September weather forecastAlderson, WV
September
Weather in September
September in Alderson, West Virginia, marks the beginning of autumn. The weather during this month cools down noticeably from the summer highs with daily average high temperatures decreasing to around 73.4°F (23°C). Despite the slight decrease in temperature, it is still a comfortable and vibrant time of year to experience Alderson. The amount of rainfall in September tends to decrease, recording an average of 1.81" (46mm). With the approach of October, expect to experience further lowering of temperatures, accounting for the beautiful fall foliage.Temperature
September brings a minor shift in the average high-temperature, adjusting from a warm 79.9°F (26.6°C) in August to a still moderately hot 73.4°F (23°C). An average minimum temperature of 52°F (11.1°C) is recorded in Alderson during the month of September.Humidity
In September, the average relative humidity is 81%.Rainfall
September is the month with the least rainfall. Rain falls for 15.5 days and accumulates 1.81" (46mm) of precipitation.Snowfall
In Alderson, snow does not fall in June through September.Daylight
In Alderson, the average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:53 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:06 pm EDT.
Sunshine
The average sunshine in September is 8.1h.UV index
In Alderson, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Alderson, WV
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (36.3°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is July (58.3°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).
Average pressure in September
Alderson, 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 (29.98"Hg).
Average wind speed in September
Alderson, WV
- Average wind speed in September: 4.4mph
The windiest months (with the highest average wind speed) are January and February (7.3mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Alderson, WV
- Average humidity in September: 81%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is June (78%).
Average rainfall in September
Alderson, WV
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days in September
Alderson, WV
- Average rainfall days in September: 15.5 days
The month with the highest number of rainy days is May (22.2 days).
The month with the least rainy days is November (10.2 days).
Average snowfall in September
Alderson, WV
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Alderson, 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 June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Alderson, WV
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 8h and 6min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Alderson, WV
- Average sunshine days in September: 11.5 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is May (7.7 days).
Average UV index in September
Alderson, WV
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Alderson, WV
- Average cloud cover in September: 45
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 40).
Average visibility in September
Alderson, WV
- Average visibility in September: 4mi
The months with the highest visibility are March, April, June, July, November and December (5mi).
The months with the lowest visibility are January, February, May, August, September and October (4mi).
