May Weather in Montreal
The month of May is characterized by rapidly rising daily high temperatures, with daily highs increasing from 60°F to 69°F over the course of the month, exceeding 79°F or dropping below 50°F only one day in ten.
Over the course of May, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:06 hours, implying an average day-over-day increase of 2.1 minutes. The shortest day of the month is May 1 with 14:20 hours of daylight; the longest day is May 31 with 15:25 hours of daylight.
Visitors can expect rain about 11 days out of 31 in May.
The relative humidity typically ranges from 38% (comfortable) to 84% (humid) over the course of a typical May, rarely dropping below 21% (dry) and reaching as high as 99% (very humid). The air is driest around May 4, at which time the relative humidity drops below 47% (comfortable) three days out of four; it is most humid around May 24, rising above 77% (humid) three days out of four.
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