Weather Comparison
Side-by-side weather comparison for May
| Metric | Montreal | Boston | Better |
|---|---|---|---|
| Average HighHigher is warmer | 22°C (72°F) | 22°C (72°F) | Tie |
| Average LowHigher is milder | 10°C (50°F) | 10°C (50°F) | Tie |
| Rain DaysFewer is drier | 6 days | 6 days | Tie |
| PrecipitationLess is drier | 67 mm | 67 mm | Tie |
| Sunshine HoursMore is sunnier | 7h/day | 7h/day | Tie |
| HumidityLower is more comfortable | 65% | 65% | Tie |
| UV IndexLower is safer | 10 | 9▲ | Boston |
| Wind SpeedCalmer is better | 15 km/h | 15 km/h | Tie |
Montreal and Boston are closely matched in May. Neither city has a clear advantage across all metrics. Your decision should come down to personal preference, cultural interests, and travel logistics rather than weather alone.
Montreal sits in the comfortable travel range at 22°C. Boston is also comfortable at 22°C.
For travelers who prioritize dry weather, both cities are equally dry in May.
Montreal reaches an average high of 22°C (72°F) and drops to 10°C (50°F) at night during May. The daily temperature range is 12°C, meaning significant temperature swings between day and night.
Boston averages 22°C (72°F) for the high and 10°C (50°F) for the low, with a daily range of 12°C. The two cities feel quite similar in terms of temperature.
Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in May.
Montreal receives approximately 67 mm of rainfall across 6 rain days during May. Rain is occasional, so a light rain jacket should suffice.
Boston sees 67 mm over 6 rain days. Both cities are equally rainy this month.
Both cities share similar humidity levels at 65%.
Highs of 22°C, lows of 10°C, 6 rain days
Highs of 22°C, lows of 10°C, 6 rain days
Pack for both: light layers, a light jacket for evenings, sunscreen, a packable rain jacket, an umbrella. These items are useful in either destination during May.
The table below shows average high temperatures and rain days for every month. May is highlighted for quick reference.
| Month | Montreal | Boston | ||
|---|---|---|---|---|
| High | Rain | High | Rain | |
| Jan | 3°C | 3d | 4°C | 3d |
| Feb | 7°C | 3d | 8°C | 3d |
| Mar | 12°C | 4d | 13°C | 4d |
| Apr | 18°C | 5d | 19°C | 5d |
| May | 22°C | 6d | 22°C | 6d |
| Jun | 23°C | 6d | 24°C | 6d |
| Jul | 22°C | 6d | 22°C | 6d |
| Aug | 18°C | 5d | 19°C | 5d |
| Sep | 12°C | 4d | 13°C | 4d |
| Oct | 7°C | 3d | 8°C | 3d |
| Nov | 3°C | 3d | 4°C | 3d |
| Dec | 1°C | 3d | 3°C | 3d |
Montreal Weather in May
Full forecast, packing tips, and activities
Boston Weather in May
Full forecast, packing tips, and activities