The summary climate graph for Seattle, WA shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.
The warmest month in Seattle Tacoma International, Seattle, Washington is July with an average high temperature of 77.0°F. The hottest day on record was July 30 2009 when the temperature hit 102.9°F. During January the overnight temperature drops to an average of 34.7°F with the lowest temperature of 0.3°F being recorded on January 31 1950.
The warmest days on record are:
| 30 Jul 2009 | 102.9°F |
| 21 Jul 1994 | 100°F |
| 9 Aug 1960 | 99.3°F |
| 10 Aug 1981 | 99°F |
| 16 Aug 1967 | 98.4°F |
The warmest months on average were:
| August 1967 | 85.9°F |
| July 1958 | 84.3°F |
| July 2009 | 83.4°F |
| July 1985 | 83°F |
| August 1986 | 82.2°F |
The coldest days on record are:
| 31 Jan 1950 | 0.3°F |
| 1 Feb 1950 | 1.4°F |
| 15 Nov 1955 | 6.4°F |
| 30 Dec 1968 | 6.4°F |
| 5 Feb 1989 | 6.8°F |
The coldest months on average were:
| January 1950 | 18.9°F |
| January 1949 | 22.9°F |
| February 1989 | 26.7°F |
| January 1957 | 27.4°F |
| December 1990 | 28.9°F |
The wettest month by average rainfall in Seattle, WA is November with an average of 6.2 inches of rain falling on 19 to 20 days.Although in December it typically rains on more days with 5.7 inches falling in 19 to 20 days. The driest month in Seattle, WA is July with an average of 0.8 inches of rain falling on 7 to 8 days.
The wettest days on record are:
| 2 September 1978 | 12.1 inches |
| 18 September 2010 | 1.8 inches |
| 30 September 1953 | 1.7 inches |
| 26 September 1948 | 1.5 inches |
| 22 September 1969 | 1.3 inches |
The wettest months on record are:
| May 1973 | 19.2 inches |
| September 1978 | 18.4 inches |
| November 2006 | 15.6 inches |
| January 1953 | 13.1 inches |
| February 1973 | 12.6 inches |
The driest months on record are:
| July 1960 | 0 inches |
| July 1958 | 0 inches |
| August 2012 | 0 inches |
| July 1967 | 0 inches |
| August 1974 | 0 inches |