September weather forecastChilmark, MA
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Chilmark, Massachusetts, with temperature in the range of an average high of 68.2°F (20.1°C) and an average low of 63.7°F (17.6°C).Temperature
As September arrives, Chilmark's weather displays a minor decrease in high-temperatures, transitioning from August's warm 73.9°F (23.3°C) to a pleasant 68.2°F (20.1°C). September records a small disparity from daytime temperatures, marking an average low-temperature of 63.7°F (17.6°C) in Chilmark.Humidity
In September, the average relative humidity is 79%.Rainfall
In Chilmark, during September, the rain falls for 11.4 days and regularly aggregates up to 1.85" (47mm) of precipitation. In Chilmark, during the entire year, the rain falls for 146.4 days and collects up to 25.47" (647mm) of precipitation.Snowfall
April through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:10 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:39 am and sunset at 6:26 pm EDT.
Sunshine
In Chilmark, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The average daily UV index of 5 in September transforms into the following instructions:
Heed the precautions - Suggestions to avoid sunburn are made. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chilmark, MA
- Average high temperature in September: 68.2°F
The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is January (38.7°F).
- Average low temperature in September: 63.7°F
The month with the highest average low temperature is August (69.4°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in September
Chilmark, 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 (29.94"Hg).
Average wind speed in September
Chilmark, MA
- Average wind speed in September: 12.6mph
The windiest month (with the highest average wind speed) is January (16.2mph).
The calmest months (with the lowest average wind speed) are July and August (10.9mph).
Average humidity in September
Chilmark, MA
- Average humidity in September: 79%
The months with the highest relative humidity are May, June and July (83%).
The month with the lowest relative humidity is November (74%).
Average rainfall in September
Chilmark, MA
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is October (3.07").
The driest months (with the least rainfall) are August and November (1.73").
Average rainfall days in September
Chilmark, MA
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is April (14.5 days).
The month with the least rainy days is February (8.6 days).
Average snowfall in September
Chilmark, MA
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.18").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Chilmark, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Chilmark, MA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Chilmark, MA
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is November (16.7 days).
The month with the least sunshine days is April (13.5 days).
Average UV index in September
Chilmark, MA
- Average UV index in September: 5
The months with the highest UV index are 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
Chilmark, MA
- Average cloud cover in September: 32
The month with the most cloud cover is December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Chilmark, 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).
