Ontario (Toronto)
May
Weather in Ontario for May 2026
Your guide to Ontario weather in May - trends and predictions
In general, the average temperature in Ontario at the beginning of May is 12.9 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 19.6 °C by the end of May.
Ontario experiences heavy rainfall in May, with over 20 rainy days and an average total precipitation 120 mm.
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Temperatures
Rain 🌧️
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8
Dry days
23
Rainy days
0
Snow days
16°/9°
Temperatures
16 km/h
Avg max wind
70 %
Avg humidity
Ontario Weather May
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What’s the Weather Like in Ontario This May?
Discover the average temperatures and weather trends across Ontario’s cities this May.
Temperatures trend during May in Ontario
See the weather trend as well as the moving average line
May weather in Ontario day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 May |  Patchy rain possible | 11° /4° | 9.6 mm | 3 | |
| 2 May |  Moderate rain at times | 12° /6° | 4.2 mm | 3 | |
| 3 May | Moderate rain at times | 12° /6° | 7.2 mm | 3 | |
| 4 May | Patchy rain possible | 13° /6° | 1.1 mm | 3 | |
| 5 May |  Overcast | 13° /7° | 0.5 mm | 3 | |
| 6 May |  Partly cloudy | 15° /6° | 5 mm | 4 | |
| 7 May | Overcast | 14° /7° | 4.8 mm | 3 | |
| 8 May | Overcast | 16° /6° | 0.2 mm | 4 | |
| 9 May | Overcast | 13° /6° | 1.2 mm | 4 | |
| 10 May | Patchy rain possible | 16° /6° | 0.3 mm | 4 | |
| 11 May | Moderate rain at times | 15° /6° | 0.5 mm | 4 | |
| 12 May |  Sunny | 19° /8° | 0.5 mm | 5 | |
| 13 May | Partly cloudy | 18° /10° | 5.3 mm | 5 | |
| 14 May | Partly cloudy | 16° /9° | 5.9 mm | 4 | |
| 15 May | Patchy rain possible | 19° /9° | 0.3 mm | 5 | |
| 16 May | Sunny | 20° /10° | 6.5 mm | 5 | |
| 17 May | Sunny | 17° /8° | 1.2 mm | 4 | |
| 18 May | Partly cloudy | 17° /8° | 0 mm | 5 | |
| 19 May | Sunny | 20° /9° | 1.3 mm | 5 | |
| 20 May |  Cloudy | 20° /11° | 5.2 mm | 5 | |
| 21 May |  Heavy rain at times | 20° /13° | 8.8 mm | 5 | |
| 22 May | Moderate or heavy rain shower | 17° /11° | 18.5 mm | 4 | |
| 23 May | Sunny | 17° /10° | 4.2 mm | 4 | |
| 24 May | Partly cloudy | 17° /9° | 0.5 mm | 4 | |
| 25 May | Cloudy | 19° /9° | 2.8 mm | 5 | |
| 26 May | Sunny | 22° /10° | 2.9 mm | 5 | |
| 27 May | Partly cloudy | 18° /10° | 3.7 mm | 4 | |
| 28 May | Overcast | 18° /10° | 3.4 mm | 4 | |
| 29 May | Sunny | 18° /9° | 9.2 mm | 5 | |
| 30 May | Sunny | 20° /11° | 1.7 mm | 5 | |
| 31 May | Partly cloudy | 22° /11° | 3.5 mm | 6 | |
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Important Notice
Our weather forecast for Ontario 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 Ontario forecast closer to your planned date for the most up-to-date weather information.
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Ontario in May - FAQ
What are the expected maximum and minimum temperatures in Ontario during May?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Ontario during May?
Significant rainfall exceeding 120 mm is expected in Ontario during May, occurring over more than 23 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ontario during May?
The average wind speed in Ontario during May is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Ontario
Explore the daily rainfall trends and prepare for Ontarios May weather 💧
UV exposure in Ontario during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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