July weather forecast and climate
Boston, MA

A beautiful natural park with the George Washington Monument in Boston, Massachusetts, with a sneak view of the city skyscrapers
A beautiful natural park with the George Washington Monument in Boston, Massachusetts, with a sneak view of the city skyscrapers
Summer continues in July, with the temperature rising to the range of 65.5°F (18.6°C) and 81.3°F (27.4°C). July is Boston's hottest month and occasionally has the temperature rising above 86°F (30°C).
The weather is mildly varied, and as such, cool and wet days are not unusual. Heatwaves are a common occurrence, especially on the hottest days when the temperature hits 95°F (35°C).
July has approximately nine and a half rainfall days and 3.4" (86.4mm) precipitation. Most days are hot as there are nearly ten hours of sunshine per day.
Discovering Boston becomes more adventurous in the evening, with the daylight hours being extended to fifteen. In July, the sea temperature is 62.6°F (17°C), and the brave can already take a few dips in the ocean to keep off the high temperature. Expect the afternoon showers to be accompanied by thunderstorms.

What is the warmest month in Boston?

The warmest month in Boston, Massachusetts, is July, with an average high-temperature of 81.3°F (27.4°C) and an average low-temperature of 65.5°F (18.6°C).

What is the temperature in July in Boston?

The average high-temperature, in July, in Boston, Massachusetts, is 81.3°F (27.4°C), while the average low-temperature is 65.5°F (18.6°C).

How much does it rain in Boston in July?

In Boston, Massachusetts, during July, the rain falls for 9.6 days and regularly aggregates up to 3.4" (87.1mm) of precipitation.

What is the sea temperature in July in Boston?

The average seawater temperature, in July, in Boston, is 65.7°F (18.7°C). For swimming, a surface water temperature of 65.7°F (18.7°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).
Average temperature in July - Boston, MA
  • Average high temperature in July: 27.4°C

The warmest month (with the highest average high temperature) is July (27.4°C).
The month with the lowest average high temperature is January (2.1°C).

  • Average low temperature in July: 18.6°C

The month with the highest average low temperature is July (18.6°C).
The coldest month (with the lowest average low temperature) is January (-5.4°C).

Average humidity in July - Boston, MA
  • Average humidity in July: 68.4%

The month with the highest relative humidity is September (71.8%).
The month with the lowest relative humidity is February (62%).

Average rainfall in July - Boston, MA
  • Average rainfall in July: 87.1mm

The wettest month (with the highest rainfall) is March (109.7mm).
The driest month (with the lowest rainfall) is February (82.6mm).

Average rainfall days in July - Boston, MA
  • Average rainfall days in July: 9.6 days

The month with the highest number of rainy days is May (12 days).
The month with the lowest number of rainy days is September (8.6 days).

Average snowfall in July - Boston, MA
  • Average snowfall in July: 0mm

The month with the highest snowfall is January (327.7mm).
Months with the lowest snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in July - Boston, MA
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (6.7 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average sea temperature in July - Boston, MA
  • Average sea temperature in July: 18.7°C

The best month for swimming (with the highest average sea temperature) is August (20°C).
The coldest month (with the lowest average sea temperature) is February (3.4°C).

Average daylight in July / Average sunshine in July - Boston, MA
  • Average daylight in July: 14.9h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in July: 9.7h

The month with most sunshine is July (Average sunshine: 9.7h).
The month with least sunshine is December (Average sunshine: 4.6h).

Average UV index in July - Boston, MA
  • Average UV index in July: 8

Months with the highest UV index are June, July and August (UV index 8).
Months with the lowest UV index are January and December (UV index 1).

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