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
The advent of September brings a slight shift in average high-temperature, moving from 81.9°F (27.7°C) in August to a still moderately hot 75°F (23.9°C). Chatham experiences an average nighttime temperature of 58.8°F (14.9°C) in the month of September.Humidity
February, May, September, October and December, with an average relative humidity of 79%, are the most humid months.Rainfall
January, September and November are months with the least rain in Chatham when the rain falls for 10.8 days and typically aggregates up to 0.87" (22mm) of rain.Snowfall
June through October are months without snowfall in Chatham.Daylight
In Chatham, the average length of the day in September is 12h and 26min.On the first day of September in Chatham, sunrise is at 6:31 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:46 pm EDT.
Sunshine
The average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September in Chatham is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 4 during September leads to these advisories:
Guard yourself - An obligation to protect skin and eyes from harm exists. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
What is the average September temperature in Chatham?
What are the most humid months in Chatham?
What is the average humidity in September in Chatham?
What is the driest month in Chatham?
How much does it rain in Chatham in September?
When it does not snow in Chatham?
How many hours of daylight does Chatham have in September?
When is the sunrise / sunset in September in Chatham?
How long on average sun shines in September in Chatham?
What is the UV index reading in September in Chatham?
Average temperature in September
Chatham, PA
- Average high temperature in September: 75°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in September: 58.8°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).
Average pressure in September
Chatham, PA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Chatham, PA
- Average wind speed in September: 5.8mph
The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Chatham, PA
- Average humidity in September: 79%
The months with the highest relative humidity are February, May, September, October and December (79%).
The months with the lowest relative humidity are March and April (75%).
Average rainfall in September
Chatham, PA
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is August (1.93").
The driest months (with the least rainfall) are January, September and November (0.87").
Average rainfall days in September
Chatham, PA
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in September
Chatham, PA
- Average snowfall in September: 0"
The month with the highest snowfall is March (1.26").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Chatham, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.1 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, PA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in September
Chatham, PA
- Average sunshine days in September: 17.6 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in September
Chatham, PA
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Chatham, PA
- Average cloud cover in September: 37
The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Chatham, PA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Chatham, Pennsylvania, USA
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