Calgary is warmest in July, averaging 25° by day and 10° at night. The wettest month is June with 123 mm, and the year brings about 585 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | -3° | -11° | 16 mm | 8.2 h | Cool |
| February | -2° | -13° | 31 mm | 9.7 h | Cool |
| March | 3° | -8° | 28 mm | 11.5 h | Cool |
| April | 8° | -3° | 48 mm | 13.6 h | Cool |
| May | 15° | 2° | 93 mm | 15.3 h | Mild |
| June | 20° | 7° | 123 mm | 16.3 h | Mild |
| July | 25° | 10° | 56 mm | 15.9 h | Sightseeing |
| August | 24° | 9° | 65 mm | 14.4 h | Sightseeing |
| September | 20° | 5° | 33 mm | 12.4 h | Sightseeing |
| October | 11° | -2° | 28 mm | 10.4 h | Cool |
| November | 2° | -7° | 33 mm | 8.6 h | Cool |
| December | -3° | -11° | 31 mm | 7.7 h | Cool |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: No month in Calgary combines swimming warmth with dry skies.
Walking the city: July, August and September — highs of 20–25° and no more than 65 mm of rain a month.