Avg High
Boston in May
Verdict
In Boston, May has a distinct spring feel. As the season moves along, temperatures are climbing noticeably. You can usually expect a mild month that feels variable day to day. It often has a mild but frequently damp, typical of changeable seasons feel, especially for outdoor plans.
It suits travellers who want straightforward weather for sightseeing and day trips. Lookouts and coastal walks can feel sharper when the wind is up.
Avg Low
Rain
Daylight
15h
What to expect
- Temperature feel - Easygoing temperatures with a noticeable cool-down after sunset. Breezes and shade can make it feel cooler.
- Rain pattern - Frequent rain spells. Expect damp surfaces and slick paths. Rain can be part of the daily rhythm.
- Midday sun - Sun protection matters. Cloud cover doesn't always mean low UV, so still protect your skin. Shade breaks feel genuinely worthwhile.
- Wind feel - Often breezy, and expect sharp gusts that can change plans in exposed areas. Sheltered streets can feel fine, but open areas feel very different.
May in context
How it compares to the rest of the year in Boston.
Hottest (avg)
#5 / 12
Wettest (avg)
#9 / 12
Daylight Hours
#3 / 12
Windiest (avg)
#8 / 12
Highest UV
#3 / 12
Most Humid
#8 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 14.6 hours
- UV index (max)
- 8
- Typical sun hours
- 04:22 – 18:59
Rain & Snow
- Total
-
- Rainy days
- 14
- Cloud cover
- 63%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 72%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is May a good time to visit Boston?
Typical May days in Boston reach highs of 19°C (66°F) with nights around 9°C (48°F). It usually feels mild by day and cool after dark. Overall, May sits in the middle of the Boston climate range.
What are temperatures like in May?
In May, you can usually expect highs of 19°C (66°F) and lows near 9°C (48°F). That means mild days and cool nights, so pack layers you can add or remove.
How much does it rain in May?
Rainfall in May averages 86 mm (3.4 in) across roughly 14 days. Overall it is a quite rainy time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in May?
You can expect about 15 hours of daylight in May. Sunrise is typically around 04:22 and sunset near 18:59. You get long days with comfortable amounts of daylight.
How strong is the sun in May?
UV levels are often high (around 8). Regular sunscreen and a hat are recommended.
Is it windy in May?
In May, average wind speeds are around 13 km/h (8 mph), with gusts on the windiest days reaching about 54 km/h (34 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.