Climate and Weather in Seattle
In Seattle, the summers are short, warm, dry, and partly cloudy and the winters are very cold, wet, and mostly cloudy. Over the course of the year, the temperature typically varies from 0°c to 30°c and is rarely below -5°F or above 35°F.
The best time of year to visit Seattle for warm-weather activities is from July to late August.
Warmest Season in Seattle
The warm season lasts for 2.8 months, from June to September , with an average daily high temperature above 22°c. The hottest days of the year are in August , with an average high of 26°c and low of 15°F.
Coolest Season in Seattle
The cool season lasts for 3.6 months, from November to March, with an average daily high temperature below 11°c. The coldest days of the year are in December, with an average low of 2.7°c and high of 7.7°c.
Cloudy Season in Seattle
In Seattle, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.The clearer part of the year in Seattle begins around June and lasts for 3.8 months, ending around October. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 25% of the time. The cloudier part of the year begins around October and lasts for 8.2 months, ending around June. On January 19, the cloudiest day of the year, the sky is overcast or mostly cloudy 72% of the time, and clear, mostly clear, or partly cloudy 28% of the time.