Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The beginning of September subtly marks a decrease in the average high-temperature, transitioning from a moderately hot 80.4°F (26.9°C) in August to an agreeable 72.9°F (22.7°C). Brookline experiences an average low-temperature reading of 56.7°F (13.7°C) throughout September.Humidity
The average relative humidity in September is 75%.Rainfall
September is the month with the least rainfall in Brookline. Rain falls for 6.4 days and accumulates 0.2" (5mm) of precipitation.Snowfall
In Brookline, snow does not fall in June through October.Daylight
In Brookline, Massachusetts, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:10 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:27 pm EDT.
Sunshine
In Brookline, the average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 4 during September translates into the following guidance:
Ensure safety - Sun damage prevention is strongly urged. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Experience reduced UV exposure by about half when donning a wide-brim hat.
Frequently asked questions
What is the usual temperature for Brookline in September?
What is the average humidity in September in Brookline?
What is the driest month in Brookline?
How many days does it rain in September in Brookline?
When it does not snow in Brookline?
How many hours of daylight does Brookline have in September?
When are sunrise and sunset in September in Brookline?
How many hours of sunshine does Brookline have in September?
What is the UV index reading in September in Brookline?
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in September /
Average sunshine in September
Brookline, MA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 3min
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).
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).
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).
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).
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).
Brookline, Massachusetts, USA
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