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 temperature, down from a moderately hot 83.7°F (28.7°C) in August to a still warm 77.5°F (25.3°C). Throughout September, an average low-temperature of 64.4°F (18°C) is expected in Helen.Humidity
In Helen, the average relative humidity in September is 77%.Rainfall
In Helen, in September, during 13.9 rainfall days, 2.68" (68mm) of precipitation is typically accumulated. In Helen, during the entire year, the rain falls for 158.1 days and collects up to 33.07" (840mm) of precipitation.Snowfall
In Helen, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 25min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:50 pm EDT.
Sunshine
In Helen, the average sunshine in September is 9h.UV index
In Helen, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
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?
When is the sunrise / sunset in September?
How many hours of sunshine does Helen have in September?
What is the UV index intensity in September?
Average temperature in September
Helen, MD
- Average high temperature in September: 77.5°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in September: 64.4°F
The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (30°F).
Average pressure in September
Helen, MD
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Helen, MD
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is March (9.2mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).
Average humidity in September
Helen, MD
- Average humidity in September: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is January (72%).
Average rainfall in September
Helen, MD
- Average rainfall in September: 2.68"
The wettest month (with the highest rainfall) is July (4.41").
The driest month (with the least rainfall) is January (1.81").
Average rainfall days in September
Helen, MD
- Average rainfall days in September: 13.9 days
The month with the highest number of rainy days is August (17.7 days).
The month with the least rainy days is November (8 days).
Average snowfall in September
Helen, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.85").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Helen, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Helen, MD
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Helen, MD
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is August (11.3 days).
Average UV index in September
Helen, 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 and December (UV index 2).
Average cloud cover in September
Helen, MD
- Average cloud cover in September: 35
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Helen, 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).
Helen, Maryland, USA
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