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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the BuzzLayer Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Calgary’s monthly weather swings from dry, frigid January lows near –15°C to warm July highs around 24°C, with Chinook winds often breaking winter’s grip. The city’s foothills location east of the Rockies creates a semi-arid, variable climate where snow can fall any month, but May and June bring the heaviest rain.
What are Calgary’s monthly temperature and precipitation averages?
January is the coldest month, averaging –8°C daytime highs and –16°C overnight lows. February stays similarly cold, though february weather calgary 2026 may bring typical Chinook-driven thaws. Spring arrives slowly: March highs reach 3°C, but snow remains common. By May, calgary weather in may in celsius averages a pleasant 17°C, with June the wettest month at about 80 mm of rain. July and August peak near 24°C, with low humidity. September cools to 19°C, and October drops to 11°C before winter returns.
For precise planning, check calgary weather monthly averages from the live forecast above. These data reflect the 1991–2020 normals, but Calgary’s notorious variability means actual daily conditions can differ sharply.
How reliable are long-range monthly forecasts for Calgary?
Extended outlooks like calgary weather 60 days or calgary weather next 30 days celsius offer broad trends—such as above-normal temperatures or precipitation—but lose accuracy beyond two weeks. Calgary historical weather monthly records from Environment Canada remain the best baseline for planning trips or outdoor events, especially in shoulder seasons like May and September when weather can flip quickly.
Does Calgary have a rainy season?
Yes, late spring through early summer is the wettest period. June averages about 80 mm of rain, but heavy downpours can occur anytime. July and August are drier, with frequent afternoon thunderstorms.
How often do Chinook winds affect Calgary’s winter?
Chinooks occur roughly 20–30 times each winter, raising temperatures by 10–20°C within hours. They can melt snow quickly but also bring strong, gusty winds that may last a few days.
What is the best month to visit Calgary for mild weather?
July and August offer the warmest, sunniest conditions, with average highs around 24°C and low humidity. May and September are also pleasant but cooler, and more rain or snow is possible.
Sources
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