ISRM 2014


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.

  • Average maximum temp: 19ºC / 66ºF
  • Average minimum temp: 7ºC / 45ºF
  • Lowest on record: -4ºC / 25ºF, Highest on record: 34ºC / 93ºF


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.

What to Pack for Montreal in May

  • Warm, water-resistant outerwear
  • Umbrella
  • Comfortable closed-toe shoes and water-resistant footwear, especially if you're going to be outside of the city
  • Sunhat, sunscreen
  • A range of clothing, including t-shirts, sweaters, light pants, heavy slacks. Dressing in layers is a good idea. Daytimes can be warm, but evenings can still be chilly

Montreal in May Perks

  • Warmer weather means visitors can enjoy more of Montreal great outdoor offerings
  • Springtime means the full throng of summer visitors has not yet arrived

Good to Know about Montreal in May

  • Victoria Day is a national holiday in Canada that falls on the Monday before May 25th. Government services, schools and banks will be closed Umbrella. Victoria Day weekend is a big travel holiday in Canada (commonly referred to as



Director: Lise Bujold
1-514-939-2710 ext. 1308

Congress Coordinator: Chantal Murphy
1-514-939-2710 ext. 1309

Technical Program Coordinator: Janet Sandor
1-514-939-2710 ext. 1320


General Chair: Ferri Hassani, McGill University
Co-Chairs: Jamie Archibald, Queen's University
John Hadjigeorgiou, University of Toronto

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