September weather forecastLawrenceville, NJ
September
Weather in September
The first month of the autumn, September, is still a warm month in Lawrenceville, New Jersey, with temperature in the range of an average high of 76.1°F (24.5°C) and an average low of 59°F (15°C).Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from a warm 82.9°F (28.3°C) in August to a still moderately hot 76.1°F (24.5°C). During the month of September, Lawrenceville anticipates a mean low-temperature of 59°F (15°C).Humidity
In September, the average relative humidity in Lawrenceville is 76%.Rainfall
In Lawrenceville, in September, during 11.6 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, there are 138.1 rainfall days, and 16.5" (419mm) of precipitation is accumulated.Snowfall
June through October are months without snowfall.Daylight
In Lawrenceville, the average length of the day in September 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, sunrise is at 6:55 am and sunset at 6:42 pm EDT.
Sunshine
In Lawrenceville, the average sunshine in September is 8.8h.UV index
In September, the average daily maximum UV index in Lawrenceville is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: An average maximum UV index of 4 in September leads to these recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. 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
Lawrenceville, NJ
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in September: 59°F
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in September
Lawrenceville, 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
Lawrenceville, 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
Lawrenceville, NJ
- Average humidity in September: 76%
The months with the highest relative humidity are February, October and December (78%).
The months with the lowest relative humidity are April and July (73%).
Average rainfall in September
Lawrenceville, NJ
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is July (2.24").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in September
Lawrenceville, NJ
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is November (7.2 days).
Average snowfall in September
Lawrenceville, NJ
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.71").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Lawrenceville, NJ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lawrenceville, 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 24min).
- Average sunshine in September: 8h and 48min
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 48min).
Average sunshine days in September
Lawrenceville, NJ
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is July (12.3 days).
Average UV index in September
Lawrenceville, 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
Lawrenceville, NJ
- Average cloud cover in September: 37
The months with the most cloud cover are February and December (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Lawrenceville, 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).
