September weather forecastDelmont, NJ
September
Weather in September
The first month of the autumn, September, is still a warm month in Delmont, New Jersey, with an average temperature fluctuating between 73.9°F (23.3°C) and 66.2°F (19°C).Temperature
A moderate decline in average high-temperatures is noted in September, moving from 79.9°F (26.6°C) in August to a still moderately hot 73.9°F (23.3°C). Delmont experiences a subtle drop in temperature during the September nights, recording an average of 66.2°F (19°C).Humidity
The average relative humidity in September is 77%.Rainfall
In September, the rain falls for 10.6 days. Throughout September, 0.91" (23mm) of precipitation is accumulated. Throughout the year, there are 130.8 rainfall days, and 13.23" (336mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:43 pm EDT.
Sunshine
In Delmont, the average sunshine in September is 9.5h.UV index
In Delmont, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum high UV index of 5 in September translates into the following recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. 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
Average temperature in September
Delmont, NJ
- Average high temperature in September: 73.9°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 (40.1°F).
- Average low temperature in September: 66.2°F
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).
Average pressure in September
Delmont, NJ
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Delmont, NJ
- Average wind speed in September: 9.5mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (8.1mph).
Average humidity in September
Delmont, NJ
- Average humidity in September: 77%
The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is November (73%).
Average rainfall in September
Delmont, NJ
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is August (1.61").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in September
Delmont, NJ
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is July (15.2 days).
The month with the least rainy days is January (7 days).
Average snowfall in September
Delmont, NJ
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Delmont, NJ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Delmont, NJ
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Delmont, NJ
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (13.4 days).
Average UV index in September
Delmont, NJ
- Average UV index in September: 5
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 and December (UV index 2).
Average cloud cover in September
Delmont, NJ
- Average cloud cover in September: 29
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
Delmont, NJ
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
