Massachusetts weather in September

The state broadly agrees with itself in September: afternoons run 73° in Boston and 73° in Cape Cod, with everywhere else in between.

Based on 2 weather stations. Two stations — Boston and the Cape, where the ocean softens winter and holds spring back; the Berkshires out west run colder than both.

Boston

Highs near 73°, nights around 58°, and 3.6 in of rain in a typical September.

Place	Highs / lows	Wet days	The short version
Boston	73° / 58°	6	Bright afternoons, and a real chill once the sun drops.

Cape Cod

Highs near 73°, nights around 56°, and 3.9 in of rain in a typical September.

Place	Highs / lows	Wet days	The short version
Cape Cod	73° / 56°	5	Warm water, cool nights, and the crowds simply gone.

Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.

Where to go in September, across the whole country ›