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
The commencement of September indicates a gentle shift in the average high-temperature, receding from August's 84.9°F (29.4°C) to a still moderately hot 78.3°F (25.7°C). Stoney Brook encounters an average low-temperature of 61°F (16.1°C) during September nights.Humidity
In Stoney Brook, the average relative humidity in September is 73%.Rainfall
In Stoney Brook, in September, during 12.9 rainfall days, 2.44" (62mm) of precipitation is typically accumulated. In Stoney Brook, during the entire year, the rain falls for 161.3 days and collects up to 33.19" (843mm) of precipitation.Snowfall
May through October are months without snowfall in Stoney Brook.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:38 pm. On the last day of September, in Stoney Brook, Maryland, sunrise is at 7:04 am and sunset at 6:52 pm EDT.
Sunshine
In Stoney Brook, the average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September in Stoney Brook, Maryland, is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: During September, 5 as the daily maximum UV index converts into the following advice:
Undertake precautions - It is suggested to shield oneself from sunburn. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Frequently asked questions
What is the usual temperature for Stoney Brook in September?
What is the average humidity in September in Stoney Brook?
How many days does it rain in September in Stoney Brook?
When it does not snow in Stoney Brook?
How many hours of daylight does Stoney Brook have in September?
When is the sunrise / sunset in September in Stoney Brook?
How long on average sun shines in September in Stoney Brook?
What is the UV index intensity in September in Stoney Brook?
Average temperature in September
Stoney Brook, MD
- Average high temperature in September: 78.3°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in September: 61°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).
Average pressure in September
Stoney Brook, MD
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Stoney Brook, MD
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in September
Stoney Brook, MD
- Average humidity in September: 73%
The months with the highest relative humidity are May, October and December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Stoney Brook, MD
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.17").
Average rainfall days in September
Stoney Brook, MD
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (8.8 days).
Average snowfall in September
Stoney Brook, MD
- Average snowfall in September: 0"
The months with the highest snowfall are January and March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Stoney Brook, MD
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (5.1 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
Stoney Brook, MD
- Average daylight in September: 12h and 2min
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: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Stoney Brook, MD
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is November (19.5 days).
The months with the least sunshine days are May and July (11 days).
Average UV index in September
Stoney Brook, MD
- 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, November and December (UV index 2).
Average cloud cover in September
Stoney Brook, MD
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Stoney Brook, MD
- 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).
Stoney Brook, Maryland, USA
Weather forecast for your location
2. Allow the app to use your location
