Boston
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast
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August weather forecast and Climate
Boston, MA

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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
August in Boston is a moderately dry month, receiving mildly low rainfall of approximately 3.4" (86.4mm), collected from an average of nine days.
The mercury is in the high range of 64.6°F (18.1°C) and 79.5°F (26.4°C), with occasional days when the temperature rises as high as 86°F (30°C) or more.
There are up to ten sunshine hours per day, and it becomes essential to cover up while in the sun since the UV index is at its highest. The average sea temperature in August is 64.4°F (18°C), the highest recording of the year. Swimming and other sea activities become vibrant, even with the mildly cool water, as water temperature of above 64.4°F (18°C) is rare.
Being the peak of summer, tourists continue to enjoy the festivities in Boston until late into the evening appreciative of the extended daylight hours.
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  • The average high temperature in August: 26.4°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).

  • The average low temperature in August: 18.1°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).

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  • The average humidity in August: 70.8%

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

  • The average rainfall in August: 85.1mm

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

  • The average rainfall days in August: 9.4 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).

  • The average snowfall in August: 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).

  • The average snowfall days in August: 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).

  • The average sea temperature in August: 20°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).

  • The average daylight in August: 14h

Months with the longest days are May, June and July (Average daylight: 15h).
Months with shortest days are January and December (Average daylight: 9h).

  • The average sunshine in August: 8.9h

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

  • The average UV index in August: 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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