September weather forecastMontauk, NY
September
Weather in September
September marks the departure of the peak summer season, with temperatures falling to a high of 69.6°F (20.9°C) from August. Despite this drop, the weather in Montauk remains favorable for outdoor activities. The decline in temperature signifies the start of autumn, with the environment making a gradual shift. September maintains the balance between the vibrant summer experience and the calm that autumn introduces, marking this month with memorable sunsets and resisting cloud cover.Temperature
September's arrival registers an average high-temperature of a pleasant 69.6°F (20.9°C), closely aligning with the temperature of the previous month. Throughout September, Montauk records a steady low-temperature average of 64.9°F (18.3°C), a minor decrease from its daytime counterpart.Humidity
The average relative humidity in September is 77%.Rainfall
September is the month with the least rainfall. Rain falls for 10.7 days and accumulates 1.77" (45mm) of precipitation.Snowfall
In Montauk, snow does not fall in May through November.Ocean temperature
In Montauk, in September, the average water temperature is 67.6°F (19.8°C).Note: Swimming in 67.6°F (19.8°C) does not offer a pleasant experience for most individuals. The act of controlling one's breathing becomes progressively difficult as the water temperature goes under 69.8°F (21°C).
Daylight
In Montauk, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:19 pm. On the last day of September, sunrise is at 6:44 am and sunset at 6:30 pm EDT.
Sunshine
In September, the average sunshine in Montauk is 8.9h.UV index
In Montauk, New York, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum high UV index of 5 in September translates into the following recommendations:
Take necessary precautions - Defending against sun damage is advocated. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Montauk, NY
- Average high temperature in September: 69.6°F
The warmest month (with the highest average high temperature) is August (74.8°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in September: 64.9°F
The month with the highest average low temperature is August (70.9°F).
The coldest month (with the lowest average low temperature) is January (31.1°F).
Average pressure in September
Montauk, 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
Montauk, NY
- Average wind speed in September: 12.9mph
The windiest month (with the highest average wind speed) is January (16.7mph).
The calmest month (with the lowest average wind speed) is July (11.1mph).
Average humidity in September
Montauk, NY
- Average humidity in September: 77%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is November (73%).
Average rainfall in September
Montauk, NY
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is December (4.02").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in September
Montauk, NY
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is January (9.9 days).
Average snowfall in September
Montauk, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.24").
The months with the least snowfall are May, June, July, August, September, October and November (0").
Average snowfall days in September
Montauk, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Montauk, NY
- Average sea temperature in September: 67.6°F
The best month for swimming (with the highest average sea temperature) is August (70.3°F).
The coldest month (with the lowest average sea temperature) is February (37.9°F).
Average daylight in September /
Average sunshine in September
Montauk, 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 42min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).
Average sunshine days in September
Montauk, NY
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is September (17.7 days).
The month with the least sunshine days is February (12.4 days).
Average UV index in September
Montauk, 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
Montauk, NY
- Average cloud cover in September: 32
The month with the most cloud cover is December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Montauk, 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).
