Click on a day for an hourly weather forecast
The weather in Thunder Bay in March is very cold with temperatures between -8°C and -2°C, warm clothes are a must.
You can expect rain for roughly half of the month of March in Thunder Bay. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Let it snow! You can expect Thunder Bay to be covered in white during the month of March. Be sure to bundle up when you venture outside, or take the opportunity to enjoy hot cocoa by the fire for warmth this month.
Our weather forecast can give you a great sense of what weather to expect in Thunder Bay in March 2025.
If you’re planning to visit Thunder Bay in the near future, we highly recommend that you review the 14 day weather forecast for Thunder Bay before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -10° / -16° | 5 | 4 | 23 | 51 mm | Awful | Thunder Bay in January |
| February | -9° / -16° | 4 | 5 | 20 | 51 mm | Awful | Thunder Bay in February |
| March | -2° / -8° | 9 | 5 | 19 | 75 mm | Awful | Thunder Bay in March |
| April | 4° / -2° | 7 | 12 | 12 | 100 mm | Awful | Thunder Bay in April |
| May | 12° / 4° | 7 | 23 | 2 | 96 mm | Awful | Thunder Bay in May |
| June | 17° / 9° | 6 | 24 | 0 | 98 mm | Good | Thunder Bay in June |
| July | 21° / 13° | 5 | 26 | 0 | 90 mm | Good | Thunder Bay in July |
| August | 21° / 13° | 4 | 27 | 0 | 87 mm | Good | Thunder Bay in August |
| September | 16° / 9° | 5 | 25 | 0 | 84 mm | Good | Thunder Bay in September |
| October | 8° / 3° | 6 | 20 | 5 | 74 mm | Bad | Thunder Bay in October |
| November | 1° / -4° | 6 | 10 | 14 | 78 mm | Awful | Thunder Bay in November |
| December | -6° / -11° | 5 | 6 | 21 | 69 mm | Awful | Thunder Bay in December |