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, Chartley's average high-temperature slightly adjusts, moderately receding from August's moderately hot 80.4°F (26.9°C) to an agreeable 72.9°F (22.7°C). Chartley's nighttime temperature in September falls to an average of 56.1°F (13.4°C).Humidity
The months with the highest humidity are February, June, September and October, with an average relative humidity of 78%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.5 days and typically collects 1.34" (34mm) of precipitation.Snowfall
June through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:11 am and sunset at 7:18 pm. On the last day of September, sunrise is at 6:41 am and sunset at 6:27 pm EDT.
Sunshine
In September, the average sunshine is 8.4h.UV index
In Chartley, Massachusetts, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index of 4 during September translates into the following directions:
Ensure safety - Recommendations to avert sunburn are presented. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What are the most humid months?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Chartley have in September?
How high is the UV index in September?
Average temperature in September
Chartley, 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 (34.3°F).
- Average low temperature in September: 56.1°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in September
Chartley, 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 (29.93"Hg).
Average wind speed in September
Chartley, MA
- Average wind speed in September: 6.7mph
The windiest months (with the highest average wind speed) are February and March (9.3mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in September
Chartley, MA
- Average humidity in September: 78%
The months with the highest relative humidity are February, June, September and October (78%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Chartley, MA
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.34").
Average rainfall days in September
Chartley, MA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in September
Chartley, MA
- Average snowfall in September: 0"
The month with the highest snowfall is March (4.06").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Chartley, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.8 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
Chartley, 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 12min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Chartley, MA
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is April (12.8 days).
Average UV index in September
Chartley, 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
Chartley, MA
- Average cloud cover in September: 38
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Chartley, MA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are August and September (5mi).
Chartley, Massachusetts, USA
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