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Canada weather

Weather in Ontario for May 2025

Your guide to Ontario weather in May - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Ontario during May is quite rare, with fewer than 2 snowy days on average.
    According to Ontario snow forecast for May 2025, 2 snowy days are expected at the beginning of May. The first snowfall for May is expected in Saturday, 3 May.

    • Temperatures

  • The forecast for the first days of May 2025 in Ontario predicts a temperature of 13 °C , which is warmer than usual.

  • In general, the average temperature in Ontario at the beginning of May is 10.1 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 20.3 °C by the end of May.

    • Rain 🌧️

  • Ontario in May brings notable rainfall, with an average of 16 rainy days and a total precipitation of 63.1 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
15
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/9°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
67 %
Avg humidity

Ontario Weather May

Move between months or click on a day
April
June
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
13°
2
Patchy rain possible
11°
3
Patchy rain possible
8°
4
Partly cloudy
8°
5
Patchy rain possible
10°
6
Moderate rain
8°
7
Overcast
13°
8
Overcast
17°
9
Overcast
13°
10
Patchy rain possible
15°
11
Moderate rain at times
15°
12
Sunny
18°
13
Partly cloudy
19°
14
Partly cloudy
17°
15
Patchy rain possible
20°
16
Sunny
19°
17
Sunny
16°
18
Partly cloudy
17°
19
Sunny
21°
20
Cloudy
22°
21
Cloudy
23°
22
Moderate or heavy rain shower
20°
23
Sunny
19°
24
Partly cloudy
18°
25
Cloudy
19°
26
Sunny
22°
27
Partly cloudy
19°
28
Overcast
18°
29
Sunny
19°
30
Sunny
21°
31
Partly cloudy
24°
Select a date

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Access Ontario weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
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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

Click on a date for more information
April June
Date Weather Temperatures Rain Snow More
1 May Sunny
Sunny
 13° /6° 0 mm 0 cm
2 May Patchy rain possible
Patchy rain possible
 11° /9° 0.1 mm 0 cm
3 May Patchy rain possible
Patchy rain possible
 8° /3° 0.1 mm 0 cm
4 May Partly cloudy
Partly cloudy
 8° /2° 0 mm 0 cm
5 May Patchy rain possible
Patchy rain possible
 10° /2° 0.5 mm 0 cm
6 May Moderate rain
Moderate rain
 8° /6° 5.1 mm 0 cm
7 May Overcast
Overcast
 13° /7° 2.6 mm 0 cm
8 May Overcast
Overcast
 17° /7° 0.3 mm 0 cm
9 May Overcast
Overcast
 13° /7° 1.5 mm 0 cm
10 May Patchy rain possible
Patchy rain possible
 15° /7° 0.3 mm 0 cm
11 May Moderate rain at times
Moderate rain at times
 15° /7° 0.6 mm 0 cm
12 May Sunny
Sunny
 18° /8° 0.6 mm 0 cm
13 May Partly cloudy
Partly cloudy
 19° /10° 3.5 mm 0 cm
14 May Partly cloudy
Partly cloudy
 17° /9° 6.9 mm 0 cm
15 May Patchy rain possible
Patchy rain possible
 20° /9° 0.3 mm 0 cm
16 May Sunny
Sunny
 19° /10° 3.6 mm 0 cm
17 May Sunny
Sunny
 16° /8° 0 mm 0 cm
18 May Partly cloudy
Partly cloudy
 17° /8° 0 mm 0 cm
19 May Sunny
Sunny
 21° /10° 1.6 mm 0 cm
20 May Cloudy
Cloudy
 22° /13° 6.5 mm 0 cm
21 May Cloudy
Cloudy
 23° /14° 1.3 mm 0 cm
22 May Moderate or heavy rain shower
Moderate or heavy rain shower
 20° /13° 2.7 mm 0 cm
23 May Sunny
Sunny
 19° /11° 0.1 mm 0 cm
24 May Partly cloudy
Partly cloudy
 18° /10° 0.6 mm 0 cm
25 May Cloudy
Cloudy
 19° /10° 0.9 mm 0 cm
26 May Sunny
Sunny
 22° /11° 3.6 mm 0 cm
27 May Partly cloudy
Partly cloudy
 19° /11° 4.7 mm 0 cm
28 May Overcast
Overcast
 18° /10° 3 mm 0 cm
29 May Sunny
Sunny
 19° /10° 0 mm 0 cm
30 May Sunny
Sunny
 21° /11° 0.1 mm 0 cm
31 May Partly cloudy
Partly cloudy
 24° /12° 0 mm 0 cm
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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 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.

Ontario snow forecast May 2025

Track daily snowfall levels and discover Ontario’s snowy potential this May ❄️

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
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AlgomaChatham-KentDurhamHaltonHastings CountyKawartha LakesLambton CountyNipissing DistrictOttawaOxford CountyParry Sound DistrictPeelRegional Municipality of NiagaraRegional Municipality of WaterlooSimcoe CountyThunder Bay DistrictWellington CountyYork
Top locations in Ontario
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BarrieBramptonHamiltonKingstonLondonMississaugaNiagara FallsOttawaTorontoWindsor
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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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