September weather forecastNapier, WV
September
Weather in September
September, the first month of the autumn in Napier, is also a moderately hot month, with an average temperature varying between 75.6°F (24.2°C) and 54.5°F (12.5°C).Temperature
With the beginning of September, the average high-temperature shows a small decrease, transitioning from 81.5°F (27.5°C) in August to a still warm 75.6°F (24.2°C). The average temperature in Napier drops to a fresh 54.5°F (12.5°C) during the night in the month of September.Humidity
The average relative humidity in September in Napier is 78%.Rainfall
The month with the least rainfall is September, when the rain falls for 14.8 days and typically collects 1.93" (49mm) of precipitation.Snowfall
In Napier, snow does not fall in June through September.Daylight
In September, the average length of the day in Napier is 12h and 26min.On the first day of the month, sunrise is at 6:52 am and sunset at 7:52 pm. On the last day of September, in Napier, West Virginia, sunrise is at 7:18 am and sunset at 7:06 pm EDT.
Sunshine
In September, the average sunshine in Napier is 8.7h.UV index
The average daily maximum UV index in September in Napier is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: A daily high UV index of 4 in September leads to these guidelines:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Napier, WV
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (36.5°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Napier, WV
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Napier, WV
- Average wind speed in September: 4.4mph
The windiest months (with the highest average wind speed) are January and February (7mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in September
Napier, WV
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (83%).
The months with the lowest relative humidity are June, August and November (77%).
Average rainfall in September
Napier, WV
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in September
Napier, WV
- Average rainfall days in September: 14.8 days
The month with the highest number of rainy days is May (21.5 days).
The month with the least rainy days is February (12.9 days).
Average snowfall in September
Napier, WV
- Average snowfall in September: 0"
The month with the highest snowfall is January (8.46").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Napier, WV
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (16.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Napier, WV
- Average daylight in September: 12h and 24min
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 42min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Napier, WV
- Average sunshine days in September: 12.6 days
The month with the most sunshine days is October (14.3 days).
The months with the least sunshine days are January and February (7.3 days).
Average UV index in September
Napier, WV
- Average UV index in September: 4
The months with the highest UV index are 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
Napier, WV
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Napier, WV
- Average visibility in September: 5mi
The months with the highest visibility are April and November (6mi).
The month with the lowest visibility is January (4mi).
