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Calgary Weather in May
May in Calgary averages 17°C (63°F) during the day and 3°C (37°F) at night. Quite a bit of rainfall is typical this month, with around 79 mm (3.1 in) on average. An umbrella is a good idea.
Rainfall in Calgary in May
Based on our climate data of the past 30 years, about 10 days of rain are anticipated, with 79 mm (3.1 in) on average. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Calgary in May
In May, Calgary sees moderate temperatures, with highs of 17°C (63°F). Nights drop to around 3°C (37°F). The difference between afternoon and evening temperatures is usually noticeable. With lows around 3°C (37°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Calgary in May
The city usually sees around 250 hours of sunlight, indicating many sunny days , a great month for sightseeing.Our weather planner can help you find worldwide destinations with pleasant weather during this period. July and August typically offer the best weather for Calgary.
Calgary Temperature in May
Min Temperature
3°C (37°F)
Max Temperature
17°C (63°F)
Chance of Rain
34%
Precipitation
79 mm (3.1 in)
Rainy days
10 days
Humidity
43%
Sunshine
250 hours
Percentage Sunshine
52%
Calgary Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Calgary - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Calgary typically rise from around 14°C (57°F) at the start of May to approximately 18°C (64°F) by the end. Nights are cold, with lows typically ranging from 2°C (36°F) to 7°C (45°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather records for Calgary in May
Browse day-by-day weather records for Calgary spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Calgary historical weather extremes in May
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Calgary.
- Calgary recorded its highest May temperature of 31°C (88°F) on May 30, 1986.
- The coldest night in May in Calgary was on May 2, 1991, with a minimum of -8°C (18°F).
Best Places in Canada in May
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Calgary in May
Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Calgary in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling6/10 -
Walking6/10 -
Camping4/10 -
Outdoor sports9/10
Calgary 3-Day Forecast
More climate data for Calgary
Temperature Rainfall Sunshine Humidity
See the full Calgary climate overview or explore weather in Canada.
Popular in May
Where to go in May - average daytime high across popular destinations.
Niagara Falls
21°C (70°F) Montréal20°C (68°F) Ottawa20°C (68°F) Quebec City19°C (66°F) Calgary17°C (63°F) Vancouver16°C (61°F) Toronto16°C (61°F) Whistler11°C (52°F) Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
The 5 most beautiful lakes in Canada
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