September weather forecastMattituck, NY
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Mattituck, New York, with an average temperature fluctuating between 70.9°F (21.6°C) and 65.7°F (18.7°C).Temperature
The arrival of September records an average high-temperature of an agreeable 70.9°F (21.6°C), closely related to the 75.7°F (24.3°C) observed in August. September nights witness a mild cool down to an average low of 65.7°F (18.7°C).Humidity
In September, the average relative humidity in Mattituck, New York, is 76%.Rainfall
September is the month with the least rainfall. Rain falls for 11.7 days and accumulates 2.01" (51mm) of precipitation.Snowfall
In Mattituck, snow does not fall in April, June through November.Daylight
In September, the average length of the day in Mattituck is 12h and 28min.On the first day of September, sunrise is at 6:17 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:33 pm EDT.
Sunshine
The average sunshine in September is 9h.UV index
The average daily maximum UV index in September in Mattituck is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, a daily UV index of 5 turns into the following recommendations:
Be vigilant - Preventing sunburn is recommended. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mattituck, NY
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (75.9°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in September: 65.7°F
The months with the highest average low temperature are July and August (71.2°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).
Average pressure in September
Mattituck, NY
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Mattituck, NY
- Average wind speed in September: 12.3mph
The windiest month (with the highest average wind speed) is January (15.9mph).
The calmest month (with the lowest average wind speed) is July (10.5mph).
Average humidity in September
Mattituck, 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
Mattituck, NY
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is December (4.06").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in September
Mattituck, NY
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is January (9.7 days).
Average snowfall in September
Mattituck, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.69").
The months with the least snowfall are April, June, July, August, September, October and November (0").
Average snowfall days in September
Mattituck, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Mattituck, 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: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).
Average sunshine days in September
Mattituck, NY
- Average sunshine days in September: 17 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is February (12.3 days).
Average UV index in September
Mattituck, 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
Mattituck, 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
Mattituck, 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).
