30YearWeather
Boston in May
Boston weather in May - United States
🌤️Mild & Comfortable

Boston Weather in May

Plan your May trip to Boston, United States. Based on 30 years of NASA data, expect temperatures of 19°C (high) to 10°C (low), with 26% rain probability and 8 hours of daily sunshine. The Atlantic Ocean averages 13°C in May. Pack rain gear for around 11 rainy days.

Avg High
19°C

Hottest around day 31

Avg Low
10°C

Coolest around day 1

Rainy Days
11days

26% avg rain chance

Sunshine
8hrs/day

Spring season

Sea Temperature in May

Atlantic Ocean

12.7°C

Monthly Average

Water Feel
🥶Polar Plunge

Consider a wetsuit for extended swimming

Swim Rating
❄️Cold water hazard

Based on average sea surface temperature

Body of Water
Atlantic Ocean

Boston coastline

Boston May Weather Calendar

Click any day to see detailed weather information

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Connect

Greater Boston uses10-digit dialing. Th...

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for Boston

Smart Flight Estimator

Airport-to-Airport Logistics

unlock smart flight estimates

Add your home location in settings to see airport details.

Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Major Hub
84/ 100
Traffic Index

Extremely busy airport

Peak Daily Arrivals

0

slots per day

Peak

Aug

Low

Nov

Monthly Traffic Distribution

465
Jan
490
Feb
551
Mar
596
Apr
643
May
627
Jun
650
Jul
676
Aug
651
Sep
635
Oct
424
Nov
533
Dec
Traffic Level
Low Season

Key Connections

Washington Ronald Reagan National (DCA)
Chicago O'Hare (ORD)
New York John F Kennedy (JFK)
Philadelphia (PHL)
Atlanta Hartsfield Jackson (ATL)

Health & Safety Advisory

CDC travel health recommendations

No Requirements

No Special Vaccinations Required

Standard travel precautions apply

Source: CDC Travelers' Health

View Complete Health Guide

Is May a Good Time to Visit Boston?

👍Great time to visit - recommended
Short Answer

Don't expect beach weather in Boston's May: 12.7°C cold seas despite 19°C air temps. Coastal scenery remains beautiful, just pack warm layers.

Decision Factors

Peak tourist season

95% of annual peak - expect crowds and peak prices

Cold sea - swimming challenging

12.7°C sea temperature - Polar Plunge

Plenty of sunshine

9.5h of sunshine daily

Exceptional dining scene

26 Michelin-listed restaurants

Good For

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 19.1°C temperatures and low 26% rain risk

  • 👴
    Elderly travelers

    Comfortable 19.1°C temperature range with manageable humidity

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

  • 🌡️
    Heat-sensitive visitors

    Manageable 19.1°C without oppressive humidity

Who Should Avoid

  • 🏖️
    Beach lovers

    Sea temperature only 12.7°C - too cold for comfortable swimming

  • 💰
    Budget travelers

    Peak season means premium prices everywhere

930 observations30-year historical data
Confidence: 99%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Boston in May averages 19°C with 26% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Boston in May

What are the temperatures in Boston in May?

Daytime highs average 19°C, nights drop to 10°C. Temperatures remain fairly consistent.

How many rainy days in Boston in May?

Expect around 11 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Boston in May?

Layers are key. A medium-weight jacket and closed-toe shoes.

Is May peak season in Boston?

This is shoulder season—moderate prices and manageable crowds.