Sonoma County (Santa Rosa)
May
Weather in Sonoma County, California for May 2026
Your guide to Sonoma County weather in May - trends and predictions
In general, the average temperature in Sonoma County at the beginning of May is 19 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 22.7 °F by the end of May.
Precipitation in Sonoma County during May is a rare event, with an average of fewer than 2 rainy days.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
30
Dry days
1
Rainy days
0
Snow days
22°/8°
Temperatures
15 km/h
Avg max wind
67 %
Avg humidity
Sonoma County Weather May
Move between months or click on a day
Temperatures trend during May in Sonoma County
See the weather trend as well as the moving average line
May weather in Sonoma County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Cloudy | 19° /7° | 0 mm | 5 | |
| May 2 |  Sunny | 20° /7° | 0 mm | 5 | |
| May 3 | Sunny | 19° /8° | 0 mm | 5 | |
| May 4 |  Moderate rain | 18° /5° | 9.4 mm | 5 | |
| May 5 |  Partly cloudy | 20° /7° | 0 mm | 6 | |
| May 6 | Sunny | 19° /5° | 0 mm | 6 | |
| May 7 |  Mist | 18° /5° | 0 mm | 4 | |
| May 8 | Sunny | 22° /7° | 0 mm | 6 | |
| May 9 | Sunny | 24° /9° | 0 mm | 6 | |
| May 10 | Sunny | 25° /9° | 0 mm | 6 | |
| May 11 | Sunny | 20° /8° | 0 mm | 6 | |
| May 12 | Sunny | 19° /9° | 9.1 mm | 5 | |
| May 13 | Sunny | 20° /6° | 0 mm | 5 | |
| May 14 | Sunny | 22° /6° | 0 mm | 6 | |
| May 15 | Mist | 21° /7° | 0 mm | 5 | |
| May 16 | Fog | 23° /10° | 0 mm | 6 | |
| May 17 | Partly cloudy | 21° /9° | 0 mm | 5 | |
| May 18 | Mist | 21° /7° | 0 mm | 5 | |
| May 19 | Sunny | 25° /8° | 0 mm | 7 | |
| May 20 | Sunny | 25° /9° | 0 mm | 7 | |
| May 21 |  Overcast | 25° /8° | 0 mm | 6 | |
| May 22 | Sunny | 24° /8° | 0 mm | 6 | |
| May 23 | Cloudy | 22° /7° | 0 mm | 5 | |
| May 24 | Partly cloudy | 21° /7° | 0 mm | 6 | |
| May 25 | Partly cloudy | 19° /8° | 0 mm | 5 | |
| May 26 | Overcast | 21° /8° | 0 mm | 5 | |
| May 27 | Cloudy | 22° /7° | 0 mm | 5 | |
| May 28 |  Patchy rain possible | 22° /9° | 0 mm | 5 | |
| May 29 | Partly cloudy | 24° /8° | 0 mm | 6 | |
| May 30 | Partly cloudy | 25° /9° | 0 mm | 6 | |
| May 31 | Cloudy | 26° /9° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Sonoma 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 Sonoma County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Sonoma County in May - FAQ
What are the expected maximum and minimum temperatures in Sonoma County during May?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Sonoma County during May?
Expect minimal rainfall in Sonoma County during May, with a total of 19 mm over approximately 1 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Sonoma County during May?
The average wind speed in Sonoma County during May is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Sonoma County
Explore the daily rainfall trends and prepare for Sonoma Countys May weather 💧
UV exposure in Sonoma County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
Top locations in Sonoma County
Select a location for an accurate weather forecast
More Locations Quick links
More Sonoma County weather pages
You are here
Where is Sonoma County?Get accurate weather forecasts for Sonoma County, located at latitude 38.44 and longitude -122.714. Stay updated with localized weather information tailored for Sonoma County.
Found a mistake?
We appreciate your attention to details. Tell us here.