September weather forecastEast Hampton, NY
September
Weather in September
September signals the onset of fall in East Hampton, marked by temperatures edging down from the summer highs. The chill of the morning and night acknowledges the coming autumn, creating an invigorating atmosphere. The sea temperature reduces to 68°F (20°C), noticeable for those indulging in water activities. Daylight hours contract while rainfall comes down to 2.09" (53mm), considerably lesser than the preceding months. Despite the weather transition, East Hampton remains a sight to behold under the setting sun of September.Temperature
September's commencement in East Hampton is accompanied by an average high-temperature of an agreeable 70.3°F (21.3°C), diverging marginally from August's 75.4°F (24.1°C). East Hampton observes a slightly reduced average nighttime temperature of 65.1°F (18.4°C) during September.Humidity
In September, the average relative humidity in East Hampton is 76%.Rainfall
September is the month with the least rainfall in East Hampton. Rain falls for 12.6 days and accumulates 2.09" (53mm) of precipitation.Snowfall
In East Hampton, snow does not fall in June through October.Ocean temperature
In East Hampton, the average seawater temperature in September is 68°F (20°C).Note: Most people find it challenging to enjoy swimming in water that is 68°F (20°C). As water temperature falls below 69.8°F (21°C), controlling breathing grows increasingly difficult.
Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:16 am and sunset at 7:20 pm. On the last day of September, in East Hampton, sunrise is at 6:45 am and sunset at 6:31 pm EDT.
Sunshine
In East Hampton, the average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In September, an average UV index of 5 transforms into the following instructions:
Heed the precautions - It is counselled to guard against solar damage. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
East Hampton, NY
- Average high temperature in September: 70.3°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in September: 65.1°F
The month with the highest average low temperature is August (71.2°F).
The coldest month (with the lowest average low temperature) is January (31.1°F).
Average pressure in September
East Hampton, NY
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
East Hampton, NY
- Average wind speed in September: 12.7mph
The windiest month (with the highest average wind speed) is January (16.4mph).
The calmest month (with the lowest average wind speed) is July (10.8mph).
Average humidity in September
East Hampton, NY
- Average humidity in September: 76%
The months with the highest relative humidity are May and June (82%).
The month with the lowest relative humidity is November (72%).
Average rainfall in September
East Hampton, NY
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is December (3.54").
The driest month (with the least rainfall) is September (2.09").
Average rainfall days in September
East Hampton, NY
- Average rainfall days in September: 12.6 days
The months with the highest number of rainy days are July and August (15.5 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in September
East Hampton, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.97").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
East Hampton, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.9 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in September
East Hampton, NY
- Average sea temperature in September: 68°F
The best month for swimming (with the highest average sea temperature) is August (72°F).
The coldest months (with the lowest average sea temperature) are February and March (41°F).
Average daylight in September /
Average sunshine in September
East Hampton, NY
- 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 18min).
- Average sunshine in September: 8h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
East Hampton, NY
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (18.4 days).
The months with the least sunshine days are July and August (13.3 days).
Average UV index in September
East Hampton, NY
- Average UV index in September: 5
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 and December (UV index 2).
Average cloud cover in September
East Hampton, NY
- Average cloud cover in September: 32
The month with the most cloud cover is December (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
East Hampton, NY
- 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).
