Click on a day for an hourly weather forecast
The temperatures in Guelph in August are comfortable with low of 15°C and and high up to 24°C.
You can expect about 3 to 8 days of rain in Guelph during the month of August. 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 Guelph in August 2025.
If you’re planning to visit Guelph in the near future, we highly recommend that you review the 14 day weather forecast for Guelph before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -10° | 8 | 4 | 22 | 105 mm | Awful | Guelph in January |
| February | -3° / -9° | 5 | 3 | 20 | 93 mm | Awful | Guelph in February |
| March | 3° / -4° | 8 | 9 | 14 | 108 mm | Awful | Guelph in March |
| April | 10° / 1° | 9 | 14 | 7 | 142 mm | Awful | Guelph in April |
| May | 18° / 8° | 8 | 22 | 1 | 132 mm | Ok | Guelph in May |
| June | 22° / 12° | 8 | 22 | 0 | 138 mm | Ok | Guelph in June |
| July | 25° / 15° | 9 | 22 | 0 | 154 mm | Good | Guelph in July |
| August | 24° / 15° | 7 | 24 | 0 | 133 mm | Good | Guelph in August |
| September | 21° / 11° | 5 | 25 | 0 | 93 mm | Good | Guelph in September |
| October | 13° / 6° | 9 | 20 | 2 | 134 mm | Awful | Guelph in October |
| November | 6° / 0° | 8 | 11 | 11 | 95 mm | Awful | Guelph in November |
| December | 0° / -4° | 8 | 5 | 19 | 102 mm | Awful | Guelph in December |