September weather forecastHewlett Harbor, NY
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Hewlett Harbor, New York, with an average temperature varying between 64.2°F (17.9°C) and 73.2°F (22.9°C).Temperature
In Hewlett Harbor, entering September brings a subtle temperature decrement, reducing from August's moderately hot 79.9°F (26.6°C) to a pleasant 73.2°F (22.9°C). The month of September in Hewlett Harbor shows a minor drop from daytime temperatures, generally recording a low average of 64.2°F (17.9°C).Humidity
The average relative humidity in September is 74%.Rainfall
In September, in Hewlett Harbor, the rain falls for 12.4 days. Throughout September, 1.38" (35mm) of precipitation is accumulated. In Hewlett Harbor, during the entire year, the rain falls for 135.3 days and collects up to 18.62" (473mm) of precipitation.Snowfall
April through September are months without snowfall.Ocean temperature
In Hewlett Harbor, in September, the average water temperature is 70.2°F (21.2°C).Note: In water of 70.2°F (21.2°C), the majority of people do not enjoy swimming. Breathing becomes increasingly hard to manage as the temperature drops from 69.8°F (21°C) to 59°F (15°C).
Daylight
In September, the average length of the day in Hewlett Harbor is 12h and 27min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:38 pm EDT.
Sunshine
The average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September in Hewlett Harbor, New York, is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: In September, an average UV index of 5 transforms into the following instructions:
Take necessary precautions - Defending against sun damage is advocated. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hewlett Harbor, NY
- Average high temperature in September: 73.2°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (37°F).
- Average low temperature in September: 64.2°F
The month with the highest average low temperature is August (71.1°F).
The coldest month (with the lowest average low temperature) is January (28.2°F).
Average pressure in September
Hewlett Harbor, NY
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Hewlett Harbor, NY
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is January (12.4mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in September
Hewlett Harbor, NY
- Average humidity in September: 74%
The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is November (72%).
Average rainfall in September
Hewlett Harbor, NY
- Average rainfall in September: 1.38"
The wettest months (with the highest rainfall) are July and August (2.32").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in September
Hewlett Harbor, NY
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in September
Hewlett Harbor, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.02").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in September
Hewlett Harbor, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in September
Hewlett Harbor, NY
- Average sea temperature in September: 70.1°F
The best month for swimming (with the highest average sea temperature) is August (74.1°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).
Average daylight in September /
Average sunshine in September
Hewlett Harbor, NY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Hewlett Harbor, NY
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is July (13.6 days).
Average UV index in September
Hewlett 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, November and December (UV index 2).
Average cloud cover in September
Hewlett Harbor, NY
- Average cloud cover in September: 32
The months with the most cloud cover are February and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Hewlett 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).
