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
September sees a slight reduction in average high-temperature, with a shift from a warm 80.4°F (26.9°C) in August to a pleasant 72.9°F (22.7°C). Throughout September, an average low-temperature of 56.7°F (13.7°C) is expected.Humidity
In September, the average relative humidity is 75%.Rainfall
The month with the least rainfall 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 in Cambridge.Daylight
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
The average sunshine in September is 8.5h.UV index
In Cambridge, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 4 in September translates into this advice:
Heed the precautions - Suggestions to avoid sunburn are made. To avoid the Sun's strongest rays, limit exposure around the mid-day period. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Cambridge have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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
Cambridge, 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).
Cambridge, Massachusetts, USA
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