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 76.5°F (24.7°C) in August to a pleasant 70.3°F (21.3°C). Throughout September, the average low-temperature dips to a mild 57.4°F (14.1°C).Humidity
August and September, with an average relative humidity of 76%, are the least humid months.Rainfall
In September, the rain falls for 14.8 days. Throughout September, 1.77" (45mm) of precipitation is accumulated. In Clarkson, during the entire year, the rain falls for 163.5 days and collects up to 24.61" (625mm) of precipitation.Snowfall
In Clarkson, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:46 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:54 pm EDT.
Sunshine
In Clarkson, the average sunshine in September is 9.3h.UV index
In Clarkson, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Clarkson in September?
What is the least humid month?
What is the average humidity in September?
How much does it rain in Clarkson in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Clarkson have in September?
What is the UV index reading in September?
Average temperature in September
Clarkson, NY
- Average high temperature in September: 70.3°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 (29.7°F).
- Average low temperature in September: 57.4°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure in September
Clarkson, NY
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Clarkson, NY
- Average wind speed in September: 8.4mph
The windiest month (with the highest average wind speed) is January (12.4mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in September
Clarkson, NY
- Average humidity in September: 76%
The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are August and September (76%).
Average rainfall in September
Clarkson, NY
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is January (1.46").
Average rainfall days in September
Clarkson, NY
- Average rainfall days in September: 14.8 days
The months with the highest number of rainy days are August and October (17.3 days).
The month with the least rainy days is February (7.1 days).
Average snowfall in September
Clarkson, NY
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Clarkson, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (16.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Clarkson, NY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and February (Average sunshine: 2h and 42min).
Average sunshine days in September
Clarkson, NY
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is September (13.4 days).
The month with the least sunshine days is January (6.9 days).
Average UV index in September
Clarkson, NY
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Clarkson, NY
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in September
Clarkson, NY
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Clarkson, New York, USA
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