Sarnia
May
Weather in Sarnia for May 2025
Your guide to Sarnia weather in May - trends and predictions
In general, the average temperature in Sarnia at the beginning of May is 13.7 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 19.1 °C by the end of May.
With an average of 4 rainy days, Sarnia experiences minimal rainfall in May, ensuring that most days remain pleasantly dry.
- New! Chat with our AI weatherman - it’s amazing and free.
27
Dry days
4
Rainy days
0
Snow days
20°/7°
Temperatures
19 km/h
Avg max wind
75 %
Avg humidity
Sarnia in May average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  14° | 2  8° | 3 14° | 4 13° | |||
| 5  15° | 6  14° | 7 18° | 8 18° | 9 11° | 10 15° | 11 17° |
| 12 18° | 13  19° | 14 13° | 15  17° | 16 20° | 17 16° | 18 20° |
| 19 22° | 20 19° | 21 20° | 22 22° | 23 21° | 24 18° | 25 16° |
| 26 19° | 27 20° | 28 18° | 29 17° | 30 20° | 31 24° |
You can click on date
Access Sarnia weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during May in Sarnia
See the weather trend as well as the moving average line
May weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 May | Patchy rain possible | 14° /5° | 1.6 mm | 3 | |
| 2 May | Moderate rain at times | 8° /5° | 4.8 mm | 3 | |
| 3 May | Moderate or heavy rain shower | 14° /6° | 14.5 mm | 3 | |
| 4 May | Patchy rain possible | 13° /7° | 0.2 mm | 4 | |
| 5 May | Overcast | 15° /5° | 0.4 mm | 4 | |
| 6 May | Partly cloudy | 14° /6° | 0 mm | 5 | |
| 7 May | Moderate or heavy rain shower | 18° /8° | 6.1 mm | 4 | |
| 8 May | Overcast | 18° /9° | 0 mm | 4 | |
| 9 May | Overcast | 11° /6° | 2.2 mm | 3 | |
| 10 May | Overcast | 15° /7° | 0.8 mm | 4 | |
| 11 May | Partly cloudy | 17° /9° | 4.9 mm | 5 | |
| 12 May | Overcast | 18° /9° | 0.4 mm | 4 | |
| 13 May | Cloudy | 19° /11° | 4.3 mm | 5 | |
| 14 May | Partly cloudy | 13° /6° | 7.9 mm | 4 | |
| 15 May | Sunny | 17° /6° | 0 mm | 5 | |
| 16 May | Overcast | 20° /8° | 0.1 mm | 5 | |
| 17 May | Sunny | 16° /8° | 2.8 mm | 5 | |
| 18 May | Sunny | 20° /8° | 0 mm | 5 | |
| 19 May | Moderate or heavy rain shower | 22° /11° | 7.6 mm | 5 | |
| 20 May | Patchy rain possible | 19° /10° | 5.7 mm | 4 | |
| 21 May | Sunny | 20° /13° | 8 mm | 5 | |
| 22 May | Cloudy | 22° /13° | 1.5 mm | 5 | |
| 23 May | Sunny | 21° /11° | 0.1 mm | 6 | |
| 24 May | Overcast | 18° /9° | 0 mm | 5 | |
| 25 May | Sunny | 16° /8° | 5.4 mm | 5 | |
| 26 May | Sunny | 19° /9° | 0 mm | 6 | |
| 27 May | Sunny | 20° /11° | 4.3 mm | 6 | |
| 28 May | Sunny | 18° /10° | 0.4 mm | 5 | |
| 29 May | Sunny | 17° /9° | 1.7 mm | 5 | |
| 30 May | Sunny | 20° /9° | 0 mm | 6 | |
| 31 May | Sunny | 24° /11° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Sarnia 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 Sarnia forecast closer to your planned date for the most up-to-date weather information.
Sarnia in May - FAQ
What are the expected maximum and minimum temperatures in Sarnia during May?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Sarnia during May?
Significant rainfall exceeding 147.3 mm is expected in Sarnia during May, occurring over more than 4 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Sarnia during May?
The average wind speed in Sarnia during May is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
Quick links
You are here
Where is Sarnia?Get accurate weather forecasts for Sarnia, located at latitude 42.979 and longitude -82.404. Stay updated with localized weather information tailored for Sarnia.
Found a mistake?
We appreciate your attention to details. Tell us here.