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
The beginning of September brings a slight decrease in the average high-temperature, transitioning from a warm 78.6°F (25.9°C) in August to an agreeable 72.5°F (22.5°C). In September, Melville experiences a marginal drop in temperature, with averages of 65.5°F (18.6°C) at night.Humidity
The average relative humidity in September is 74%.Rainfall
In Melville, in September, during 12 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, there are 128.1 rainfall days, and 12.56" (319mm) of precipitation is accumulated.Snowfall
June through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 27min.On the first day of the month, sunrise is at 6:21 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:36 pm EDT.
Sunshine
The average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. To protect against the Sun's most potent rays, avoid direct exposure around midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September in Melville?
When it does not snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September in Melville?
What is the UV index intensity in September?
Average temperature in September
Melville, NY
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in September: 65.5°F
The month with the highest average low temperature is August (71.8°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).
Average pressure in September
Melville, 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
Melville, NY
- Average wind speed in September: 10.1mph
The windiest month (with the highest average wind speed) is January (13.3mph).
The calmest month (with the lowest average wind speed) is July (8.7mph).
Average humidity in September
Melville, 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 (71%).
Average rainfall in September
Melville, NY
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is July (1.73").
The driest month (with the least rainfall) is February (0.59").
Average rainfall days in September
Melville, NY
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is July (14.1 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in September
Melville, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (0.35").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Melville, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 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
Melville, NY
- Average daylight in September: 12h and 3min
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 1min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Melville, NY
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is June (14 days).
Average UV index in September
Melville, 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
Melville, NY
- Average cloud cover in September: 32
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Melville, 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).
Melville, New York, USA
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