September weather forecastWilliston Park, NY
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Williston Park, New York, with an average temperature fluctuating between 72.7°F (22.6°C) and 64.6°F (18.1°C).Temperature
September sees a slight reduction in average high-temperature, with a shift from a moderately hot 79.5°F (26.4°C) in August to an agreeable 72.7°F (22.6°C). In Williston Park, September is characterized by an average low-temperature of 64.6°F (18.1°C), indicating a minor drop from daytime highs.Humidity
In Williston Park, the average relative humidity in September is 74%.Rainfall
In September, in Williston Park, the rain falls for 13.4 days. Throughout September, 2.6" (66mm) of precipitation is accumulated. In Williston Park, during the entire year, the rain falls for 158.5 days and collects up to 36.38" (924mm) of precipitation.Snowfall
May through September are months without snowfall in Williston Park.Daylight
In September, the average length of the day is 12h and 27min.On the first day of September, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:37 pm EDT.
Sunshine
The average sunshine in September is 9.1h.UV index
In Williston Park, New York, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: An average maximum UV index of 5 in September leads to these recommendations:
Exercise prevention - Precautions against solar damage are endorsed. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Williston Park, NY
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (37.2°F).
- Average low temperature in September: 64.6°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 (28.6°F).
Average pressure in September
Williston Park, 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
Williston Park, NY
- Average wind speed in September: 9.2mph
The windiest month (with the highest average wind speed) is January (12.4mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in September
Williston Park, NY
- Average humidity in September: 74%
The months with the highest relative humidity are May and June (76%).
The month with the lowest relative humidity is November (71%).
Average rainfall in September
Williston Park, NY
- Average rainfall in September: 2.6"
The wettest month (with the highest rainfall) is July (4.13").
The driest month (with the least rainfall) is January (2.17").
Average rainfall days in September
Williston Park, NY
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is January (8 days).
Average snowfall in September
Williston Park, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.85").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Williston Park, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Williston Park, 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
Williston Park, NY
- Average sunshine days in September: 15 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in September
Williston Park, 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
Williston Park, 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
Williston Park, 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).
