Thunder Bay
May
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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25
Dry days
6
Rainy days
0
Snow days
15°/4°
Temperatures
18 km/h
Avg max wind
75 %
Avg humidity
Thunder Bay in May average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  5° | 2 5° | 3  10° | 4  8° | |||
| 5 9° | 6 9° | 7  8° | 8 10° | 9  13° | 10 13° | 11  16° |
| 12 17° | 13  13° | 14 14° | 15 17° | 16 12° | 17 12° | 18 12° |
| 19 16° | 20 16° | 21 13° | 22 11° | 23 15° | 24 8° | 25 14° |
| 26 15° | 27 20° | 28 16° | 29 16° | 30 17° | 31 17° |
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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 | 5° /1° | 7.5 mm | 2 | |
| 2 May | Light freezing rain | 5° /0° | 2.5 mm | 2 | |
| 3 May | Patchy rain possible | 10° /2° | 1.4 mm | 3 | |
| 4 May | Overcast | 8° /3° | 3.8 mm | 2 | |
| 5 May | Overcast | 9° /3° | 0 mm | 3 | |
| 6 May | Patchy rain possible | 9° /4° | 1.1 mm | 3 | |
| 7 May | Moderate or heavy rain shower | 8° /4° | 3.4 mm | 2 | |
| 8 May | Overcast | 10° /5° | 0 mm | 3 | |
| 9 May | Sunny | 13° /3° | 0 mm | 4 | |
| 10 May | Overcast | 13° /4° | 1.2 mm | 3 | |
| 11 May | Heavy rain at times | 16° /5° | 0.6 mm | 4 | |
| 12 May | Overcast | 17° /7° | 0.2 mm | 4 | |
| 13 May | Partly cloudy | 13° /6° | 0 mm | 4 | |
| 14 May | Partly cloudy | 14° /4° | 0 mm | 5 | |
| 15 May | Sunny | 17° /6° | 0 mm | 5 | |
| 16 May | Overcast | 12° /5° | 5.7 mm | 3 | |
| 17 May | Partly cloudy | 12° /4° | 0.1 mm | 3 | |
| 18 May | Moderate or heavy rain shower | 12° /4° | 3.4 mm | 3 | |
| 19 May | Heavy rain at times | 16° /6° | 4.4 mm | 4 | |
| 20 May | Sunny | 16° /6° | 4.5 mm | 5 | |
| 21 May | Patchy rain possible | 13° /6° | 9.6 mm | 3 | |
| 22 May | Partly cloudy | 11° /5° | 4.8 mm | 3 | |
| 23 May | Moderate or heavy rain shower | 15° /5° | 5.9 mm | 4 | |
| 24 May | Partly cloudy | 8° /2° | 9 mm | 3 | |
| 25 May | Sunny | 14° /3° | 4.8 mm | 4 | |
| 26 May | Sunny | 15° /5° | 2.2 mm | 5 | |
| 27 May | Sunny | 20° /7° | 0 mm | 5 | |
| 28 May | Partly cloudy | 16° /8° | 0.4 mm | 5 | |
| 29 May | Overcast | 16° /6° | 0 mm | 4 | |
| 30 May | Sunny | 17° /6° | 0 mm | 5 | |
| 31 May | 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.
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