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 beginning of September brings a slight decrease in the average high-temperature, transitioning from 85.5°F (29.7°C) in August to a still moderately hot 78.6°F (25.9°C). Swann witnesses an average low-temperature of 57.6°F (14.2°C) throughout the month of September.Humidity
In September, the average relative humidity in Swann is 76%.Rainfall
The month with the least rainfall is September, when the rain falls for 12.8 days and typically collects 1.93" (49mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:58 am and sunset at 7:58 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:12 pm EDT.
Sunshine
The average sunshine in September is 8.1h.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 exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
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?
What is the driest month?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Swann have in September?
When are sunrise and sunset in September in Swann?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Swann, WV
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in September: 57.6°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).
Average pressure in September
Swann, WV
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Swann, WV
- Average wind speed in September: 4.5mph
The windiest months (with the highest average wind speed) are January, February and April (6.6mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in September
Swann, WV
- Average humidity in September: 76%
The months with the highest relative humidity are January, February and December (81%).
The month with the lowest relative humidity is August (74%).
Average rainfall in September
Swann, WV
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is May (3.9").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in September
Swann, WV
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is November (10.7 days).
Average snowfall in September
Swann, WV
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.25").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Swann, WV
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Swann, WV
- 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: 8h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Swann, WV
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is May (9 days).
Average UV index in September
Swann, WV
- Average UV index in September: 4
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 and December (UV index 2).
Average cloud cover in September
Swann, WV
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Swann, WV
- Average visibility in September: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Swann, West Virginia, USA
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