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Weather in Sarnia for May 2025

Your guide to Sarnia weather in May - trends and predictions

    Temperatures

  • Until now, May 2025 in Sarnia has been nearly identical to the historical average, with a temperature of 14.9 °C (showing only a slight deviation of -0.5 °C).

  • The forecast for the upcoming days in Sarnia predicts a temperature of 18.6 °C, which is slightly above the historical average.

  • In general, the average temperature in Sarnia at the beginning of May is 13.3 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 20.7 °C by the end of May.

    • Rain 🌧️

  • Sarnia in May brings notable rainfall, with an average of 16 rainy days and a total precipitation of 85.5 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
20 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Sarnia Weather May

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

Temperatures trend during May in Sarnia

See the weather trend as well as the moving average line

May weather in Sarnia day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
1 May Patchy rain possible
Patchy rain possible
 15° /5° 7.1 mm 3
2 May Moderate rain at times
Moderate rain at times
 10° /5° 3.2 mm 3
3 May Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /5° 9.7 mm 3
4 May Patchy rain possible
Patchy rain possible
 12° /5° 9.8 mm 3
5 May Overcast
Overcast
 14° /5° 6.4 mm 3
6 May Partly cloudy
Partly cloudy
 14° /6° 5 mm 4
7 May Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /6° 4.1 mm 4
8 May Overcast
Overcast
 14° /7° 0 mm 3
9 May Overcast
Overcast
 11° /5° 1.5 mm 3
10 May Overcast
Overcast
 16° /6° 0.5 mm 4
11 May Partly cloudy
Partly cloudy
 15° /6° 3.2 mm 4
12 May Overcast
Overcast
 19° /8° 0.2 mm 5
13 May Light rain shower
Light rain shower
 20° /12° 7.3 mm 5
14 May Partly cloudy
Partly cloudy
 16° /8° 5.3 mm 4
15 May Sunny
Sunny
 19° /8° 0 mm 5
16 May Overcast
Overcast
 22° /11° 8.3 mm 5
17 May Sunny
Sunny
 16° /9° 3.9 mm 4
18 May Sunny
Sunny
 17° /7° 0 mm 4
19 May Moderate or heavy rain shower
Moderate or heavy rain shower
 18° /8° 5 mm 4
20 May Patchy rain possible
Patchy rain possible
 10° /0° 4.4 mm 2
21 May Patchy rain possible
Patchy rain possible
 14° /7° 0.8 mm 1.4
22 May Cloudy
Cloudy
 13° /7° 0 mm 0
23 May Patchy rain possible
Patchy rain possible
 13° /5° 0.1 mm 2
24 May Patchy rain possible
Patchy rain possible
 17° /7° 0.1 mm 3
25 May Patchy rain possible
Patchy rain possible
 18° /9° 0.1 mm 3
26 May Patchy rain possible
Patchy rain possible
 15° /9° 0.5 mm 3
27 May Partly cloudy
Partly cloudy
 18° /8° 0 mm 4
28 May Patchy rain possible
Patchy rain possible
 21° /9° 3.1 mm 4
29 May Sunny
Sunny
 23° /12° 0 mm 5
30 May Sunny
Sunny
 24° /13° 0 mm 5
31 May Patchy rain possible
Patchy rain possible
 26° /16° 0.3 mm 5
Next
Important Notice
Our weather forecast for Sarnia 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 Sarnia forecast closer to your planned date for the most up-to-date weather information.
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Sarnia in May - FAQ

What are the expected maximum and minimum temperatures in Sarnia 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 Sarnia during May?
Moderate rainfall is anticipated in Sarnia during May, with a total of 85.5 mm spread over approximately 16 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Sarnia during May?
The average wind speed in Sarnia during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Sarnia

Explore the daily rainfall trends and prepare for Sarnias May weather 💧

UV exposure in Sarnia during May

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

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Location coordinates Where is Sarnia?

Get accurate weather forecasts for Sarnia, located at latitude 42.979 and longitude -82.404. Stay updated with localized weather information tailored for Sarnia.

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