Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September brings a slight decrease in the average high-temperature, shifting from a moderately hot 82.9°F (28.3°C) in August to a still warm 75.4°F (24.1°C). In Demarest, in September, the average low-temperature is a moderate 59.9°F (15.5°C).Humidity
In Demarest, the average relative humidity in September is 73%.Rainfall
September is the month with the least rainfall. Rain falls for 11.6 days and accumulates 1.73" (44mm) of precipitation.Snowfall
May through October are months without snowfall in Demarest.Daylight
In Demarest, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:39 pm EDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 4 in September transforms into this advice:
Take precautions - Protection against sun damage is advised. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Demarest in September?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Demarest have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Demarest have in September?
How high is the UV index in September?
Average temperature in September
Demarest, NJ
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in September: 59.9°F
The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.1°F).
Average pressure in September
Demarest, NJ
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Demarest, NJ
- Average wind speed in September: 6.3mph
The windiest months (with the highest average wind speed) are January and March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in September
Demarest, NJ
- Average humidity in September: 73%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (68%).
Average rainfall in September
Demarest, NJ
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is December (3.46").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in September
Demarest, NJ
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in September
Demarest, NJ
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.07").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Demarest, NJ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.9 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
Demarest, NJ
- Average daylight in September: 12h and 3min
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 4min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Demarest, NJ
- Average sunshine days in September: 16.7 days
The months with the most sunshine days are January and November (18.1 days).
The months with the least sunshine days are April and June (12.7 days).
Average UV index in September
Demarest, 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
Demarest, NJ
- Average cloud cover in September: 37
The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Demarest, 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).
Demarest, New Jersey, USA
Weather forecast for your location
2. Allow the app to use your location