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The weather in Sarnia in March is very cold with temperatures between -3°C and 5°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Sarnia during the month of March. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
You can expect a few days of snow in Sarnia during March. It’s important to get out your snow boots and warm mittens to stay warm while you explore Sarnia.
Our weather forecast can give you a great sense of what weather to expect in Sarnia in March 2025.
If you’re planning to visit Sarnia in the near future, we highly recommend that you review the 14 day weather forecast for Sarnia before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -7° | 11 | 17 | 3 | 22 mm | Awful | Sarnia in January |
| February | -1° / -7° | 8 | 15 | 5 | 23 mm | Awful | Sarnia in February |
| March | 5° / -3° | 7 | 21 | 3 | 27 mm | Awful | Sarnia in March |
| April | 11° / 3° | 8 | 21 | 1 | 39 mm | Ok | Sarnia in April |
| May | 18° / 9° | 7 | 24 | 0 | 36 mm | Good | Sarnia in May |
| June | 23° / 14° | 7 | 23 | 0 | 38 mm | Perfect | Sarnia in June |
| July | 26° / 18° | 7 | 24 | 0 | 30 mm | Perfect | Sarnia in July |
| August | 25° / 17° | 6 | 25 | 0 | 29 mm | Perfect | Sarnia in August |
| September | 22° / 14° | 6 | 24 | 0 | 29 mm | Good | Sarnia in September |
| October | 15° / 8° | 8 | 24 | 0 | 39 mm | Good | Sarnia in October |
| November | 8° / 2° | 8 | 22 | 1 | 26 mm | Ok | Sarnia in November |
| December | 2° / -3° | 9 | 19 | 3 | 24 mm | Awful | Sarnia in December |