Boston
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast
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September 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
September is a transitional month into autumn, and as such has varied weather. Generally, the extreme summer heat cools down considerably, as the temperature drops to the range of 57.4°F (14.1°C) and 72.3°F (22.4°C). The nights are cool and tolerable, but the early mornings get quite chilly.
Rainfall increases, albeit minimally, to fall for eight and a half days, collecting 87.4m in the rain gauge. Expect more tourists to visit Boston since the weather becomes stable and mild, without extreme hazards like thunderstorms and heat waves. Swimming, though, is not a regular activity, appreciative of the sea temperature dropping to 60.8°F (16°C). The lovers of cold water may take a few swims and later bask in the eight hours of daily sunshine.
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  • The average high temperature in September: 22.4°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 September: 14.1°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 September: 71.8%

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 September: 87.4mm

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 September: 8.6 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).

  • The average snowfall in September: 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 September: 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 September: 18.2°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 September: 12h

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 September: 7.9h

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 September: 6

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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