September weather forecast
Brookline, MA

A small league field in Brookline, Massachusetts, overlooking bright yellow trees in the fall, behind the cityscape of Boston
A small league field in Brookline, Massachusetts, overlooking bright yellow trees in the fall, behind the cityscape of Boston

Weather in September

The first month of the autumn, September, is still a pleasant month in Brookline, Massachusetts, with an average temperature ranging between min 56.7°F (13.7°C) and max 72.9°F (22.7°C).

Temperature

In September, the average high-temperature marginally drops from a warm 80.4°F (26.9°C) in August to a pleasant 72.9°F (22.7°C). The average low-temperature, in Brookline, is 56.7°F (13.7°C).

Humidity

In Brookline, the average relative humidity in September is 75%.

Rainfall

The month with the least rainfall in Brookline, Massachusetts, is September, when the rain falls for 6.4 days and typically collects 0.2" (5mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

In Brookline, the average length of the day in September is 12h and 28min.
On the first day of September in Brookline, sunrise is at 6:09 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:28 pm EDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index in Brookline is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Brookline?

In September, in Brookline, Massachusetts, the average high-temperature is 72.9°F (22.7°C), and the average low-temperature is 56.7°F (13.7°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in July is calculated to be 86°F (30°C).

What is the average humidity in September in Brookline?

In Brookline, Massachusetts, the average relative humidity in September is 75%.

What is the driest month in Brookline?

The month with the least rainfall in Brookline, Massachusetts, is September, when the rain falls for 6.4 days and typically collects 0.2" (5mm) of precipitation.

How many days does it rain in September in Brookline?

In September, in Brookline, the rain falls for 6.4 days. Throughout September, 0.2" (5mm) of precipitation is accumulated.

When it does not snow in Brookline?

In Brookline, snow does not fall in June through October.

How many hours of daylight does Brookline have in September?

The average day length in September is 12h and 28min.

When is the sunrise / sunset in September in Brookline?

On the first day of September in Brookline, Massachusetts, sunrise is at 6:09 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:28 pm EDT.

How long on average sun shines in September in Brookline?

The average sunshine duration in September in Brookline is 8.5h.

What is the UV index reading in September in Brookline?

In September, the average daily maximum UV index in Brookline is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Brookline, MA

Average temperature in September - Brookline, MA
  • Average high temperature in September: 72.9°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in September: 56.7°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

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Average pressure in September
Brookline, MA

Average pressure in September - Brookline, MA
  • Average pressure in September: 30.05"Hg

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

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Average wind speed in September
Brookline, MA

Average wind speed in September - Brookline, MA
  • Average wind speed in September: 6.6mph

The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in September
Brookline, MA

Average humidity in September - Brookline, MA
  • Average humidity in September: 75%

The months with the highest relative humidity are January and February (77%).
The month with the lowest relative humidity is April (69%).

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Average rainfall in September
Brookline, MA

Average rainfall in September - Brookline, MA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is November (0.63").
The driest month (with the least rainfall) is September (0.2").

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Average rainfall days in September
Brookline, MA

Average rainfall days in September - Brookline, MA
  • Average rainfall days in September: 6.4 days

The month with the highest number of rainy days is July (9.6 days).
The month with the least rainy days is January (4.3 days).

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Average snowfall in September
Brookline, MA

Average snowfall in September - Brookline, MA
  • Average snowfall in September: 0"

The month with the highest snowfall is December (0.71").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Brookline, MA

Average snowfall days in September - Brookline, MA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Brookline, MA

Average daylight in September / Average sunshine in September - Brookline, MA
  • Average daylight in September: 12h and 28min

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).

  • Average sunshine in September: 8h and 30min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in September
Brookline, MA

Average sunshine days in September - Brookline, MA
  • Average sunshine days in September: 21.8 days

The month with the most sunshine days is January (23.5 days).
The month with the least sunshine days is June (17.4 days).

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Average UV index in September
Brookline, MA

Average UV index in September - Brookline, MA
  • Average UV index in September: 4

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 cloud cover in September
Brookline, MA

Average cloud cover in September - Brookline, MA
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Brookline, MA

Average visibility in September - Brookline, MA
  • Average visibility in September: 6mi

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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