Weather on September 18
Portland, OR
55 Years of Data
About This Date
September 18th in Portland, OR typically brings pleasant fall weather, with average highs around 72°F and lows near 54°F. Over 55 years of records, the warmest September 18th was in 1991 (76°F average), while the coldest was 2004 (53°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 38% of September 18th dates historically, with the wettest September 18th recording 1.4" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 18th in Portland, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 58° | 67° | — | — |
| 2024 | 68° | 58° | 63° | — | — |
| 2023 | 71° | 57° | 64° | — | — |
| 2022 | 77° | 55° | 66° | — | — |
| 2021 | 70° | 55° | 62° | 1.4" | — |
| 2020 | 66° | 59° | 63° | 0.32" | — |
| 2019 | 64° | 53° | 59° | 0.52" | — |
| 2018 | 69° | 49° | 59° | — | — |
| 2017 | 59° | 51° | 55° | 0.44" | — |
| 2016 | 70° | 54° | 62° | 0.04" | — |
| 2015 | 74° | 52° | 63° | — | — |
| 2014 | 71° | 60° | 66° | 0.15" | — |
| 2013 | 71° | 55° | 63° | — | — |
| 2012 | 87° | 57° | 72° | — | — |
| 2011 | 64° | 57° | 61° | 0.02" | — |
| 2010 | 67° | 57° | 62° | 1" | — |
| 2009 | 87° | 53° | 70° | — | — |
| 2008 | 63° | 57° | 60° | — | — |
| 2007 | 65° | 48° | 56° | — | — |
| 2006 | 73° | 57° | 65° | 0.25" | — |
| 2005 | 73° | 44° | 59° | — | — |
| 2004coldest | 56° | 50° | 53° | 0.76" | — |
| 2003 | 74° | 48° | 61° | — | — |
| 2002 | 75° | 50° | 63° | — | — |
| 2001 | 69° | 55° | 62° | — | — |
| 2000 | 82° | 59° | 71° | — | — |
| 1999 | 88° | 56° | 72° | — | — |
| 1998 | 69° | 57° | 63° | 0.63" | — |
| 1997 | 68° | 55° | 62° | 0.26" | — |
| 1996 | 64° | 48° | 56° | 0.02" | — |
| 1995 | 75° | 55° | 65° | — | — |
| 1994 | 79° | 57° | 68° | — | — |
| 1993 | 65° | 48° | 56° | — | — |
| 1992 | 79° | 53° | 66° | — | — |
| 1991warmest | 90° | 62° | 76° | — | — |
| 1990 | 77° | 55° | 66° | — | — |
| 1989 | 69° | 45° | 57° | — | — |
| 1988 | 68° | 44° | 56° | 0.13" | — |
| 1987 | 77° | 53° | 65° | — | — |
| 1986 | 67° | 50° | 58° | — | — |
| 1985 | 66° | 47° | 56° | 0.01" | — |
| 1984 | 81° | 61° | 71° | — | — |
| 1983 | 64° | 47° | 55° | 0.07" | — |
| 1982 | 79° | 54° | 66° | — | — |
| 1981 | 78° | 56° | 67° | 0.23" | — |
| 1980 | 62° | 54° | 58° | 0.38" | — |
| 1979 | 85° | 58° | 71° | — | — |
| 1978 | 67° | 46° | 56° | — | — |
| 1977 | 63° | 55° | 59° | 0.32" | — |
| 1976 | 73° | 52° | 62° | — | — |
| 1975 | 78° | 51° | 65° | — | — |
| 1974 | 87° | 59° | 73° | — | — |
| 1973 | 69° | 57° | 63° | 0.06" | — |
| 1972 | 61° | 51° | 56° | 0.5" | — |
| 1971 | 80° | 56° | 68° | — | — |
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
Most pleasant months in Portland, OR: May, June, July, August, September.
What to expect on September 18th
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
September 18th outlook →