Weather on August 18
Portland, OR
55 Years of Data
About This Date
August 18th in Portland, OR typically brings pleasant summer weather, with average highs around 79°F and lows near 58°F. Over 56 years of records, the warmest August 18th was in 2009 (78°F average), while the coldest was 1975 (60°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 13% of August 18th dates historically. The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Portland, OR? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 83° | 59° | 71° | — | — |
| 2025 | 78° | 62° | 70° | — | — |
| 2024 | 75° | 59° | 67° | 0.01" | — |
| 2023 | 79° | 58° | 68° | — | — |
| 2022 | 83° | 72° | 77° | — | — |
| 2021 | 79° | 55° | 67° | — | — |
| 2020 | 81° | 61° | 71° | — | — |
| 2019 | 74° | 56° | 65° | — | — |
| 2018 | 84° | 56° | 70° | — | — |
| 2017 | 79° | 56° | 67° | — | — |
| 2016 | 95° | 61° | 78° | — | — |
| 2015 | 93° | 63° | 78° | — | — |
| 2014 | 88° | 62° | 75° | — | — |
| 2013 | 81° | 58° | 69° | — | — |
| 2012 | 78° | 60° | 69° | — | — |
| 2011 | 80° | 54° | 67° | — | — |
| 2010 | 76° | 62° | 69° | — | — |
| 2009warmest | 92° | 65° | 78° | — | — |
| 2008 | 72° | 61° | 66° | 0.22" | — |
| 2007 | 74° | 57° | 65° | — | — |
| 2006 | 90° | 58° | 74° | — | — |
| 2005 | 83° | 59° | 71° | — | — |
| 2004 | 86° | 64° | 75° | — | — |
| 2003 | 86° | 62° | 74° | — | — |
| 2002 | 81° | 54° | 67° | — | — |
| 2001 | 71° | 58° | 64° | — | — |
| 2000 | 70° | 56° | 63° | 0.15" | — |
| 1999 | 74° | 61° | 67° | — | — |
| 1998 | 71° | 53° | 62° | — | — |
| 1997 | 73° | 62° | 68° | — | — |
| 1996 | 70° | 53° | 61° | — | — |
| 1995 | 76° | 53° | 64° | — | — |
| 1994 | 80° | 57° | 69° | — | — |
| 1993 | 85° | 55° | 70° | — | — |
| 1992 | 85° | 59° | 72° | — | — |
| 1991 | 85° | 62° | 73° | 0.05" | — |
| 1990 | 76° | 57° | 66° | — | — |
| 1989 | 83° | 59° | 71° | — | — |
| 1988 | 75° | 52° | 63° | — | — |
| 1987 | 83° | 57° | 70° | — | — |
| 1986 | 78° | 56° | 67° | — | — |
| 1985 | 72° | 58° | 65° | — | — |
| 1984 | 77° | 60° | 69° | — | — |
| 1983 | 81° | 55° | 68° | — | — |
| 1982 | 84° | 58° | 71° | — | — |
| 1981 | 92° | 62° | 77° | — | — |
| 1980 | 74° | 55° | 64° | — | — |
| 1979 | 71° | 59° | 65° | 0.12" | — |
| 1978 | 76° | 58° | 67° | — | — |
| 1977 | 82° | 60° | 71° | — | — |
| 1976 | 78° | 53° | 66° | — | — |
| 1975coldest | 62° | 57° | 60° | 0.15" | — |
| 1974 | 67° | 57° | 62° | 0.06" | — |
| 1973 | 75° | 46° | 61° | — | — |
| 1972 | 82° | 54° | 68° | — | — |
| 1971 | 83° | 59° | 71° | — | — |
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 August 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.
August 18th outlook →