September weather forecastKatonah, NY
September
Weather in September
The first month of the autumn, September, is still a warm month in Katonah, New York, with an average temperature fluctuating between 58.1°F (14.5°C) and 73.9°F (23.3°C).Temperature
The onset of September brings a small shift in high-temperatures, falling from a moderately hot 81.1°F (27.3°C) in August to a still warm 73.9°F (23.3°C). An average nighttime temperature of 58.1°F (14.5°C) is witnessed throughout September.Humidity
In September, the average relative humidity is 76%.Rainfall
In Katonah, in September, during 12.2 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, in Katonah, there are 144.2 rainfall days, and 22.32" (567mm) of precipitation is accumulated.Snowfall
In Katonah, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:21 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:37 pm EDT.
Sunshine
In Katonah, the average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September in Katonah is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Katonah, NY
- Average high temperature in September: 73.9°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34.5°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in September
Katonah, 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
Katonah, NY
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
Katonah, NY
- Average humidity in September: 76%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (72%).
Average rainfall in September
Katonah, NY
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is July (2.68").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days in September
Katonah, NY
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in September
Katonah, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.95").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Katonah, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (6.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Katonah, NY
- Average daylight in September: 12h and 30min
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: 8h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Katonah, NY
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is November (20.3 days).
The month with the least sunshine days is June (12.1 days).
Average UV index in September
Katonah, NY
- Average UV index in September: 4
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
Katonah, NY
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Katonah, 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).
