September weather forecastRock Mill, NJ
September
Weather in September
The first month of the autumn, September, is still a warm month in Rock Mill, New Jersey, with temperature in the range of an average low of 58.1°F (14.5°C) and an average high of 75.7°F (24.3°C).Temperature
The commencement of September indicates a gentle shift in the average high-temperature, receding from August's moderately hot 82.4°F (28°C) to a still warm 75.7°F (24.3°C). The low-temperature average for Rock Mill during September stands at a mild 58.1°F (14.5°C).Humidity
In September, the average relative humidity in Rock Mill is 77%.Rainfall
The month with the least rainfall is September, when the rain falls for 8.5 days and typically collects 0.35" (9mm) of precipitation.Snowfall
In Rock Mill, snow does not fall in June through October.Daylight
The average length of the day in September in Rock Mill is 12h and 27min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:30 pm. On the last day of September, in Rock Mill, sunrise is at 6:55 am and sunset at 6:42 pm EDT.
Sunshine
The average sunshine in September in Rock Mill is 8.6h.UV index
In September, the average daily maximum UV index in Rock Mill is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Ensure safety - Imperative it is to shield skin and eyes from damage. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rock Mill, NJ
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (36.5°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in September
Rock Mill, NJ
- Average pressure in September: 30.05"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
Rock Mill, NJ
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
Rock Mill, NJ
- Average humidity in September: 77%
The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (74%).
Average rainfall in September
Rock Mill, NJ
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is July (1.18").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in September
Rock Mill, NJ
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is July (12.9 days).
The month with the least rainy days is November (5.5 days).
Average snowfall in September
Rock Mill, NJ
- Average snowfall in September: 0"
The month with the highest snowfall is March (0.75").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Rock Mill, NJ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Rock Mill, NJ
- Average daylight in September: 12h and 24min
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 18min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Rock Mill, NJ
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is November (22.7 days).
The month with the least sunshine days is July (13.6 days).
Average UV index in September
Rock Mill, NJ
- 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, March, November and December (UV index 2).
Average cloud cover in September
Rock Mill, NJ
- Average cloud cover in September: 38
The months with the most cloud cover are February and December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in September
Rock Mill, 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).
