Weather on September 1
Seattle, WA
55 Years of Data
Avg High
73°F
Avg Low
56°F
Warmest
1987
74°F avg
Coldest
1975
56°F avg
About This Date
September 1st in Seattle, WA typically brings pleasant fall weather, with average highs around 73°F and lows near 56°F. Over 54 years of records, the warmest September 1st was in 1987 (74°F average), while the coldest was 1975 (56°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 24% of September 1st dates historically, with the wettest September 1st recording 2.06" of rain. The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in Seattle, WA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 73° | 60° | 67° | — | — |
| 2024 | 84° | 62° | 73° | — | — |
| 2023 | 77° | 60° | 69° | — | — |
| 2022 | 77° | 60° | 69° | — | — |
| 2021 | 71° | 46° | 59° | — | — |
| 2020 | 80° | 59° | 70° | — | — |
| 2019 | 80° | 65° | 72° | — | — |
| 2018 | 72° | 59° | 65° | — | — |
| 2017 | 82° | 56° | 69° | — | — |
| 2016 | 67° | 57° | 62° | 0.13" | — |
| 2015 | 68° | 60° | 64° | 0.46" | — |
| 2014 | 77° | 58° | 67° | — | — |
| 2013 | 82° | 61° | 71° | — | — |
| 2012 | 72° | 51° | 61° | — | — |
| 2011 | 74° | 50° | 62° | — | — |
| 2010 | 72° | 59° | 65° | — | — |
| 2009 | 65° | 56° | 60° | — | — |
| 2008 | 66° | 49° | 57° | — | — |
| 2007 | 72° | 56° | 64° | — | — |
| 2006 | 85° | 55° | 70° | — | — |
| 2005 | 75° | 57° | 66° | — | — |
| 2004 | 69° | 57° | 63° | 0.84" | — |
| 2003 | 78° | 55° | 67° | — | — |
| 2002 | 71° | 58° | 64° | — | — |
| 2001 | 67° | 60° | 63° | 0.08" | — |
| 2000 | 68° | 52° | 60° | — | — |
| 1999 | 68° | 48° | 58° | — | — |
| 1997 | 80° | 59° | 70° | 0.08" | — |
| 1996 | 74° | 54° | 64° | — | — |
| 1995 | 80° | 55° | 68° | — | — |
| 1994 | 73° | 58° | 65° | — | — |
| 1993 | 79° | 57° | 68° | — | — |
| 1992 | 77° | 55° | 66° | — | — |
| 1991 | 71° | 53° | 62° | 0.13" | — |
| 1990 | 68° | 57° | 63° | 0.03" | — |
| 1989 | 69° | 56° | 62° | — | — |
| 1988 | 81° | 55° | 68° | — | — |
| 1987warmest | 88° | 61° | 74° | — | — |
| 1986 | 74° | 57° | 65° | — | — |
| 1985 | 72° | 56° | 64° | — | — |
| 1984 | 68° | 51° | 60° | — | — |
| 1983 | 67° | 60° | 63° | 1.96" | — |
| 1982 | 76° | 55° | 65° | — | — |
| 1981 | 69° | 61° | 65° | 0.23" | — |
| 1980 | 61° | 54° | 57° | 0.99" | — |
| 1979 | 72° | 61° | 66° | 0.89" | — |
| 1978 | 68° | 59° | 64° | 2.06" | — |
| 1977 | 72° | 51° | 61° | — | — |
| 1976 | 68° | 56° | 62° | — | — |
| 1975coldest | 61° | 52° | 56° | — | — |
| 1974 | 82° | 60° | 71° | — | — |
| 1973 | 73° | 48° | 61° | — | — |
| 1972 | 80° | 60° | 70° | — | — |
| 1971 | 66° | 54° | 60° | 0.97" | — |
54 years of data from SEATTLE URBAN SITE