2026 Climate Averages

Weather: Boston — September

The weather is near-perfect with ideal temperatures and minimal rain. Recommended month to visit.

🌟 Climate Overview

September is an excellent time to visit Boston. Warm weather with highs of 22°C—great for outdoor activities. As peak season, expect higher prices and more tourists. At 19°C, the sea is too cold for most swimmers.

7.3
GoTripzi Score Great

Based on weather comfort, crowds, prices, and activity options

Avg High

22°C

Avg Low

15°C

Rainy days

9days

Daylight

12.6h

Rainfall

98mm

Sunshine

8.7h/day

Humidity

77%

Humid
Sun Strength

6

High
Wind

18 km/h (gusts 34)

Sea Temp

19°C ❄️ Cold

Is September a good time to visit Boston?

The weather is near-perfect with ideal temperatures and minimal rain.

Now

--

Feels like --
Wind --
Humidity --
UV Index --
Local time —

Air Quality

Travel Context

  • Crowds
    Very Busy
  • Travel Costs Peak Rates

Daylight

Sunrise

06:24

Sunset

18:58

12.6h daylight

Visiting Boston in September: Pros & Cons

Pros

  • Comfortable temperatures for sightseeing
  • One of the best months to visit

Cons

  • Peak season — expect crowds and higher prices

Things to Do in September

Recommended for This Weather

🚶 Walking tours & sightseeing
🚲 Cycling & bike tours
🥾 Hiking & nature trails
🍜 Food tours & culinary experiences
🎭 Cultural tours & local experiences

Boston Weather by Month

Month Avg High Avg Low Rain Sunshine Humidity UV Index Crowds Condition
Jan 4°C -3°C 10d (104mm) 5.8h
67% Humid
2.8 Moderate
Good
Feb 5°C -3°C 8d (80mm) 6.6h
66% Humid
4 Moderate
Good
Mar 9°C 1°C 12d (113mm) 7.9h
64% Moderate
5.7 High
Good
Apr 13°C 5°C 11d (97mm) 8.5h
65% Humid
6.9 High
Good
May 19°C 11°C 9d (84mm) 10.4h
69% Humid
8.6 Very High
Excellent
Jun 24°C 16°C 10d (66mm) 11h
74% Humid
8.8 Very High
Excellent
Jul 27°C 20°C 11d (93mm) 11h
76% Humid
8.4 Very High
Good
Aug 26°C 19°C 10d (70mm) 10.7h
75% Humid
7.6 Very High
Good
Sep Current 22°C 15°C 9d (98mm) 8.7h
77% Humid
6 High
Excellent
Oct 17°C 10°C 8d (97mm) 7.3h
75% Humid
4.3 Moderate
Excellent
Nov 12°C 4°C 8d (69mm) 7h
67% Humid
3.3 Moderate
Good
Dec 6°C -1°C 11d (123mm) 5.4h
70% Humid
2.3 Moderate
Good

⚖️Find Your Ideal Month

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5
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Your Best MonthAugScore: 7.4
1.Aug
7.42.Jul
73.Jun
5.64.Sep
5.65.Apr
5.16.Nov
5.17.Mar
4.78.May
4.79.Dec
4.710.Jan
4.311.Feb
4.312.Oct
3.4

Where to Stay

See hotels, apartments & rentals around Boston – live prices from Booking.com, Expedia, Vrbo and more

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Boston

Freedom Trail history, Fenway Park, Ivy-league vibes across the Charles, seafood, and harbor charm.

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What to Pack for September

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces. Pack a compact umbrella or light rain jacket for occasional showers. Don't forget a wide-brimmed hat and high-SPF sunscreen — the sun is strong.

Cool Very Busy

🎒Personalized Packing List

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📋Essentials
👕Clothing
👟Footwear
🎒Accessories
🧴Toiletries & Health

Planning a trip to Boston?

🔥 Peak season — book early for best rates

Frequently Asked Questions

Is September a good time to visit Boston?
September is typically excellent for visiting Boston, with average highs of 22°C and around 9 rainy days. Plan your activities accordingly—outdoor sightseeing is best on dry days, while rainy days are perfect for museums and indoor attractions.
Does it get cold at night in Boston in September?
Evenings in Boston during September are mild at 15°C. A light cardigan or long sleeves for evenings is usually enough. Outdoor dining remains comfortable, making it a great time to enjoy rooftop bars and terrace restaurants.
What should I pack for Boston in September?
With highs of 22°C and lows of 15°C in September, we recommend: Compact umbrella, Sunscreen SPF 30+, Sunglasses, Comfortable walking shoes. Layering is key as temperatures can vary between air-conditioned interiors and outdoors. Comfortable walking shoes are essential for cobblestone streets.
Does it rain a lot in Boston in September?
Boston typically sees around 9 rainy days in September. Rain is usually in the form of brief showers rather than all-day downpours, so a compact umbrella is sufficient. Mornings tend to be drier, making them ideal for outdoor sightseeing.
Can you swim in Boston in September?
September is suitable for swimming in Boston, though the water may feel refreshing at first. Air temperatures average 22°C, and most swimmers find it enjoyable once they're in. Midday is usually the warmest time for a dip.
How many hours of daylight are there in Boston in September?
In September, Boston gets approximately 12.6 hours of daylight per day. This affects how much sightseeing you can fit in—longer days mean more time for outdoor activities, while shorter days are perfect for cozy museum visits and early dinners.
Is September peak season in Boston?
Yes, September is peak season in Boston. Expect higher prices for accommodation and more crowds at popular attractions, but also the best weather conditions. Book hotels and major attractions in advance to secure availability and better rates.

Weather Data: Based on 2020–2025 historical climate data from Open-Meteo

Solar calculations: SunCalc (timezone: America/New_York)

Last Updated: February 2026

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