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.
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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
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| 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° |
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Temperatures trend during May in Sarnia
See the weather trend as well as the moving average line
May weather day by day
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| 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 | |
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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.
May rainfall patterns in Sarnia
Explore the daily rainfall trends and prepare for Sarnias May weather 💧
UV exposure in Sarnia during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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