Climate and monthly weather forecast
Boston, MA

A beautiful natural park with the George Washington Monument in Boston, Massachusetts
A beautiful natural park with the George Washington Monument in Boston, Massachusetts

Weather in January

January, like December, in Boston, Massachusetts, is a wintry winter month, with an average temperature varying between 34.2°F (1.2°C) and 22.6°F (-5.2°C). With an average high-temperature of 34.2°F (1.2°C) and an average low-temperature of 22.6°F (-5.2°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Boston, is also a wintry month, with an average temperature fluctuating between 23.5°F (-4.7°C) and 36.5°F (2.5°C). In Boston, the average high-temperature in February is almost the same as in January - a still cold 36.5°F (2.5°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Boston, Massachusetts, with an average temperature ranging between max 43.5°F (6.4°C) and min 30.9°F (-0.6°C). In March, the average high-temperature marginally rises from a wintry 36.5°F (2.5°C) in February to a chilly 43.5°F (6.4°C). Weather in March »

Weather in April

April in Boston, Massachusetts, is a cool spring month, with an average temperature ranging between min 40.5°F (4.7°C) and max 55.2°F (12.9°C). In Boston, the average high-temperature in April rises from a frosty 43.5°F (6.4°C) in March to a fresh 55.2°F (12.9°C). Weather in April »

Weather in May

The last month of the spring, May, is an enjoyable month in Boston, Massachusetts, with temperature in the range of an average high of 66.4°F (19.1°C) and an average low of 50°F (10°C). In May, the average high-temperature rises from a cool 55.2°F (12.9°C) in April to an enjoyable 66.4°F (19.1°C). Weather in May »

Weather in June

June, the first month of the summer in Boston, is a warm month, with an average temperature varying between 74.3°F (23.5°C) and 57.6°F (14.2°C). In Boston, the average high-temperature in June slightly increases from a comfortable 66.4°F (19.1°C) in May to a moderately hot 74.3°F (23.5°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Boston, Massachusetts, with an average temperature fluctuating between 64.9°F (18.3°C) and 81.7°F (27.6°C). The warmest month is July, with an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 64.9°F (18.3°C). In July, the average heat index is estimated at a tropical 86.5°F (30.3°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Boston, Massachusetts, with an average temperature fluctuating between 64°F (17.8°C) and 80.4°F (26.9°C). In Boston, the average high-temperature in August is essentially the same as in July - a still warm 80.4°F (26.9°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Boston, Massachusetts, with an average temperature ranging between max 72.7°F (22.6°C) and min 57.4°F (14.1°C). In Boston, the average high-temperature in September marginally drops from a warm 80.4°F (26.9°C) in August to a pleasant 72.7°F (22.6°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Boston, Massachusetts, with an average temperature varying between 61.5°F (16.4°C) and 48.4°F (9.1°C). In Boston, the average high-temperature in October decreases from an agreeable 72.7°F (22.6°C) in September to a comfortable 61.5°F (16.4°C). Weather in October »

Weather in November

November, the last month of the autumn in Boston, is another chilly month, with temperature in the range of an average low of 37.9°F (3.3°C) and an average high of 49.5°F (9.7°C). In November, the average high-temperature drops from an enjoyable 61.5°F (16.4°C) in October to a frosty 49.5°F (9.7°C). Weather in November »

Weather in December

December, the first month of the winter in Boston, is still a cold month, with an average temperature fluctuating between 39.9°F (4.4°C) and 29.7°F (-1.3°C). In December, the average high-temperature decreases from a chilly 49.5°F (9.7°C) in November to a cold 39.9°F (4.4°C). Weather in December »
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FAQ

What is the coldest month in Boston?

The coldest month is January, with an average high-temperature of 34.2°F (1.2°C) and an average low-temperature of 22.6°F (-5.2°C).

How much does it rain in Boston?

Throughout the year, there are 141.4 rainfall days, and 27.2" (691mm) of precipitation is accumulated.

When does it snow in Boston?

Months with snowfall in Boston are January through May, October through December.

How much does it snow in Boston?

In Boston, Massachusetts, during the entire year, snow falls for 29.8 days and aggregates up to 15.75" (400mm) of snow.

What is the month with the lowest UV index in Boston?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the most humid month in Boston?

February is the most humid month in Boston, with an average relative humidity of 77%.

When does it snow the most in Boston?

The month with the most snowfall in Boston, Massachusetts, is February, when snow falls for 7.6 days and typically aggregates up to 4.72" (120mm) of snow.

What month is the ocean coldest in Boston?

February is the month with the coldest seawater, with an average ocean temperature of 38.1°F (3.4°C).

What is the month with the least sunshine in Boston?

With an average of 4.6h of sunshine, February has the least sunshine of the year in Boston, Massachusetts.

What is the wettest month in Boston?

The wettest months are March, April and December, with an average 2.91" (74mm) of rainfall.

When is Daylight Saving Time (DST) in Boston?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Boston, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Boston?

With an average relative humidity of 69%, April is the least humid month in Boston, Massachusetts.

When it does not snow in Boston?

June through September are months without snowfall in Boston.

When are the longest days in Boston?

June has the longest days of the year, with an average of 15h and 14min of daylight.

What is the month with the highest UV index in Boston?

June through August, with an average maximum UV index of 6, are months with the highest UV index in Boston.

What is the warmest month in Boston?

With an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 64.9°F (18.3°C), July is the warmest month in Boston, Massachusetts.

What month is the ocean warmest in Boston?

With an average ocean temperature of 68°F (20°C), August is the month with the warmest seawater.

What month has the most sunshine in Boston?

With an average of 10.5h of sunshine, August has the most sunshine of the year.

What is the driest month in Boston?

The month with the least rainfall is September, when the rain falls for 10 days and typically collects 1.26" (32mm) of precipitation.

What is the month with the shortest days in Boston?

December has the shortest days of the year, with an average of 9h and 8min of daylight.

Average temperature
Boston, MA

Average temperature - Boston, MA

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (34.2°F).

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

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Average pressure
Boston, MA

Average pressure - Boston, MA

The month with the highest atmospheric pressure is November (30.06").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed
Boston, MA

Average wind speed - Boston, MA

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average rainfall
Boston, MA

Average rainfall - Boston, MA

The wettest months (with the highest rainfall) are March, April and December (2.91").
The driest month (with the least rainfall) is September (1.26").

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Average rainfall days
Boston, MA

Average rainfall days - Boston, MA

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall
Boston, MA

Average snowfall - Boston, MA

The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Boston, MA

Average snowfall days - Boston, MA

The months with the highest number of snowfall days are January and February (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature
Boston, MA

Average sea temperature - Boston, MA

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (38.1°F).

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Average daylight / Average sunshine
Boston, MA

Average daylight / Average sunshine - Boston, MA

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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Average sunshine days
Boston, MA

Average sunshine days - Boston, MA

The month with the most sunshine days is September (17.7 days).
The month with the least sunshine days is April (13 days).

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Average UV index
Boston, MA

Average UV index - Boston, MA

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average visibility
Boston, MA

Average visibility - Boston, MA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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