Boston
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast

Monthly 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
January, the same as December, is another cold winter month in Boston, Massachusetts, with average temperature ranging between max 34.2°F (1.2°C) and min 22.6°F (-5.2°C). January is the coldest month, with an average high-temperature of 34.2°F (1.2°C) and an average low-temperature of 22.6°F (-5.2°C). Weather in January »

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

The first month of the spring, March, is a chilly month in Boston, Massachusetts, with temperature in the range of an average high of 43.5°F (6.4°C) and an average low of 30.9°F (-0.6°C). In March, the average high-temperature slightly increases, from a wintry 36.5°F (2.5°C) in February, to a chilly 43.5°F (6.4°C). Weather in March »

April in Boston, Massachusetts, is a fresh spring month, with temperature in the range of an average high of 55.2°F (12.9°C) and an average low of 40.5°F (4.7°C). In April, the average high-temperature increases, from a frosty 43.5°F (6.4°C) in March, to a fresh 55.2°F (12.9°C). Weather in April »

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

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

July, like June, in Boston, Massachusetts, is a moderately hot summer month, with average temperature ranging between max 81.7°F (27.6°C) and min 64.9°F (18.3°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 calculated to a hot 86.5°F (30.3°C). Weather in July »

The last month of the summer, August, is also a moderately hot month in Boston, Massachusetts, with average temperature varying between 80.4°F (26.9°C) and 64°F (17.8°C). In Boston, the average high-temperature is relatively the same as in July - a still moderately hot 80.4°F (26.9°C). Weather in August »

September, the first month of the autumn, in Boston, is also an agreeable month, with 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 an agreeable 72.7°F (22.6°C). Weather in September »

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

The last month of the autumn, November, is also a frosty month in Boston, Massachusetts, 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 Boston, the average high-temperature in November decreases, from a comfortable 61.5°F (16.4°C) in October, to a frosty 49.5°F (9.7°C). Weather in November »

The first month of the winter, December, is also a wintry month in Boston, Massachusetts, with average temperature fluctuating between 39.9°F (4.4°C) and 29.7°F (-1.3°C). In Boston, the average high-temperature decreases, from a frosty 49.5°F (9.7°C) in November, to a wintry 39.9°F (4.4°C). Weather in December »

What is the coldest month in Boston?

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.

How much does it rain in Boston?

In Boston, Massachusetts, during the entire year, the rain falls for 141.4 days and collects up to 27.2" (691mm) of precipitation.

When does it snow in Boston?

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

How many days does it snow in Boston?

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

When is the lowest UV index in Boston?

Months with the lowest UV index in Boston, Massachusetts, are January through March, November and December, with an average maximum UV index of 2.

What is the most humid month in Boston?

The most humid month is February, with an average relative humidity of 77%.

What is the snowiest month in Boston?

February is the month with the most snowfall. Snow falls for 7.6 days and accumulates 4.72" (120mm) of snow.

When is the ocean coldest in Boston?

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

What is the month with the least sunshine in Boston?

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

What is the wettest month in Boston?

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

What is the least humid month in Boston?

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

When it does not snow in Boston?

June through September are months without snowfall in Boston, Massachusetts.

When are the longest days in Boston?

The month with the longest days is June, with an average of 15.2h of daylight.

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

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

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?

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

What month has the most sunshine in Boston?

The month with the most sunshine is August, with an average of 10.5h of sunshine.

What is the driest month in Boston?

September is the month with the least rainfall. Rain falls for 10 days and accumulates 1.26" (32mm) of precipitation.

What is the month with the shortest days in Boston?

With an average of 9.1h of daylight, December has the shortest days of the year in Boston.
Average temperature - Boston, MA
Average rainfall - Boston, MA

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

Average rainfall days - Boston, MA

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

Average snowfall - Boston, MA
Average snowfall days - Boston, MA

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

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).

Average daylight / Average sunshine - Boston, MA
Average UV index - Boston, MA