September weather forecastLong Island, VA
September
Weather in September
September, the first month of the autumn in Long Island, is still a warm month, with an average temperature ranging between min 59.9°F (15.5°C) and max 80.1°F (26.7°C).Temperature
With the onset of September, the average high-temperature subtly recedes from August's hot 86.7°F (30.4°C) to a moderately hot 80.1°F (26.7°C). Long Island reports an average nighttime low-temperature of 59.9°F (15.5°C) in September.Humidity
The average relative humidity in September is 75%.Rainfall
September is the month with the least rainfall. Rain falls for 12.7 days and accumulates 1.73" (44mm) of precipitation.Snowfall
In Long Island, snow does not fall in May through September.Daylight
In Long Island, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:47 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:11 am and sunset at 7:00 pm EDT.
Sunshine
In September, the average sunshine is 8.7h.UV index
In Long Island, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 5 during September leads to these advisories:
Undertake precautions - It is suggested to shield oneself from sunburn. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Long Island, VA
- Average high temperature in September: 80.1°F
The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (43.5°F).
- Average low temperature in September: 59.9°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (28.6°F).
Average pressure in September
Long Island, VA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Long Island, VA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Long Island, VA
- Average humidity in September: 75%
The months with the highest relative humidity are May and December (76%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
Long Island, VA
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in September
Long Island, VA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in September
Long Island, VA
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Long Island, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Long Island, VA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Long Island, VA
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (11 days).
Average UV index in September
Long Island, VA
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Long Island, VA
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 43).
The months with the least cloud cover are June and July (Cloud cover 30).
Average visibility in September
Long Island, VA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
