September
Best time
17.1°C / 5.7°C
13 rain days
mild, rainy
Best time to visit Calgary
Calgary, Canada — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: September.
Best months to visit
OK — shoulder months
August
OK
22.9°C / 10.5°C
15 rain days
warm, rainy
- comfortable temperatures (avg high 22.9°C / 73°F)
July
OK
23.5°C / 11.2°C
18 rain days
warm, very wet
- comfortable temperatures (avg high 23.5°C / 74°F)
May
OK
16.9°C / 4°C
18 rain days
mild, very wet
October
OK
10.4°C / -0.3°C
13 rain days
cool, freezing nights, rainy
April
OK
10.6°C / -2.1°C
16 rain days
cool, freezing nights, very wet
Months to skip
June
Skip
20.7°C / 8.7°C
21 rain days
mild, very wet
- extremely wet (21 rain days)
March
Skip
4.6°C / -7.7°C
13 rain days
cold, freezing nights, rainy
- bitterly cold (overnight -7.7°C)
November
Skip
2.4°C / -7.2°C
12 rain days
cold, freezing nights, rainy
- bitterly cold (overnight -7.2°C)
January
Skip
-1.2°C / -11.3°C
11 rain days
cold, freezing nights, rainy
- bitterly cold (overnight -11.3°C)
December
Skip
-2.7°C / -12°C
10 rain days
cold, freezing nights, rainy
- bitterly cold (overnight -12°C)
February
Skip
-2.4°C / -13.5°C
13 rain days
cold, freezing nights, rainy
- bitterly cold (overnight -13.5°C)
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.