September weather forecastThiells, NY
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Thiells, New York, with an average temperature varying between 57°F (13.9°C) and 75°F (23.9°C).Temperature
The onset of September aligns with a soft reduction in the average high-temperature, gently falling from a moderately hot 82.6°F (28.1°C) in August to a still warm 75°F (23.9°C). September nights observe an average temperature dip to a moderate 57°F (13.9°C).Humidity
In Thiells, the average relative humidity in September is 76%.Rainfall
September is the month with the least rainfall. Rain falls for 12.4 days and accumulates 1.89" (48mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:39 pm EDT.
Sunshine
The average sunshine in September is 8.8h.UV index
In Thiells, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Act with care - The need to guard against sun damage is communicated. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Thiells, NY
- Average high temperature in September: 75°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in September: 57°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in September
Thiells, 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
Thiells, NY
- Average wind speed in September: 5.4mph
The windiest months (with the highest average wind speed) are January and March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Thiells, NY
- Average humidity in September: 76%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (72%).
Average rainfall in September
Thiells, NY
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is July (3.23").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in September
Thiells, NY
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in September
Thiells, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.46").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Thiells, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (6.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Thiells, 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 48min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Thiells, NY
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (11.5 days).
Average UV index in September
Thiells, 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
Thiells, NY
- Average cloud cover in September: 37
The months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Thiells, NY
- Average visibility in September: 6mi
The months with the highest visibility are January, March, April, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are February and May (5mi).
