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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 22.1 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 23.3 °F by the end of May.

  • With an average of 3 rainy days, Ontario experiences minimal rainfall in May, ensuring that most days remain pleasantly dry.

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Average dry days
28
Dry days
Average rainy days
3
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/11°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
55 %
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
May 1 Sunny
Sunny
24° /10° 0 mm 6
May 2 Sunny
Sunny
25° /13° 0 mm 7
May 3 Sunny
Sunny
24° /12° 0 mm 6
May 4 Partly cloudy
Partly cloudy
20° /10° 0.2 mm 6
May 5 Patchy rain possible
Patchy rain possible
17° /10° 2.3 mm 4
May 6 Sunny
Sunny
22° /9° 0 mm 6
May 7 Sunny
Sunny
23° /11° 0 mm 6
May 8 Sunny
Sunny
24° /9° 0 mm 6
May 9 Sunny
Sunny
26° /10° 0 mm 7
May 10 Sunny
Sunny
26° /12° 0 mm 7
May 11 Sunny
Sunny
27° /11° 0 mm 7
May 12 Sunny
Sunny
27° /13° 0 mm 7
May 13 Overcast
Overcast
25° /15° 0 mm 6
May 14 Sunny
Sunny
23° /11° 0 mm 6
May 15 Sunny
Sunny
23° /9° 0 mm 6
May 16 Sunny
Sunny
24° /9° 0 mm 6
May 17 Partly cloudy
Partly cloudy
24° /11° 0 mm 6
May 18 Sunny
Sunny
23° /10° 0 mm 6
May 19 Sunny
Sunny
23° /8° 0 mm 6
May 20 Overcast
Overcast
29° /15° 0 mm 6
May 21 Cloudy
Cloudy
29° /14° 0 mm 6
May 22 Sunny
Sunny
26° /12° 0 mm 7
May 23 Sunny
Sunny
23° /11° 0 mm 7
May 24 Partly cloudy
Partly cloudy
21° /10° 0.1 mm 5
May 25 Sunny
Sunny
21° /8° 0.1 mm 6
May 26 Partly cloudy
Partly cloudy
23° /10° 0.1 mm 6
May 27 Sunny
Sunny
25° /9° 0 mm 7
May 28 Partly cloudy
Partly cloudy
24° /11° 0 mm 7
May 29 Partly cloudy
Partly cloudy
24° /11° 0.1 mm 7
May 30 Patchy rain possible
Patchy rain possible
24° /12° 0.3 mm 6
May 31 Patchy rain possible
Patchy rain possible
22° /12° 0.2 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.

Ontario in May - FAQ

What are the expected maximum and minimum temperatures in Ontario during May?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Ontario during May?
Rainfall in Ontario during May is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 3 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Ontario during May?
The average wind speed in Ontario during May is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

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Location coordinates Where is Ontario?

Get accurate weather forecasts for Ontario, located at latitude 34.063 and longitude -117.651. Stay updated with localized weather information tailored for Ontario.

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