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When is the best time to visit Seattle?
In general the best time to visit Seattle is probably August, when the weather is usually great. The hottest months are July, August, September, while the coldest months are January, February, December.
Depending on the activities you want to experience, you may choose different months to visit:
- In general, it’s pleasant to walk and do outdoor activities during May - September.
- If you want to avoid wet weather, then your choice is January, November, December with the lowest chance of rain.
Average weather in Seattle in different months
This is the average weather in Seattle for each month based on historic data:
June, July, August usually has good weather. Average maximum temperature reaches +75°F during July.
In February, March, April, May, September, October the weather is average. Expect around 106 rainy days, and the precipitation amounts to approximately 122 mm in March.
January, November, December bring not the best weather. January is the coldest month with the temperature going down to +39°F.
Climate in Seattle
Here is the detailed breakdown of the climate in Seattle for each month:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum Temperature | |||||||||||
| +59°F | +63°F | +79°F | +81°F | +88°F | +104°F | +95°F | +97°F | +91°F | +84°F | +64°F | +59°F |
| Average Maximum Temperature | |||||||||||
| +46°F | +48°F | +54°F | +57°F | +64°F | +68°F | +75°F | +75°F | +70°F | +59°F | +50°F | +45°F |
| Minimum Temperature | |||||||||||
| +14°F | +10°F | +21°F | +34°F | +37°F | +41°F | +48°F | +46°F | +41°F | +32°F | +12°F | +9°F |
| Avg. water temperature | |||||||||||
| +47°F | +47°F | +48°F | +47°F | +49°F | +50°F | +53°F | +55°F | +55°F | +53°F | +50°F | +48°F |
| Humidity, % | |||||||||||
| 86 | 83 | 79 | 76 | 75 | 73 | 70 | 71 | 76 | 82 | 85 | 86 |
| Rain, mm | |||||||||||
| 173 | 116 | 122 | 97 | 71 | 56 | 28 | 29 | 62 | 114 | 177 | 166 |
| Snow, mm | |||||||||||
| 6 | 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 7 |
| Average wind speed, m/s | |||||||||||
| 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 |
| Sunny Days | |||||||||||
| 2 | 2 | 2 | 2 | 3 | 4 | 10 | 9 | 7 | 3 | 1 | 1 |
| Cloud Days | |||||||||||
| 8 | 7 | 8 | 8 | 11 | 12 | 12 | 13 | 10 | 10 | 7 | 8 |
| Rainy Days | |||||||||||
| 19 | 17 | 21 | 20 | 17 | 14 | 9 | 9 | 13 | 18 | 21 | 20 |
| Snowy Days | |||||||||||
| 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
Average Temperature
Here are the average maximum and minimum temperatures in Seattle during the whole year:
The hottest month in Seattle is August with average maximum temperature going up to +75°F. The coldest month is December with the lowest temperatures of +39°F.
Water temperature
Here are the water temperatures in Seattle during the whole year:
Seattle achieves its warmest water temperature in August, where the average sea temperature goes up to +53°F. Coldest water temperature is in February with +45°F in average.
Humidity
The temperature feels different depending on humidity. Here is how humidity in Seattle looks throughout the year, in %:
The most humid month in Seattle is December with average humidity going up to 86%. The least humid month is July with an average humidity of 70%.
Rain
Amount of rainfall in mm. in Seattle during the whole year based on historical data:
The sunniest and driest month is July with approximately 10 sunny days and a total precipitation of around 28 mm. The rainiest and wettest month is November with approximately 21 rainy days and 177 mm of total precipitation.
Snow
Amount of snow in mm. in Seattle during the whole year based on historical data:
The snowiest month is December with approximately 2 snowy days.
FAQ
Frequently asked questions about the weather in Seattle:
What is the hottest month in Seattle?
The hottest month in Seattle is August with average maximum temperature of +75°F.
What is the coldest month in Seattle?
The coldest month in Seattle is December with minimum temperatures of +39°F.
Is Seattle worth visiting in winter?
Winter is usually not the best time to go to Seattle.
When does it rain the least in Seattle?
if you're looking to visit Seattle when it rains the least, you should plan your trip for November, January, December. During this time, rainfall is rare with the driest month being July with only 28 mm of rain.
Other cities in USA
Check out the weather for other cities in USA.
Monthly weather in Seattle
Source of the data
For this page, we’ve looked at the typical weather in Seattle, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.