Montréal is warmest in July, averaging 28° by day and 17° at night. The wettest month is August with 105 mm, and the year brings about 899 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | -5° | -17° | 68 mm | 8.9 h | Cool |
| February | -3° | -15° | 53 mm | 10.1 h | Cool |
| March | 4° | -8° | 62 mm | 11.6 h | Cool |
| April | 11° | -0° | 84 mm | 13.3 h | Cool |
| May | 19° | 8° | 50 mm | 14.7 h | Sightseeing |
| June | 24° | 13° | 87 mm | 15.5 h | Sightseeing |
| July | 28° | 17° | 99 mm | 15.2 h | Beach weather |
| August | 27° | 16° | 105 mm | 13.9 h | Beach weather |
| September | 23° | 12° | 60 mm | 12.3 h | Sightseeing |
| October | 16° | 5° | 81 mm | 10.7 h | Mild |
| November | 7° | -3° | 63 mm | 9.2 h | Cool |
| December | -1° | -11° | 87 mm | 8.5 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: July and August — highs around 27°, nights no colder than 16°, and at most 105 mm of rain in a month.
Walking the city: May, June and September — highs of 19–24° and no more than 87 mm of rain a month.