Tri-Cities (WA)
May
Weather in Tri-Cities, Washington for May 2026
Your guide to Tri-Cities weather in May - trends and predictions
In general, the average temperature in Tri-Cities at the beginning of May is 22.9 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 26.7 °F by the end of May.
Tri-Cities experiences moderate rainfall in May, with an average of 6 rainy days and a total precipitation of 18.3 mm.
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Temperatures
Rain 🌧️
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25
Dry days
6
Rainy days
0
Snow days
26°/12°
Temperatures
17 km/h
Avg max wind
53 %
Avg humidity
Tri-Cities Weather May
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Temperatures trend during May in Tri-Cities
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May weather in Tri-Cities day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 23° /9° | 0.6 mm | 6 | |
| May 2 |  Overcast | 27° /10° | 0 mm | 7 | |
| May 3 |  Partly cloudy | 24° /11° | 5.9 mm | 6 | |
| May 4 | Overcast | 23° /8° | 0 mm | 6 | |
| May 5 |  Moderate or heavy rain shower | 19° /8° | 3 mm | 5 | |
| May 6 | Overcast | 23° /7° | 0.1 mm | 6 | |
| May 7 | Patchy rain possible | 21° /9° | 0.1 mm | 6 | |
| May 8 | Moderate or heavy rain shower | 20° /8° | 2.8 mm | 5 | |
| May 9 | Patchy rain possible | 22° /9° | 0.5 mm | 5 | |
| May 10 |  Sunny | 24° /9° | 0 mm | 6 | |
| May 11 | Sunny | 21° /11° | 1.6 mm | 6 | |
| May 12 | Sunny | 25° /10° | 0 mm | 6 | |
| May 13 | Sunny | 24° /11° | 5.5 mm | 6 | |
| May 14 |  Cloudy | 26° /12° | 0 mm | 6 | |
| May 15 |  Heavy rain at times | 25° /11° | 0.8 mm | 6 | |
| May 16 | Overcast | 25° /12° | 0.6 mm | 6 | |
| May 17 | Partly cloudy | 25° /13° | 0 mm | 7 | |
| May 18 | Sunny | 26° /12° | 0.1 mm | 7 | |
| May 19 | Sunny | 25° /11° | 0.1 mm | 6 | |
| May 20 | Patchy rain possible | 28° /13° | 0.1 mm | 7 | |
| May 21 | Patchy rain possible | 24° /11° | 0.1 mm | 6 | |
| May 22 | Sunny | 19° /10° | 2 mm | 5 | |
| May 23 | Cloudy | 23° /8° | 0 mm | 6 | |
| May 24 | Sunny | 25° /9° | 0 mm | 6 | |
| May 25 | Sunny | 26° /12° | 0 mm | 6 | |
| May 26 | Partly cloudy | 26° /11° | 0 mm | 6 | |
| May 27 | Partly cloudy | 27° /11° | 0 mm | 7 | |
| May 28 | Overcast | 29° /13° | 0 mm | 7 | |
| May 29 | Sunny | 25° /12° | 0 mm | 6 | |
| May 30 | Partly cloudy | 26° /10° | 0 mm | 6 | |
| May 31 | Sunny | 28° /11° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Tri-Cities 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 Tri-Cities forecast closer to your planned date for the most up-to-date weather information.
Change Month
Tri-Cities in May - FAQ
What are the expected maximum and minimum temperatures in Tri-Cities during May?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Tri-Cities during May?
Expect minimal rainfall in Tri-Cities during May, with a total of 18.3 mm over approximately 6 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Tri-Cities during May?
The average wind speed in Tri-Cities during May is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Tri-Cities
Explore the daily rainfall trends and prepare for Tri-Citiess May weather 💧
UV exposure in Tri-Cities during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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Where is Tri-Cities?Get accurate weather forecasts for Tri-Cities, located at latitude 46.245 and longitude -119.196. Stay updated with localized weather information tailored for Tri-Cities.
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