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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 13.9 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 20.7 °C by the end of May.

  • With an average of 3 rainy days, Ontario experiences minimal rainfall in May.

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Average dry days
28
Dry days
Average rainy days
3
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/8°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
64 %
Avg humidity

Ontario in May average weather

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Temperatures trend during May in Ontario

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 Heavy rain at times
Heavy rain at times
13° /5° 1.5 mm 3
2 May Moderate rain at times
Moderate rain at times
12° /5° 2 mm 3
3 May Moderate rain at times
Moderate rain at times
13° /7° 4.6 mm 3
4 May Patchy rain possible
Patchy rain possible
13° /8° 0.8 mm 4
5 May Overcast
Overcast
13° /8° 1.2 mm 3
6 May Partly cloudy
Partly cloudy
17° /6° 0 mm 5
7 May Heavy rain at times
Heavy rain at times
16° /8° 5.3 mm 4
8 May Partly cloudy
Partly cloudy
20° /10° 0.2 mm 5
9 May Partly cloudy
Partly cloudy
14° /8° 1.4 mm 4
10 May Partly cloudy
Partly cloudy
17° /8° 0.1 mm 5
11 May Overcast
Overcast
18° /8° 0.5 mm 4
12 May Partly cloudy
Partly cloudy
19° /10° 1.2 mm 5
13 May Partly cloudy
Partly cloudy
20° /11° 7.1 mm 5
14 May Overcast
Overcast
16° /9° 13.8 mm 4
15 May Sunny
Sunny
20° /8° 0 mm 5
16 May Cloudy
Cloudy
21° /10° 0 mm 5
17 May Sunny
Sunny
17° /8° 0 mm 5
18 May Sunny
Sunny
18° /7° 0 mm 5
19 May Overcast
Overcast
22° /9° 1.4 mm 5
20 May Moderate or heavy rain shower
Moderate or heavy rain shower
21° /13° 12.9 mm 5
21 May Partly cloudy
Partly cloudy
24° /13° 1.6 mm 6
22 May Cloudy
Cloudy
22° /13° 1.9 mm 5
23 May Sunny
Sunny
21° /11° 0.2 mm 6
24 May Heavy rain at times
Heavy rain at times
20° /11° 1.3 mm 5
25 May Sunny
Sunny
17° /8° 1.7 mm 5
26 May Sunny
Sunny
21° /9° 0 mm 6
27 May Sunny
Sunny
21° /11° 2.6 mm 5
28 May Overcast
Overcast
20° /11° 1.1 mm 5
29 May Sunny
Sunny
20° /11° 0 mm 6
30 May Sunny
Sunny
21° /10° 0 mm 6
31 May Sunny
Sunny
25° /12° 0 mm 7
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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.

Ontario in May - FAQ

What are the expected maximum and minimum temperatures in Ontario during May?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 8°. 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 118.3 mm is expected in Ontario during May, occurring over more than 3 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 14 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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Location coordinates 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.

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