What is the Weather in Boston in September?

This post is an overview of the September weather in Boston, with tips on how to dress and things to do to help make the most of your trip. 

 


HOW HOT IS BOSTON IN SEPTEMBER?

September usually starts out warm in Boston but can end a bit on the cool side.

Daytime high temperatures tend to average in mid to upper 70s F (about 25 C) early in September but drop off into the mid-upper 60s F (19C to 20C) by the end of the month.

A few of the warmer afternoons early in the month reach into to mid-80s F (about 30C) with one day reaching 90 F (about 32C) or more about once every other year.

 

Average Temperatures September Boston

 

The record high temperature recorded in Boston during September was 100 F (37.8C)!

Late night and early morning low temperatures will be trending colder this month. Early in September, the lows tend to be in the lower 60s F (16C to 17C) but fall into the low to mid-50s F (11C to 12C) by the month’s end.

A few of the colder mornings towards the end of the month will dip down into the mid-40s F (6C to 7C). The record low in Boston during September was 38 F (3.3C).

In short, September is one of the best month of the year to take a free walking tour.

 

 


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HOW MUCH SUN & RAIN?

September is a good month to explore Boston as about 20 days this month will be either sunny or at least partly sunny.

Measurable rainfall occurs on 8-9 days but heavy rains of 0.5 inches (12.7 mm) or more only are expected on 2 days.

 

 

Boston in September Weather Calendar

  

You can expect just over 13 hours of daylight early in September but decreasing to just short of 12 hours by the end of the month.

 


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WHAT TO WEAR IN SEPTEMBER?

Summer is ending and September starts to become more fall-like so you will need to bring some summer attire as well as clothes for the cooler fall days.

Best to bring a sweater, windbreaker or light jacket for the cooler nights and mornings and don’t forget some good walking shoes.

 

What to Wear in Boston in September

 


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WHAT TO DO IN BOSTON IN SEPTEMBER?

Be sure to read our full post on what to do in Boston in September, which includes free things to do, night and family-friendly activities and attractions

You may also find our master post on the best things to do in Boston helpful as well.

And if you are planning on visiting many of Boston’s top attractions, then you should consider a tourist discount pass as you could save up to 50% of retail ticket prices to tours, attractions, and restaurants.

 

 

Some of the fun activities include: 

 


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Fred Pickhardt
Ocean Weather Services

Look into the weather in August and October, as well.