.51" | — |
| 2009 | 84° | 58° | 71° | — | — |
| 2008 | 89° | 59° | 74° | — | — |
| 2007 | 69° | 56° | 62° | — | — |
| 2006 | 64° | 49° | 56° | 0.89" | — |
| 2005 | 67° | 56° | 61° | — | — |
| 2004 | 71° | 56° | 63° | 0.2" | — |
| 2003 | 66° | 48° | 57° | — | — |
| 2002 | 67° | 57° | 62° | — | — |
| 2001 | 81° | 62° | 71° | — | — |
| 2000 | 73° | 64° | 69° | — | — |
| 1999 | 71° | 56° | 63° | — | — |
| 1998 | 88° | 58° | 73° | — | — |
| 1997 | 61° | 56° | 58° | 0.56" | — |
| 1996coldest | 64° | 42° | 53° | 3.76" | — |
| 1995 | 78° | 60° | 69° | — | — |
| 1994 | 79° | 58° | 68° | — | — |
| 1993 | 70° | 56° | 63° | — | — |
| 1992 | 60° | 50° | 55° | 1.35" | — |
| 1991 | 82° | 55° | 69° | — | — |
| 1990 | 64° | 57° | 61° | 1.14" | — |
| 1989 | 81° | 55° | 68° | — | — |
| 1988 | 64° | 50° | 57° | — | — |
| 1987 | 64° | 49° | 56° | 0.03" | — |
| 1986 | 68° | 51° | 60° | 0.38" | — |
| 1985 | 66° | 53° | 60° | 0.56" | — |
| 1984 | 78° | 56° | 67° | — | — |
| 1983 | 78° | 55° | 67° | — | — |
| 1982 | 75° | 48° | 62° | — | — |
| 1981warmest | 96° | 58° | 77° | — | — |
| 1980 | 81° | 53° | 67° | — | — |
| 1979 | 74° | 56° | 65° | — | — |
| 1978 | 70° | 55° | 62° | — | — |
| 1977 | 67° | 54° | 60° | — | — |
| 1976 | 73° | 54° | 63° | — | — |
| 1975 | 79° | 56° | 67° | — | — |
| 1974 | 81° | 54° | 67° | — | — |
| 1973 | 74° | 50° | 62° | — | — |
| 1972 | 82° | 57° | 70° | — | — |
| 1971 | 79° | 51° | 65° | — | — |
Portland, OR Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Portland, OR Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Portland, OR Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Portland, OR
Portland, OR has no months that meet our "pleasant" threshold — every season has tradeoffs.