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Weather in St. Catharines for May 2025

Your guide to St. Catharines weather in May - trends and predictions

    Snow Forecast ❄️

  • Snowfall in St. Catharines during May is quite rare, with fewer than 2 snowy days on average.
    According to St. Catharines snow forecast for May 2025, 1 snowy day is expected at the beginning of May at Friday, 2 May.

    • Temperatures

  • The forecast for the first days of May 2025 in St. Catharines predicts a temperature of 16.8 °C, which is slightly above the historical average.

  • In general, the average temperature in St. Catharines at the beginning of May is 15 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 19.3 °C by the end of May.

    • Rain 🌧️

  • The climate of St. Catharines in May is notably wet, with an average of 15 rainy days, and a total of 71.6 mm of precipitation.

    • More

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

Average dry days
16
Dry days
Average rainy days
15
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/9°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
77 %
Avg humidity

St. Catharines Weather May

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

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 Overcast
Overcast
 14° /6° 0 mm 0 cm
2 May Patchy rain possible
Patchy rain possible
 16° /4° 0.2 mm 0 cm
3 May Sunny
Sunny
 9° /1° 0 mm 0 cm
4 May Sunny
Sunny
 13° /2° 0 mm 0 cm
5 May Sunny
Sunny
 17° /6° 0 mm 0 cm
6 May Partly cloudy
Partly cloudy
 18° /10° 0 mm 0 cm
7 May Partly cloudy
Partly cloudy
 18° /11° 0.1 mm 0 cm
8 May Overcast
Overcast
 18° /9° 1.1 mm 0 cm
9 May Moderate or heavy rain shower
Moderate or heavy rain shower
 12° /8° 4.2 mm 0 cm
10 May Partly cloudy
Partly cloudy
 14° /7° 0.1 mm 0 cm
11 May Overcast
Overcast
 15° /8° 2.9 mm 0 cm
12 May Sunny
Sunny
 17° /9° 0.2 mm 0 cm
13 May Partly cloudy
Partly cloudy
 17° /10° 5.9 mm 0 cm
14 May Cloudy
Cloudy
 13° /9° 13.9 mm 0 cm
15 May Sunny
Sunny
 17° /8° 0 mm 0 cm
16 May Overcast
Overcast
 17° /10° 0 mm 0 cm
17 May Sunny
Sunny
 14° /9° 0.1 mm 0 cm
18 May Sunny
Sunny
 16° /8° 0.2 mm 0 cm
19 May Overcast
Overcast
 18° /10° 1.1 mm 0 cm
20 May Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /11° 16.3 mm 0 cm
21 May Sunny
Sunny
 21° /12° 0.9 mm 0 cm
22 May Partly cloudy
Partly cloudy
 20° /12° 2 mm 0 cm
23 May Cloudy
Cloudy
 20° /12° 0.2 mm 0 cm
24 May Moderate rain at times
Moderate rain at times
 18° /11° 0.6 mm 0 cm
25 May Sunny
Sunny
 17° /9° 4.4 mm 0 cm
26 May Sunny
Sunny
 18° /10° 0 mm 0 cm
27 May Sunny
Sunny
 20° /12° 2 mm 0 cm
28 May Sunny
Sunny
 20° /11° 1.5 mm 0 cm
29 May Sunny
Sunny
 19° /11° 0 mm 0 cm
30 May Sunny
Sunny
 19° /11° 0 mm 0 cm
31 May Sunny
Sunny
 22° /12° 0 mm 0 cm
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Important Notice
Our weather forecast for St. Catharines 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 St. Catharines forecast closer to your planned date for the most up-to-date weather information.

St. Catharines in May - FAQ

What are the expected maximum and minimum temperatures in St. Catharines 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 St. Catharines during May?
Moderate rainfall is anticipated in St. Catharines during May, with a total of 71.6 mm spread over approximately 15 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in St. Catharines during May?
The average wind speed in St. Catharines during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

St. Catharines snow forecast May 2025

Track daily snowfall levels and discover St. Catharines’s snowy potential this May ❄️

May rainfall patterns in St. Catharines

Explore the daily rainfall trends and prepare for St. Cathariness May weather 💧

UV exposure in St. Catharines during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️

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Location coordinates Where is St. Catharines?

Get accurate weather forecasts for St. Catharines, located at latitude 43.171 and longitude -79.243. Stay updated with localized weather information tailored for St. Catharines.

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