September weather forecastNorthfield, NJ
September
Weather in September
September, the first month of the autumn in Northfield, is still a warm month, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 65.5°F (18.6°C).Temperature
The arrival of September corresponds with a minor reduction in the average high-temperature, down from August's 80.2°F (26.8°C) to a still moderately hot 74.3°F (23.5°C). During September, Northfield's nights hold steady with an average temperature of 65.5°F (18.6°C), barely dropping from the daytime highs.Humidity
In September, the average relative humidity is 77%.Rainfall
In Northfield, during September, the rain falls for 11.6 days and regularly aggregates up to 1.3" (33mm) of precipitation. Throughout the year, there are 140.2 rainfall days, and 18.54" (471mm) of precipitation is accumulated.Snowfall
In Northfield, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:41 pm EDT.
Sunshine
In September, the average sunshine is 9.4h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In September, a regular UV index of 5 translates into these guidelines:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Northfield, NJ
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (40.1°F).
- Average low temperature in September: 65.5°F
The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure in September
Northfield, 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
Northfield, NJ
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is January (11.7mph).
The calmest month (with the lowest average wind speed) is August (8mph).
Average humidity in September
Northfield, NJ
- Average humidity in September: 77%
The months with the highest relative humidity are May and June (80%).
The month with the lowest relative humidity is November (73%).
Average rainfall in September
Northfield, NJ
- Average rainfall in September: 1.3"
The wettest month (with the highest rainfall) is August (2.01").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in September
Northfield, NJ
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in September
Northfield, NJ
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Northfield, NJ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Northfield, 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 24min).
- Average sunshine in September: 9h and 24min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Northfield, NJ
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (13.1 days).
Average UV index in September
Northfield, NJ
- Average UV index in September: 5
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 and December (UV index 2).
Average cloud cover in September
Northfield, NJ
- Average cloud cover in September: 31
The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Northfield, 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).
