Boston, Massachusetts, United States climate

Average temperatures, precipitation and all-time records for Boston, Massachusetts, United States, with every day graded against ~45 years of local climate history (1981–2026). Its warmest month is July, averaging a high of 82°F, and its coldest is January, with an average low of 17°F.

Boston is the capital and most populous city of the U.S. state of Massachusetts. It serves as a cultural and financial center of New England, a region of the Northeastern United States. via Wikipedia

How today compares

Latest recorded day: 2026-07-21. Each reading placed on Boston, Massachusetts, United States's own ±7-day seasonal distribution.

High 81°F Normal · 45th pct

Low 61°F Below Normal · 32nd pct

Feels-like 80°F Below Normal · 38th pct

Humidity 14.3 g/m³ Below Normal · 39th pct

Wind 16 mph Near Record · 99th pct

Precip 0.34 in Heavy · 86th pct

Open Boston in the live weather grader →

Notable weather in Boston

The Blizzard of 1978 paralyzed Boston for a week, dropping about 27 inches of snow, stranding thousands of motorists, and flooding coastal neighborhoods. Read more →

Boston average temperatures by month

Typical daily high and low, and average precipitation, for each month in Boston, Massachusetts, United States, based on 1981–2026 records. The wettest month is January (0.10 in on an average day).

Month	Avg high	Avg low	Avg precip
January	32°F	17°F	0.10 in
February	35°F	19°F	0.10 in
March	43°F	26°F	0.10 in
April	55°F	36°F	0.10 in
May	65°F	45°F	0.10 in
June	74°F	56°F	0.10 in
July	82°F	63°F	0.10 in
August	81°F	62°F	0.10 in
September	74°F	54°F	0.10 in
October	62°F	44°F	0.10 in
November	49°F	34°F	0.10 in
December	37°F	24°F	0.10 in

Jan 2°–44°

Feb 7°–47°

Mar 16°–55°

Apr 28°–66°

May 38°–75°

Jun 49°–83°

Jul 57°–89°

Aug 55°–89°

Sep 46°–83°

Oct 35°–71°

Nov 25°–61°

Dec 13°–49°

Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -10°F to 115°F scale, so the whole year's rhythm reads at a glance.

Thinking of visiting Boston?

Trips live and die by the weather. See how Boston's comfort stacks up against where you live. Boston is pre-loaded, just add your city.

Compare Boston's comfort with your city →

Record extremes

Hottest day on record: 100°F on 2002-08-14
Coldest day on record: -15°F on 2015-02-24

All Boston weather records →

Percentiles compare each day to Boston, Massachusetts, United States's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →