Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September sees a slight reduction in average high-temperature, with a shift from a warm 75.2°F (24°C) in August to an agreeable 69.1°F (20.6°C). During September nights, Henderson Harbor witnesses a consistent average temperature of 53.8°F (12.1°C).Humidity
The months with the lowest humidity are April and September, with an average relative humidity of 77%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.9 days and typically collects 1.85" (47mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day in Henderson Harbor, New York, is 12h and 29min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:47 pm EDT.
Sunshine
The average sunshine in September in Henderson Harbor is 9.3h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 3 in September translates into these instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. To guard against the harmful effects of the Sun, minimize exposure during midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Henderson Harbor in September?
What are the least humid months in Henderson Harbor?
What is the average humidity in September in Henderson Harbor?
What is the driest month in Henderson Harbor?
How much does it rain in Henderson Harbor in September?
When it does not snow in Henderson Harbor?
Does it snow in Henderson Harbor in September?
What is the average length of the day in September in Henderson Harbor?
When is the sunrise / sunset in September in Henderson Harbor?
How many hours of sunshine does Henderson Harbor have in September?
How high is the UV index in September in Henderson Harbor?
Average temperature in September
Henderson Harbor, NY
- Average high temperature in September: 69.1°F
The warmest month (with the highest average high temperature) is July (76.1°F).
The month with the lowest average high temperature is January (26.6°F).
- Average low temperature in September: 53.8°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure in September
Henderson Harbor, NY
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Henderson Harbor, NY
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is January (11mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).
Average humidity in September
Henderson Harbor, NY
- Average humidity in September: 77%
The months with the highest relative humidity are January and February (87%).
The months with the lowest relative humidity are April and September (77%).
Average rainfall in September
Henderson Harbor, NY
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is October (3.23").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in September
Henderson Harbor, NY
- Average rainfall days in September: 13.9 days
The month with the highest number of rainy days is October (17.4 days).
The months with the least rainy days are January and February (7 days).
Average snowfall in September
Henderson Harbor, NY
- Average snowfall in September: 0"
The month with the highest snowfall is December (9.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Henderson Harbor, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (19 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Henderson Harbor, NY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The months with the least sunshine are January and February (Average sunshine: 2h and 42min).
Average sunshine days in September
Henderson Harbor, NY
- Average sunshine days in September: 15 days
The month with the most sunshine days is September (15 days).
The months with the least sunshine days are January and February (7.3 days).
Average UV index in September
Henderson Harbor, NY
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Henderson Harbor, NY
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Henderson Harbor, NY
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Henderson Harbor, New York, USA
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