Weather in Toronto in August

Prime time. If you get to pick your dates, August is the one. Highs average 24.2 °C, lows 18.1 °C, and rain falls on 13 days — nothing in the month is working against you.

August is the highest-scoring month of the twelve. The nearest rival is September, and the month at the other end of the year is January.

Rain on 13 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average August reaches 30 °C. Across the twenty years measured, the hottest August day reached 31.5 °C and the coldest night fell to 10.8 °C, and the wettest single day dropped 29 mm — roughly 49% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 113 mm against 27 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 59 mm average is a reasonable planning figure, not a promise.

Wind is light at 11.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 72%.

How August sits in the year

Temperatures hold steady either side: 24.4 °C in July, 24.2 here, 20.8 in September. Nothing about the timing within the month matters much.

Daylight in August

14 hours of daylight, losing 1.3 hours across the month. That is between Toronto's extremes of 15.4 and 9 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 30.3 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Toronto versus nearby

If Toronto is one option among several, the nearby comparison is worth making. Hamilton is close enough to be a coin toss — 4.6 °C warmer, 2 days less rain. Barrie is close enough to be a coin toss — within a degree on temperature, 3 days less rain.

So: August is the answer for Toronto. If it is booked out or priced out, September is the next best thing at 0 points behind, and January is the month to keep off the shortlist.

Every month in Toronto

See all twelve months in Toronto, or where else to go in August.