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
With the onset of September, Sudbury's climate undergoes a slight change as the average high-temperature moves from a moderately hot 81°F (27.2°C) in August to an agreeable 73.2°F (22.9°C). An average low-temperature of 55.8°F (13.2°C) is recorded in the month of September.Humidity
In Sudbury, the average relative humidity in September is 77%.Rainfall
September is the month with the least rainfall. Rain falls for 10.4 days and accumulates 1.18" (30mm) of precipitation.Snowfall
In Sudbury, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:11 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 6:28 pm EDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In Sudbury, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow in Sudbury?
Does it snow in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Sudbury, MA
- Average high temperature in September: 73.2°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (33.1°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in September
Sudbury, MA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Sudbury, MA
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Sudbury, MA
- Average humidity in September: 77%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).
Average rainfall in September
Sudbury, MA
- Average rainfall in September: 1.18"
The wettest month (with the highest rainfall) is March (2.4").
The driest month (with the least rainfall) is September (1.18").
Average rainfall days in September
Sudbury, MA
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in September
Sudbury, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.17").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Sudbury, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sudbury, 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 48min).
Average sunshine days in September
Sudbury, MA
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is April (13.2 days).
Average UV index in September
Sudbury, 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
Sudbury, MA
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Sudbury, MA
- Average visibility in September: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
Sudbury, Massachusetts, USA
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