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 average high-temperature slightly decreases in September, shifting from a warm 82.8°F (28.2°C) in August to a still moderately hot 76.3°F (24.6°C). The mean low-temperature during September nights is a refreshing 60.4°F (15.8°C).Humidity
In September, the average relative humidity is 76%.Rainfall
In Long Green, in September, during 8 rainfall days, 0.51" (13mm) of precipitation is typically accumulated. Throughout the year, there are 102.3 rainfall days, and 9.25" (235mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September in Long Green is 12h and 26min.On the first day of September, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:49 pm EDT.
Sunshine
The average sunshine in September is 8.9h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September in Long Green?
When are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Long Green, MD
- Average high temperature in September: 76.3°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 (37.9°F).
- Average low temperature in September: 60.4°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).
Average pressure in September
Long Green, 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 (29.94"Hg).
Average wind speed in September
Long Green, MD
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Long Green, MD
- Average humidity in September: 76%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in September
Long Green, MD
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is August (1.46").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
Long Green, MD
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is July (12.6 days).
The month with the least rainy days is January (5.2 days).
Average snowfall in September
Long Green, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.55").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Long Green, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 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
Long Green, 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 24min).
- 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 February (Average sunshine: 4h and 54min).
Average sunshine days in September
Long Green, MD
- Average sunshine days in September: 19.8 days
The month with the most sunshine days is November (22.9 days).
The month with the least sunshine days is July (15.2 days).
Average UV index in September
Long Green, 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, February, November and December (UV index 2).
Average cloud cover in September
Long Green, MD
- Average cloud cover in September: 36
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Long Green, MD
- 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).
Long Green, Maryland, USA
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