King County (Seattle)
May
Weather in King County, Washington for May 2026
Your guide to King County weather in May - trends and predictions
The forecast for the upcoming days in King County predicts a temperature of 20.4 °F, which is slightly above the historical average.
In general, the average temperature in King County at the beginning of May is 16.6 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 18.9 °F by the end of May.
King County experiences heavy rainfall in May, with over 20 rainy days and an average total precipitation 76.9 mm.
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Temperatures
Rain 🌧️
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8
Dry days
23
Rainy days
0
Snow days
17°/8°
Temperatures
12 km/h
Avg max wind
71 %
Avg humidity
King County Weather May
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Temperatures trend during May in King County
See the weather trend as well as the moving average line
May weather in King County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 17° /6° | 1 mm | 4 | |
| May 2 |  Cloudy | 18° /7° | 1.9 mm | 5 | |
| May 3 |  Moderate rain at times | 18° /7° | 1.4 mm | 4 | |
| May 4 | Patchy rain possible | 17° /7° | 1 mm | 4 | |
| May 5 | Moderate or heavy rain shower | 16° /6° | 6.2 mm | 4 | |
| May 6 | Patchy rain possible | 16° /7° | 3.6 mm | 4 | |
| May 7 |  Overcast | 14° /7° | 5.1 mm | 4 | |
| May 8 |  Sunny | 21° /8° | 0 mm | 5.9 | |
| May 9 |  Partly cloudy | 22° /7° | 0 mm | 5.8 | |
| May 10 | Partly cloudy | 21° /9° | 0 mm | 5.3 | |
| May 11 | Sunny | 21° /9° | 0 mm | 6.4 | |
| May 12 | Partly cloudy | 23° /9° | 0 mm | 0 | |
| May 13 | Partly cloudy | 28° /11° | 0 mm | 5 | |
| May 14 | Partly cloudy | 25° /13° | 0 mm | 5 | |
| May 15 | Patchy rain possible | 15° /10° | 0.3 mm | 3 | |
| May 16 | Cloudy | 17° /7° | 0 mm | 3 | |
| May 17 | Partly cloudy | 16° /7° | 0 mm | 4 | |
| May 18 | Overcast | 19° /4° | 0 mm | 3 | |
| May 19 | Patchy rain possible | 20° /10° | 0.4 mm | 3 | |
| May 20 | Patchy rain possible | 19° /9° | 0.2 mm | 3 | |
| May 21 | Overcast | 19° /7° | 0 mm | 3 | |
| May 22 | Overcast | 18° /7° | 3.4 mm | 4 | |
| May 23 | Overcast | 17° /8° | 0.6 mm | 4 | |
| May 24 | Moderate rain at times | 19° /7° | 1.4 mm | 5 | |
| May 25 | Patchy rain possible | 19° /9° | 1.7 mm | 4 | |
| May 26 | Partly cloudy | 19° /9° | 1.1 mm | 5 | |
| May 27 | Moderate or heavy rain shower | 19° /8° | 3.8 mm | 5 | |
| May 28 | Patchy rain possible | 18° /9° | 1.9 mm | 5 | |
| May 29 | Partly cloudy | 18° /8° | 3.8 mm | 4 | |
| May 30 | Patchy rain possible | 19° /7° | 0.6 mm | 5 | |
| May 31 | Overcast | 20° /8° | 0 mm | 5 | |
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Important Notice
Our weather forecast for King County in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the King County forecast closer to your planned date for the most up-to-date weather information.
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King County in May - FAQ
What are the expected maximum and minimum temperatures in King County during May?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in King County during May?
Moderate rainfall is anticipated in King County during May, with a total of 76.9 mm spread over approximately 23 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in King County during May?
The average wind speed in King County during May is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in King County
Explore the daily rainfall trends and prepare for King Countys May weather 💧
Typically, King County has 23 rainy days in May with a total of 76.9 mm of rainfall.
UV exposure in King County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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Where is King County?Get accurate weather forecasts for King County, located at latitude 47.606 and longitude -122.332. Stay updated with localized weather information tailored for King County.
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