Weather in Calgary in August

Prime time. August is about as good as Calgary gets. Highs average 24.2 °C, lows 10.4 °C, and rain falls on 10 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 February.

Rain on 10 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

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest August day reached 36.3 °C and the coldest night fell to 1.2 °C, and the wettest single day dropped 35 mm — roughly 57% 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 119 mm against 8 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 61 mm average is a reasonable planning figure, not a promise.

Wind is light at 3.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 63%.

How August sits in the year

Temperatures hold steady either side: 25 °C in July, 24.2 here, 18.9 in September. Nothing about the timing within the month matters much.

Daylight in August

14.6 hours of daylight, losing 1.7 hours across the month. That is between Calgary's extremes of 16.5 and 8 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 35 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. At 1048 m the air is thin enough to matter — sun that burns faster than the temperature suggests, and nights that cool off quickly.

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 Calgary versus nearby

If Calgary is one option among several, the nearby comparison is worth making. Banff is close enough to be a coin toss — 3.8 °C cooler, 3 days more rain. Lethbridge is close enough to be a coin toss — 2.6 °C warmer, 2 days less rain.

So: August is the answer for Calgary. If it is booked out or priced out, September is the next best thing at 2 points behind, and February is the month to keep off the shortlist.

Every month in Calgary

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