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
Transition into September subtly marks a drop in the average high-temperature, moderately moving from a moderately hot 78.8°F (26°C) in August to a pleasant 71.2°F (21.8°C). In September, the temperature in Old Chatham, New York, drops to an average of 51.1°F (10.6°C) at night.Humidity
In September, the average relative humidity in Old Chatham is 79%.Rainfall
In Old Chatham, New York, in September, it is raining for 10.7 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, in Old Chatham, there are 135.1 rainfall days, and 20.39" (518mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Old Chatham, New York, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:27 pm. On the last day of September, in Old Chatham, sunrise is at 6:51 am and sunset at 6:36 pm EDT.
Sunshine
The average sunshine in September is 8.8h.UV index
The average daily maximum UV index in September in Old Chatham is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Old Chatham?
What is the average humidity in September in Old Chatham?
How many days does it rain in September in Old Chatham?
When it does not snow in Old Chatham?
Does it snow in Old Chatham in September?
How many hours of daylight does Old Chatham have in September?
What time are sunrise and sunset in September in Old Chatham?
How long on average sun shines in September in Old Chatham?
What is the UV index intensity in September in Old Chatham?
Average temperature in September
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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
Old Chatham, 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 6min).
- Average sunshine in September: 8h and 5min
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
Old 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
Old 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
Old 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
Old 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).
Old Chatham, New York, USA
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