September weather forecastCaldwell, NJ
September
Weather in September
September, the first month of the autumn in Caldwell, is still a warm month, with an average temperature ranging between min 58.1°F (14.5°C) and max 74.7°F (23.7°C).Temperature
Caldwell in September experiences a gentle temperature dip, with average high-temperatures reducing from a moderately hot 82°F (27.8°C) in August to a still warm 74.7°F (23.7°C). Throughout the nights in September, Caldwell experiences an average low-temperature of 58.1°F (14.5°C).Humidity
In September, the average relative humidity in Caldwell, New Jersey, is 76%.Rainfall
In Caldwell, in September, it is raining for 13.5 days, with typically 1.69" (43mm) of accumulated precipitation. In Caldwell, during the entire year, the rain falls for 158 days and collects up to 27.4" (696mm) of precipitation.Snowfall
In Caldwell, snow does not fall in June through October.Daylight
The average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:24 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:40 pm EDT.
Sunshine
In September, the average sunshine in Caldwell is 8.6h.UV index
In Caldwell, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In September, a regular UV index of 4 translates into these guidelines:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Caldwell, NJ
- Average high temperature in September: 74.7°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in September
Caldwell, NJ
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Caldwell, NJ
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Caldwell, NJ
- Average humidity in September: 76%
The months with the highest relative humidity are February and December (79%).
The months with the lowest relative humidity are April and August (73%).
Average rainfall in September
Caldwell, NJ
- Average rainfall in September: 1.69"
The wettest month (with the highest rainfall) is July (3.15").
The driest month (with the least rainfall) is January (1.57").
Average rainfall days in September
Caldwell, NJ
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in September
Caldwell, NJ
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.58").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Caldwell, NJ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Caldwell, NJ
- 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 36min
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
Caldwell, NJ
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (10.7 days).
Average UV index in September
Caldwell, NJ
- 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
Caldwell, NJ
- Average cloud cover in September: 38
The months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Caldwell, NJ
- 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).
