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
The advent of September brings a slight shift in average high-temperature, moving from a warm 80.6°F (27°C) in August to an agreeable 72.5°F (22.5°C). Wilmington's nighttime temperature in September falls to an average of 56.7°F (13.7°C).Humidity
In Wilmington, the average relative humidity in September is 75%.Rainfall
September is the month with the least rainfall. Rain falls for 10.3 days and accumulates 1.22" (31mm) of precipitation.Snowfall
June through September are months without snowfall in Wilmington.Daylight
In September, the average length of the day in Wilmington is 12h and 29min.On the first day of the month, sunrise is at 6:10 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
The average sunshine in September is 8.4h.UV index
In September, the average daily maximum UV index in Wilmington is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: In September, a daily UV index of 4 turns into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
What are the temperatures in Wilmington in September?
What is the average humidity in September in Wilmington?
What is the driest month in Wilmington?
How much does it rain in Wilmington in September?
When it does not snow in Wilmington?
Does it snow in Wilmington in September?
How many hours of daylight does Wilmington have in September?
When is the sunrise / sunset in September in Wilmington?
How many hours of sunshine does Wilmington have in September?
How high is the UV index in September in Wilmington?
Average temperature in September
Wilmington, MA
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.1°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 (21.6°F).
Average pressure in September
Wilmington, 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
Wilmington, MA
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in September
Wilmington, MA
- Average humidity in September: 75%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (69%).
Average rainfall in September
Wilmington, MA
- Average rainfall in September: 1.22"
The wettest month (with the highest rainfall) is December (2.87").
The driest month (with the least rainfall) is September (1.22").
Average rainfall days in September
Wilmington, MA
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is January (7.4 days).
Average snowfall in September
Wilmington, MA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.96").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Wilmington, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Wilmington, 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 2min
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 36min).
Average sunshine days in September
Wilmington, MA
- Average sunshine days in September: 17.6 days
The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is April (13.3 days).
Average UV index in September
Wilmington, 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
Wilmington, MA
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Wilmington, 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).
Wilmington, Massachusetts, USA
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