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 brings a slight decrease in the average high-temperature, shifting from a warm 74.3°F (23.5°C) in August to a comfortable 67.8°F (19.9°C). Sundown experiences an average low-temperature of 48.2°F (9°C) in the month of September.Humidity
In Sundown, the average relative humidity in September is 83%.Rainfall
In September, the rain falls for 13.7 days. Throughout September, 2.83" (72mm) of precipitation is accumulated. Throughout the year, there are 157.3 rainfall days, and 37.91" (963mm) of precipitation is accumulated.Snowfall
In Sundown, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:24 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:40 pm EDT.
Sunshine
The average sunshine in September is 7.2h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Ensure safety - Recommendations to avert sunburn are presented. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September in Sundown?
How many days does it rain in September?
When it does not snow?
Does it snow in Sundown in September?
How many hours of daylight does Sundown have in September?
What time are sunrise and sunset in September in Sundown?
How many hours of sunshine does Sundown have in September?
What is the UV index reading in September?
Average temperature in September
Sundown, NY
- Average high temperature in September: 67.8°F
The warmest month (with the highest average high temperature) is July (77.2°F).
The month with the lowest average high temperature is January (26.4°F).
- Average low temperature in September: 48.2°F
The month with the highest average low temperature is July (56.5°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in September
Sundown, NY
- Average pressure in September: 30.06"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
Sundown, NY
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are January and February (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Sundown, NY
- Average humidity in September: 83%
The months with the highest relative humidity are February and December (88%).
The month with the lowest relative humidity is July (80%).
Average rainfall in September
Sundown, NY
- Average rainfall in September: 2.83"
The wettest month (with the highest rainfall) is July (4.02").
The driest month (with the least rainfall) is February (2.32").
Average rainfall days in September
Sundown, NY
- Average rainfall days in September: 13.7 days
The month with the highest number of rainy days is May (19.3 days).
The months with the least rainy days are January and February (6.3 days).
Average snowfall in September
Sundown, NY
- Average snowfall in September: 0"
The month with the highest snowfall is December (10.91").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Sundown, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (17 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sundown, NY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 7h and 1min
The month with the most sunshine is July (Average sunshine: 8h and 54min).
The month with the least sunshine is February (Average sunshine: 2h and 48min).
Average sunshine days in September
Sundown, NY
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is September (14.2 days).
The month with the least sunshine days is February (8.1 days).
Average UV index in September
Sundown, NY
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Sundown, NY
- Average cloud cover in September: 53
The month with the most cloud cover is February (Cloud cover 74).
The month with the least cloud cover is July (Cloud cover 48).
Average visibility in September
Sundown, NY
- Average visibility in September: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
Sundown, New York, USA
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