Weather in Québec in August

A good month. August is a solid month to be in Québec. You should expect rain on 16 days of the month, which is more days wet than dry.

August ranks 2 of 12 in Québec. Only September scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 16 days, 3 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 30.2 °C and the coldest night fell to 6.7 °C, and the wettest single day dropped 57 mm — roughly 53% 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 191 mm against 36 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 108 mm average is a reasonable planning figure, not a promise.

Wind is light at 3.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 84%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 24.1 °C in July, 23.3 here, 19.6 in September. Nothing about the timing within the month matters much.

Daylight in August

14.3 hours of daylight, losing 1.5 hours across the month. That is between Québec's extremes of 15.8 and 8.6 hours, so days are long enough not to constrain the plan.

An inland climate

Québec has no sea to moderate it, and it shows: 41.3 °C separates the hottest afternoon of the year from the coldest night. That is a genuinely continental range, and it means summer and winter here are barely the same place.

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 Québec versus nearby

If Québec is one option among several, the nearby comparison is worth making. Sherbrooke is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Saguenay is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: August is effectively as good as it gets here — 2 points behind September, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Québec

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