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Weather in Thunder Bay for May 2026

Your guide to Thunder Bay weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Thunder Bay at the beginning of May is 8.4 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 17.4 °C by the end of May.

    • Rain 🌧️

  • Thunder Bay in May brings notable rainfall, with an average of 18 rainy days and a total precipitation of 79.4 mm.

    • More

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Average dry days
13
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
13°/5°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Thunder Bay Weather May

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

Temperatures trend during May in Thunder Bay

See the weather trend as well as the moving average line

May weather in Thunder Bay day by day

Click on a date for more information
April June
Date Weather Temperatures Rain Snow More
1 May Light freezing rain
Light freezing rain
 5° /1° 13.4 mm 0 cm
2 May Light freezing rain
Light freezing rain
 6° /0° 9.9 mm 4.5 cm
3 May Patchy rain possible
Patchy rain possible
 12° /1° 0.9 mm 0 cm
4 May Overcast
Overcast
 7° /2° 2.5 mm 0 cm
5 May Overcast
Overcast
 9° /2° 0 mm 0 cm
6 May Patchy rain possible
Patchy rain possible
 12° /3° 0.7 mm 0 cm
7 May Moderate or heavy rain shower
Moderate or heavy rain shower
 8° /4° 2.3 mm 0 cm
8 May Overcast
Overcast
 11° /4° 0 mm 0 cm
9 May Sunny
Sunny
 15° /2° 0 mm 0 cm
10 May Overcast
Overcast
 14° /4° 0.8 mm 0 cm
11 May Heavy rain at times
Heavy rain at times
 17° /5° 0.4 mm 0 cm
12 May Overcast
Overcast
 20° /6° 0.2 mm 0 cm
13 May Partly cloudy
Partly cloudy
 16° /6° 0 mm 0 cm
14 May Partly cloudy
Partly cloudy
 13° /5° 0 mm 0 cm
15 May Sunny
Sunny
 14° /6° 24.9 mm 0 cm
16 May Overcast
Overcast
 11° /5° 15.9 mm 0 cm
17 May Partly cloudy
Partly cloudy
 11° /3° 0.1 mm 0 cm
18 May Moderate or heavy rain shower
Moderate or heavy rain shower
 10° /2° 6.1 mm 2.8 cm
19 May Heavy rain at times
Heavy rain at times
 13° /5° 2.9 mm 0 cm
20 May Sunny
Sunny
 15° /5° 3 mm 0 cm
21 May Patchy rain possible
Patchy rain possible
 14° /5° 6.4 mm 0 cm
22 May Partly cloudy
Partly cloudy
 11° /5° 3.2 mm 0 cm
23 May Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /5° 3.9 mm 0 cm
24 May Partly cloudy
Partly cloudy
 10° /4° 6 mm 0 cm
25 May Sunny
Sunny
 15° /4° 3.2 mm 0 cm
26 May Sunny
Sunny
 16° /6° 1.5 mm 0 cm
27 May Sunny
Sunny
 19° /7° 0 mm 0 cm
28 May Partly cloudy
Partly cloudy
 17° /7° 0.2 mm 0 cm
29 May Overcast
Overcast
 19° /8° 0 mm 0 cm
30 May Sunny
Sunny
 19° /9° 0 mm 0 cm
31 May Patchy rain possible
Patchy rain possible
 17° /8° 2 mm 0 cm
Next
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.
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Thunder Bay in May - FAQ

What are the expected maximum and minimum temperatures in Thunder Bay during May?
During May, expect a variety of temperatures with highs around 13° and lows near 5°, suitable for diverse activities and preferences.
How much rainfall should be expected in Thunder Bay during May?
Moderate rainfall is anticipated in Thunder Bay during May, with a total of 79.4 mm spread over approximately 18 days. Considering plans for rainy days is advisable.
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.

Thunder Bay snow forecast May 2026

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

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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