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
A moderate decline in average high-temperatures is noted in September, moving from a warm 76.3°F (24.6°C) in August to a pleasant 68.9°F (20.5°C). In the month of September, the average low-temperature usually rests at a chilly 49.8°F (9.9°C).Humidity
The average relative humidity in September is 81%.Rainfall
The months with the least rainfall are March and September Rain falls for 13.4 days and accumulates 2.6" (66mm) of rain.Snowfall
In Charlemont, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:17 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:34 pm EDT.
Sunshine
In September, the average sunshine is 8.1h.UV index
The average daily maximum UV index in September in Charlemont is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Ensure safety - Recommendations to avert sunburn are presented. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | 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?
Does it snow in September?
How many hours of daylight does Charlemont have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Charlemont have in September?
What is the UV index reading in September in Charlemont?
Average temperature in September
Charlemont, MA
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in September: 49.8°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).
Average pressure in September
Charlemont, MA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Charlemont, MA
- Average wind speed in September: 5.7mph
The windiest months (with the highest average wind speed) are January and February (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
Charlemont, MA
- Average humidity in September: 81%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Charlemont, MA
- Average rainfall in September: 2.6"
The wettest month (with the highest rainfall) is October (3.58").
The driest months (with the least rainfall) are March and September (2.6").
Average rainfall days in September
Charlemont, MA
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is January (9.3 days).
Average snowfall in September
Charlemont, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (9.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Charlemont, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Charlemont, MA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in September
Charlemont, MA
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is February (10.2 days).
Average UV index in September
Charlemont, MA
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in September
Charlemont, MA
- Average cloud cover in September: 42
The month with the most cloud cover is February (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 39).
Average visibility in September
Charlemont, MA
- Average visibility in September: 5mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).
Charlemont, Massachusetts, USA
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