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Weather in Thunder Bay for May 2025

Your guide to Thunder Bay weather in May - trends and predictions
  • In general, the average temperature in Thunder Bay at the beginning of May is 7.7 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 16.4 °C by the end of May.

  • Thunder Bay sees moderate rainfall in May, averaging 6 rainy days.

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Average dry days
25
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
15°/4°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Thunder Bay in May average weather

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Temperatures trend during May in Thunder Bay

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 Light freezing rain
Light freezing rain
5° /1° 7.5 mm 2
2 May Light freezing rain
Light freezing rain
5° /0° 2.5 mm 2
3 May Patchy rain possible
Patchy rain possible
10° /2° 1.4 mm 3
4 May Overcast
Overcast
8° /3° 3.8 mm 2
5 May Overcast
Overcast
9° /3° 0 mm 3
6 May Patchy rain possible
Patchy rain possible
9° /4° 1.1 mm 3
7 May Moderate or heavy rain shower
Moderate or heavy rain shower
8° /4° 3.4 mm 2
8 May Overcast
Overcast
10° /5° 0 mm 3
9 May Sunny
Sunny
13° /3° 0 mm 4
10 May Overcast
Overcast
13° /4° 1.2 mm 3
11 May Heavy rain at times
Heavy rain at times
16° /5° 0.6 mm 4
12 May Overcast
Overcast
17° /7° 0.2 mm 4
13 May Partly cloudy
Partly cloudy
13° /6° 0 mm 4
14 May Partly cloudy
Partly cloudy
14° /4° 0 mm 5
15 May Sunny
Sunny
17° /6° 0 mm 5
16 May Overcast
Overcast
12° /5° 5.7 mm 3
17 May Partly cloudy
Partly cloudy
12° /4° 0.1 mm 3
18 May Moderate or heavy rain shower
Moderate or heavy rain shower
12° /4° 3.4 mm 3
19 May Heavy rain at times
Heavy rain at times
16° /6° 4.4 mm 4
20 May Sunny
Sunny
16° /6° 4.5 mm 5
21 May Patchy rain possible
Patchy rain possible
13° /6° 9.6 mm 3
22 May Partly cloudy
Partly cloudy
11° /5° 4.8 mm 3
23 May Moderate or heavy rain shower
Moderate or heavy rain shower
15° /5° 5.9 mm 4
24 May Partly cloudy
Partly cloudy
8° /2° 9 mm 3
25 May Sunny
Sunny
14° /3° 4.8 mm 4
26 May Sunny
Sunny
15° /5° 2.2 mm 5
27 May Sunny
Sunny
20° /7° 0 mm 5
28 May Partly cloudy
Partly cloudy
16° /8° 0.4 mm 5
29 May Overcast
Overcast
16° /6° 0 mm 4
30 May Sunny
Sunny
17° /6° 0 mm 5
31 May Patchy rain possible
Patchy rain possible
17° /8° 3 mm 4
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Important Notice
Our weather forecast for Thunder Bay 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 Thunder Bay forecast closer to your planned date for the most up-to-date weather information.

Thunder Bay in May - FAQ

What are the expected maximum and minimum temperatures in Thunder Bay during May?
Prepare for cooler days with highs just around 15° and colder nights, dipping below 4°.
How much rainfall should be expected in Thunder Bay during May?
Significant rainfall exceeding 138.1 mm is expected in Thunder Bay during May, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Thunder Bay during May?
The average wind speed in Thunder Bay during May is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Thunder Bay

Explore the daily rainfall trends and prepare for Thunder Bays May weather 💧

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Location coordinates Where is Thunder Bay?

Get accurate weather forecasts for Thunder Bay, located at latitude 48.382 and longitude -89.25. Stay updated with localized weather information tailored for Thunder Bay.

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