King County (Seattle)
May
Weather in King County, Washington for May 2027
Your guide to King County weather in May - trends and predictions
In general, the average temperature in King County at the beginning of May is 16.1 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 18.4 °C by the end of May.
The climate of King County in May is notably wet, with an average of 11 rainy days, and a total of 69.5 mm of precipitation.
Is May a good time to visit King County? check out the best time to travel to King County page.
✨ Is May a good time to visit King County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
20
Dry days
11
Rainy days
0
Snow days
18°/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 | Patchy rain possible | 18° /7° | 1.9 mm | 5 | |
| May 3 | Patchy rain possible | 17° /8° | 1.4 mm | 4 | |
| May 4 | Patchy rain possible | 17° /7° | 1 mm | 4 | |
| May 5 |  Moderate or heavy rain shower | 15° /7° | 6.2 mm | 4 | |
| May 6 |  Light rain | 16° /8° | 3.6 mm | 4 | |
| May 7 | Light rain | 14° /7° | 5.1 mm | 4 | |
| May 8 | Patchy rain possible | 15° /5° | 0.7 mm | 4 | |
| May 9 | Patchy rain possible | 17° /7° | 1.1 mm | 4 | |
| May 10 |  Sunny | 19° /7° | 0.2 mm | 5 | |
| May 11 |  Overcast | 19° /8° | 0.1 mm | 5 | |
| May 12 | Light rain | 20° /8° | 2.6 mm | 5 | |
| May 13 | Light rain | 17° /8° | 3 mm | 4 | |
| May 14 | Patchy rain possible | 19° /9° | 1.3 mm | 4 | |
| May 15 | Light rain | 20° /10° | 3.1 mm | 5 | |
| May 16 | Patchy rain possible | 18° /9° | 2.1 mm | 4 | |
| May 17 | Light rain | 17° /8° | 7.9 mm | 5 | |
| May 18 | Light rain | 17° /8° | 4.4 mm | 5 | |
| May 19 | Patchy rain possible | 17° /7° | 2 mm | 4 | |
| May 20 | Patchy rain possible | 18° /7° | 0.1 mm | 5 | |
| May 21 | Light rain | 16° /8° | 3.6 mm | 5 | |
| May 22 | Light rain | 19° /8° | 2.8 mm | 5 | |
| May 23 | Overcast | 17° /9° | 0.5 mm | 5 | |
| May 24 | Patchy rain possible | 19° /8° | 1.2 mm | 5 | |
| May 25 | Patchy rain possible | 18° /9° | 2.1 mm | 5 | |
| May 26 | Patchy rain possible | 18° /10° | 1.3 mm | 4 | |
| May 27 | Light rain | 19° /9° | 3.2 mm | 5 | |
| May 28 | Patchy rain possible | 19° /9° | 1.6 mm | 5 | |
| May 29 | Light rain | 17° /9° | 3.8 mm | 4 | |
| May 30 |  Partly cloudy | 19° /8° | 0.5 mm | 5 | |
| May 31 | Overcast | 20° /8° | 0 mm | 5 | |
| Next | |||||
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.
Change Month
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 18° 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 69.5 mm spread over approximately 11 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 11 rainy days in May with a total of 69.5 mm of rainfall.
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