30YearWeather
Boston in September
Boston weather in September - United States
😊Warm & Pleasant

Boston Weather in September

Plan your September trip to Boston, United States. Based on 30 years of NASA data, expect temperatures of 23°C (high) to 14°C (low), with 21% rain probability and 8 hours of daily sunshine. The Atlantic Ocean averages 19°C in September. Great conditions with only 4 rainy days expected.

Avg High
23°C

Hottest around day 1

Avg Low
14°C

Coolest around day 30

Rainy Days
4days

21% avg rain chance

Sunshine
8hrs/day

Autumn season

Sea Temperature in September

Atlantic Ocean

19.1°C

Monthly Average

Water Feel
🏊Pleasant

Comfortable for most swimmers

Swim Rating
👍Good for swimming

Based on average sea surface temperature

Body of Water
Atlantic Ocean

Boston coastline

Boston September 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

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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 September a Good Time to Visit Boston?

👌Decent conditions for most activities
Short Answer

September brings storm season risk to Boston. While typical weather is 23°C with 21% rain, plan for potential disruptions and secure cancellation-friendly bookings.

Decision Factors

Atlantic Hurricane season active

Atlantic zone - expect potential atlantic hurricane activity

Peak tourist season

96% of annual peak - expect crowds and peak prices

Ideal temperature range

23°C - perfect for sightseeing and outdoor activities

Plenty of sunshine

8.8h of sunshine daily

Exceptional dining scene

26 Michelin-listed restaurants

Good For

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 23°C temperatures and low 21% rain risk

  • 🥾
    Outdoor enthusiasts

    Ideal hiking conditions: 23°C, 21% rain chance

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

  • 💑
    Honeymoon couples

    Wedding score 97/100 with romantic weather conditions

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

Who Should Avoid

  • 💰
    Budget travelers

    Peak season means premium prices everywhere

  • 👴
    Elderly travelers

    75% humidity creates difficult conditions

  • 💼
    Business travelers

    Storm season may cause flight disruptions

900 observations30-year historical data
Confidence: 99%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Boston in September averages 23°C with 21% precipitation probability."

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

Frequently Asked Questions: Boston in September

What are the temperatures in Boston in September?

Daytime highs average 23°C, nights drop to 14°C. Temperatures remain fairly consistent.

How many rainy days in Boston in September?

Expect around 4 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Boston in September?

Comfortable casual wear with a light jacket for evenings.

Is September peak season in Boston?

This is typically peak season with higher prices. Book 2-3 months ahead.