Ontario (Toronto)
May
Weather in Ontario for May 2025
Your guide to Ontario weather in May - trends and predictions
In general, the average temperature in Ontario at the beginning of May is 12.4 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 20.3 °C by the end of May.
Ontario in May brings notable rainfall, with an average of 16 rainy days and a total precipitation of 63.1 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
15
Dry days
16
Rainy days
0
Snow days
17°/9°
Temperatures
16 km/h
Avg max wind
67 %
Avg humidity
Ontario Weather May
Move between months or click on a day
| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  11° | 2  12° | 3  11° | ||||
| 4 13° | 5  12° | 6  15° | 7 13° | 8 17° | 9 13° | 10 15° |
| 11 15° | 12  18° | 13 19° | 14 17° | 15 20° | 16 19° | 17 16° |
| 18 17° | 19 21° | 20  22° | 21 23° | 22 20° | 23 19° | 24 18° |
| 25 19° | 26 22° | 27 19° | 28 18° | 29 19° | 30 21° | 31 24° |
You can click on date
Access Ontario weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during May in Ontario
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 | 11° /4° | 2.3 mm | 3 | |
| 2 May | Heavy rain at times | 12° /6° | 4.2 mm | 3 | |
| 3 May | Moderate rain at times | 11° /6° | 9 mm | 3 | |
| 4 May | Patchy rain possible | 13° /7° | 1.4 mm | 3 | |
| 5 May | Overcast | 12° /7° | 0.6 mm | 3 | |
| 6 May | Partly cloudy | 15° /6° | 0.2 mm | 4 | |
| 7 May | Overcast | 13° /7° | 2.6 mm | 3 | |
| 8 May | Overcast | 17° /7° | 0.3 mm | 4 | |
| 9 May | Overcast | 13° /7° | 1.5 mm | 3 | |
| 10 May | Patchy rain possible | 15° /7° | 0.3 mm | 4 | |
| 11 May | Moderate rain at times | 15° /7° | 0.6 mm | 4 | |
| 12 May | Sunny | 18° /8° | 0.6 mm | 5 | |
| 13 May | Partly cloudy | 19° /10° | 3.5 mm | 5 | |
| 14 May | Partly cloudy | 17° /9° | 6.9 mm | 5 | |
| 15 May | Patchy rain possible | 20° /9° | 0.3 mm | 5 | |
| 16 May | Sunny | 19° /10° | 3.6 mm | 5 | |
| 17 May | Sunny | 16° /8° | 0 mm | 4 | |
| 18 May | Partly cloudy | 17° /8° | 0 mm | 5 | |
| 19 May | Sunny | 21° /10° | 1.6 mm | 5 | |
| 20 May | Cloudy | 22° /13° | 6.5 mm | 5 | |
| 21 May | Cloudy | 23° /14° | 1.3 mm | 6 | |
| 22 May | Moderate or heavy rain shower | 20° /13° | 2.7 mm | 5 | |
| 23 May | Sunny | 19° /11° | 0.1 mm | 5 | |
| 24 May | Partly cloudy | 18° /10° | 0.6 mm | 5 | |
| 25 May | Cloudy | 19° /10° | 0.9 mm | 5 | |
| 26 May | Sunny | 22° /11° | 3.6 mm | 6 | |
| 27 May | Partly cloudy | 19° /11° | 4.7 mm | 5 | |
| 28 May | Overcast | 18° /10° | 3 mm | 4 | |
| 29 May | Sunny | 19° /10° | 0 mm | 5 | |
| 30 May | Sunny | 21° /11° | 0.1 mm | 6 | |
| 31 May | Partly cloudy | 24° /12° | 0 mm | 6 | |
| Next | |||||
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.
Ontario in May - FAQ
What are the expected maximum and minimum temperatures in Ontario during May?
Enjoy moderate daytime temperatures of up to 17° 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?
Moderate rainfall is anticipated in Ontario during May, with a total of 63.1 mm spread over approximately 16 days. Considering plans for rainy days is advisable.
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 ☀️
Provinces in Ontario
Select a province for an accurate weather forecast
Top locations in Ontario
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is Ontario?Get accurate weather forecasts for Ontario, located at latitude 43.706 and longitude -79.399. Stay updated with localized weather information tailored for Ontario.
Found a mistake?
We appreciate your attention to details. Tell us here.