Click on a day for an hourly weather forecast
The temperatures in Mississauga in August are comfortable with low of 18°C and and high up to 26°C.
You can expect rain for roughly half of the month of August in Mississauga. 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.
Our weather forecast can give you a great sense of what weather to expect in Mississauga in August 2025.
If you’re planning to visit Mississauga in the near future, we highly recommend that you review the 14 day weather forecast for Mississauga before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -7° | 6 | 5 | 20 | 103 mm | Awful | Mississauga in January |
| February | -1° / -7° | 6 | 4 | 19 | 115 mm | Awful | Mississauga in February |
| March | 5° / -2° | 9 | 10 | 12 | 114 mm | Awful | Mississauga in March |
| April | 11° / 3° | 10 | 14 | 6 | 144 mm | Awful | Mississauga in April |
| May | 18° / 9° | 7 | 23 | 0 | 141 mm | Ok | Mississauga in May |
| June | 23° / 14° | 7 | 23 | 0 | 160 mm | Good | Mississauga in June |
| July | 26° / 18° | 9 | 22 | 0 | 168 mm | Good | Mississauga in July |
| August | 26° / 18° | 8 | 23 | 0 | 163 mm | Good | Mississauga in August |
| September | 22° / 15° | 6 | 24 | 0 | 118 mm | Good | Mississauga in September |
| October | 15° / 9° | 9 | 21 | 1 | 145 mm | Ok | Mississauga in October |
| November | 8° / 3° | 7 | 15 | 8 | 103 mm | Awful | Mississauga in November |
| December | 2° / -2° | 8 | 8 | 16 | 112 mm | Awful | Mississauga in December |