Weather on September 1
Bellevue, WA
55 Years of Data
Avg High
73°F
Avg Low
55°F
Warmest
1987
74°F avg
Coldest
1973
55°F avg
About This Date
September 1st in Bellevue, WA typically brings pleasant fall weather, with average highs around 73°F and lows near 55°F. Over 54 years of records, the warmest September 1st was in 1987 (74°F average), while the coldest was 1973 (55°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 28% of September 1st dates historically, with the wettest September 1st recording 1.96" of rain. The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in Bellevue, WA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 59° | 67° | — | — |
| 2024 | 85° | 60° | 72° | — | — |
| 2023 | 79° | 60° | 69° | — | — |
| 2022 | 78° | 59° | 69° | — | — |
| 2021 | 71° | 49° | 60° | — | — |
| 2020 | 82° | 59° | 71° | — | — |
| 2019 | 79° | 62° | 70° | — | — |
| 2018 | 73° | 58° | 65° | — | — |
| 2017 | 83° | 56° | 69° | — | — |
| 2016 | 67° | 57° | 62° | 0.13" | — |
| 2015 | 65° | 59° | 62° | 0.33" | — |
| 2014 | 75° | 59° | 67° | — | — |
| 2013 | 80° | 58° | 69° | — | — |
| 2012 | 74° | 49° | 61° | — | — |
| 2011 | 75° | 50° | 63° | — | — |
| 2010 | 69° | 57° | 63° | 0.03" | — |
| 2009 | 68° | 56° | 62° | 0.05" | — |
| 2008 | 66° | 50° | 58° | — | — |
| 2007 | 74° | 54° | 64° | — | — |
| 2006 | 85° | 53° | 69° | — | — |
| 2005 | 76° | 55° | 65° | — | — |
| 2004 | 69° | 55° | 62° | 0.86" | — |
| 2003 | 76° | 50° | 63° | — | — |
| 2002 | 69° | 59° | 64° | — | — |
| 2001 | 67° | 59° | 63° | 0.05" | — |
| 2000 | 68° | 53° | 61° | — | — |
| 1999 | 69° | 48° | 59° | — | — |
| 1997 | 76° | 58° | 67° | 0.08" | — |
| 1996 | 73° | 55° | 64° | — | — |
| 1995 | 78° | 54° | 66° | — | — |
| 1994 | 72° | 57° | 64° | — | — |
| 1993 | 78° | 57° | 68° | — | — |
| 1992 | 76° | 55° | 65° | — | — |
| 1991 | 70° | 55° | 62° | — | — |
| 1990 | 68° | 57° | 63° | 0.03" | — |
| 1989 | 65° | 54° | 59° | 0.79" | — |
| 1988 | 81° | 56° | 68° | — | — |
| 1987warmest | 87° | 61° | 74° | — | — |
| 1986 | 74° | 57° | 65° | — | — |
| 1985 | 72° | 56° | 64° | — | — |
| 1984 | 68° | 51° | 60° | — | — |
| 1983 | 67° | 60° | 63° | 1.96" | — |
| 1982 | 80° | 54° | 67° | — | — |
| 1981 | 69° | 59° | 64° | 0.48" | — |
| 1980 | 68° | 52° | 60° | 0.3" | — |
| 1979 | 77° | — | — | 0.51" | — |
| 1978 | 67° | 58° | 62° | 1.65" | — |
| 1977 | 74° | 49° | 61° | — | — |
| 1976 | 77° | 55° | 66° | — | — |
| 1975 | 67° | 52° | 59° | — | — |
| 1974 | 71° | 57° | 64° | — | — |
| 1973coldest | 63° | 48° | 55° | — | — |
| 1972 | 81° | 54° | 67° | — | — |
| 1971 | 64° | 53° | 59° | 0.2" | — |
54 years of data from SEATTLE UNIV OF WASHIN