September weather forecastChatham, NY
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Chatham, New York, with an average temperature ranging between min 51.1°F (10.6°C) and max 71.2°F (21.8°C).Temperature
A mild shift in the average high-temperature occurs in September, reducing from a warm 78.8°F (26°C) in August to an agreeable 71.2°F (21.8°C). In the month of September, the average temperature in Chatham, New York, dips to a cool 51.1°F (10.6°C) during the night.Humidity
In September, the average relative humidity in Chatham is 79%.Rainfall
In Chatham, during September, the rain falls for 10.7 days and regularly aggregates up to 1.57" (40mm) of precipitation. In Chatham, during the entire year, the rain falls for 135.1 days and collects up to 20.39" (518mm) of precipitation.Snowfall
June through September are months without snowfall in Chatham.Daylight
In Chatham, the average length of the day in September is 12h and 28min.On the first day of September in Chatham, sunrise is at 6:20 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:37 pm EDT.
Sunshine
In Chatham, New York, the average sunshine in September is 8.8h.UV index
In Chatham, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chatham, NY
- Average high temperature in September: 71.2°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (29.1°F).
- Average low temperature in September: 51.1°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in September
Chatham, NY
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Chatham, NY
- Average wind speed in September: 5.5mph
The windiest months (with the highest average wind speed) are January and March (8.2mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Chatham, NY
- Average humidity in September: 79%
The months with the highest relative humidity are February and December (83%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Chatham, NY
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is July (2.4").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in September
Chatham, NY
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in September
Chatham, NY
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.9").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Chatham, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Chatham, NY
- Average daylight in September: 12h and 30min
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 6min).
- Average sunshine in September: 8h and 48min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in September
Chatham, NY
- Average sunshine days in September: 16.7 days
The month with the most sunshine days is January (20 days).
The month with the least sunshine days is June (12.5 days).
Average UV index in September
Chatham, NY
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Chatham, NY
- Average cloud cover in September: 38
The month with the most cloud cover is February (Cloud cover 58).
The months with the least cloud cover are July and August (Cloud cover 35).
Average visibility in September
Chatham, NY
- Average visibility in September: 5mi
The months with the highest visibility are January, April, November and December (6mi).
The months with the lowest visibility are February, March, May, June, July, August, September and October (5mi).
