Overall on the next 14 days there will be 1 days with snow in Sarnia and a total of 0.3 cm of snow.
It will be snowy on the following days:
Sarnia weather in May 2026
Click on a day for an hourly weather forecast
Wednesday
May 13
2 mm
13° / 5°
Thursday
May 14
0.8 mm
10° / 5°
Friday
May 15
0 mm
13° / 5°
Saturday
May 16
0 mm
23° / 10°
Sunday
May 17
0 mm
22° / 7°
Monday
May 18
1.3 mm
24° / 17°
Tuesday
May 19
28.3 mm
10° / 8°
Wednesday
May 20
0.8 mm
14° / 7°
Thursday
May 21
0.3 mm
13° / 6°
Friday
May 22
3.8 mm
23° / 11°
Saturday
May 23
9 mm
12° / 6°
Sunday
May 24
0.3 cm
7° / 3°
Monday
May 25
0 mm
11° / 4°
Tuesday
May 26
3.5 mm
16° / 9°
🌨️ Snowy days in Sarnia 2026 (May)
The average weather in Sarnia in May
The temperatures in Sarnia in May are quite cold with temperatures between 9°C and 18°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Sarnia during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Sarnia in May 2026.
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.
Temperatures
18° / 9°
Rainy Days
7
Snowy Days
0
Dry Days
24
Rainfall
36
mm
Sun Hours
2.0
Hrs
Historic average weather for May
Click on a day for an hourly weather forecast
Explore the weather in Sarnia in other months
Sarnia annual weather
| 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 |
Temperatures in Sarnia in May
Rain in Sarnia in May
Weather in Sarnia in May - FAQ
What is the average temperature in Sarnia in May?
The average temperature in Sarnia in May is 9/18° C.
What is the chance of rain in Sarnia in May?
On average, there are 7 rainy days in Sarnia during May.
Weather wise, is May a good time to visit Sarnia?
The weather in Sarnia in May is good.
Can it snow in Sarnia in May?
On average, there are 0 snowy days in Sarnia in May.
More about the weather in Sarnia