September weather forecastSag Harbor, NY
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Sag Harbor, New York, with an average temperature fluctuating between 70.7°F (21.5°C) and 65.1°F (18.4°C).Temperature
Transitioning into September, Sag Harbor experiences an average high-temperature of a pleasant 70.7°F (21.5°C), marking a minor shift from the preceding month. Sag Harbor, during the nights of September, averages a temperature close to its daytime high, at an enjoyable 65.1°F (18.4°C).Humidity
In Sag Harbor, New York, the average relative humidity in September is 76%.Rainfall
September is the month with the least rainfall. Rain falls for 12.6 days and accumulates 2.17" (55mm) of precipitation.Snowfall
In Sag Harbor, New York, snow does not fall in April through October.Ocean temperature
In Sag Harbor, in September, the average water temperature is 68.9°F (20.5°C).Note: Most people do not enjoy swimming in water that is 68.9°F (20.5°C). Breathing becomes increasingly challenging as the water temperature dips under 69.8°F (21°C).
Daylight
In Sag Harbor, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:16 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:32 pm EDT.
Sunshine
In September, the average sunshine is 8.8h.UV index
In Sag Harbor, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 5 translates into these guidelines:
Act with care - Obligation to protect against skin and eye damage is highlighted. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sag Harbor, NY
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is August (75.9°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 (31.3°F).
Average pressure in September
Sag Harbor, 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
Sag Harbor, NY
- Average wind speed in September: 12.4mph
The windiest month (with the highest average wind speed) is January (16mph).
The calmest month (with the lowest average wind speed) is July (10.4mph).
Average humidity in September
Sag Harbor, NY
- Average humidity in September: 76%
The months with the highest relative humidity are May and June (81%).
The month with the lowest relative humidity is November (72%).
Average rainfall in September
Sag Harbor, NY
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is December (3.82").
The driest month (with the least rainfall) is September (2.17").
Average rainfall days in September
Sag Harbor, NY
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in September
Sag Harbor, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.36").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Sag Harbor, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Sag Harbor, NY
- Average sea temperature in September: 68.9°F
The best month for swimming (with the highest average sea temperature) is August (73.3°F).
The coldest month (with the lowest average sea temperature) is February (39.8°F).
Average daylight in September /
Average sunshine in September
Sag Harbor, 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 48min
The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
Sag Harbor, NY
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is February (12.8 days).
Average UV index in September
Sag Harbor, 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
Sag Harbor, NY
- Average cloud cover in September: 33
The month with the most cloud cover is December (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Sag Harbor, 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).
