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 arrival of September suggests a slight decrease in the average high-temperature, moving from 82.9°F (28.3°C) in August to a still warm 77°F (25°C). Henderson's nighttime temperature in September falls to an average of 62.8°F (17.1°C).Humidity
In Henderson, the average relative humidity in September is 78%.Rainfall
In Henderson, in September, it is raining for 12.3 days, with typically 2.05" (52mm) of accumulated precipitation. In Henderson, during the entire year, the rain falls for 156.8 days and collects up to 31.97" (812mm) of precipitation.Snowfall
May through October are months without snowfall in Henderson.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:33 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:46 pm EDT.
Sunshine
In Henderson, the average sunshine in September is 9.2h.UV index
In Henderson, the average daily maximum UV index in September 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: The UV index of 5 during September leads to these advisories:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September in Henderson?
When are sunrise and sunset in September?
How many hours of sunshine does Henderson have in September?
What is the UV index intensity in September?
Average temperature in September
Henderson, MD
- Average high temperature in September: 77°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (40.5°F).
- Average low temperature in September: 62.8°F
The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).
Average pressure in September
Henderson, 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 (29.94"Hg).
Average wind speed in September
Henderson, MD
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is February (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in September
Henderson, MD
- Average humidity in September: 78%
The months with the highest relative humidity are May and August (79%).
The months with the lowest relative humidity are January, March, April and November (74%).
Average rainfall in September
Henderson, MD
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is July (3.46").
The driest month (with the least rainfall) is January (1.97").
Average rainfall days in September
Henderson, MD
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is November (8.5 days).
Average snowfall in September
Henderson, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Henderson, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.9 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
Henderson, 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: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Henderson, MD
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in September
Henderson, 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
Henderson, MD
- Average cloud cover in September: 34
The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Henderson, 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).
Henderson, Maryland, USA
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