September weather forecastDean, WV

September

Weather in September

The first month of the autumn, September, is also a moderately hot month in Dean, West Virginia, with an average temperature ranging between min 55.4°F (13°C) and max 76.6°F (24.8°C).

Temperature

The move into September indicates a slight reduction in the average high-temperature, down from August's 82.8°F (28.2°C) to a still warm 76.6°F (24.8°C). Throughout September in Dean, a steady low-temperature average of 55.4°F (13°C) is noted.

Humidity

In September, the average relative humidity is 79%.

Rainfall

September is the month with the least rainfall. Rain falls for 13.6 days and accumulates 1.61" (41mm) of precipitation.

Snowfall

In Dean, snow does not fall in May through October.

Daylight

In September, the average length of the day is 12h and 26min.
On the first day of the month, sunrise is at 6:51 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:18 am and sunset at 7:05 pm EDT.

Sunshine

In Dean, the average sunshine in September is 8.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: A daily high UV index of 4 in September leads to these guidelines:
Undertake precautions - It is suggested to shield oneself from sunburn. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Boost your sun resistance with garments that are densely woven yet spacious.

Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

During September, Dean experiences an average high-temperature of 76.6°F (24.8°C) and a low-temperature of 55.4°F (13°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in August is calculated to be 89.6°F (32°C).

In Dean, the average relative humidity in September is 79%.

The month with the least rainfall is September, when the rain falls for 13.6 days and typically collects 1.61" (41mm) of precipitation.

In September, the rain falls for 13.6 days. Throughout September, 1.61" (41mm) of precipitation is accumulated.

May through October are months without snowfall.

In Dean, the average day length in September is 12h and 26min.

On the first day of September, sunrise is at 6:51 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:05 pm EDT.

The average sunshine duration in September is 8.4h.

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

82.8°F

76.6°F

63.3°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

4.6mph

4.9mph

6mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

15.8

13.6

13.5

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

12.9

14.7

15.9

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Dean, WV

Average high temperature in September: 76.6°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (35.4°F).

Average low temperature in September: 55.4°F

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).

Average pressure in September
Dean, WV

Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Dean, WV

Average wind speed in September: 4.7mph

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 (4.2mph).

Average humidity in September
Dean, WV

Average humidity in September: 79%

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (77%).

Average rainfall in September
Dean, WV

Average rainfall in September: 1.61"

The wettest month (with the highest rainfall) is May (2.91").
The driest month (with the least rainfall) is September (1.61").

Average rainfall days in September
Dean, WV

Average rainfall days in September: 13.6 days

The month with the highest number of rainy days is May (19.6 days).
The month with the least rainy days is January (10.2 days).

Average snowfall in September
Dean, WV

Average snowfall in September: 0"

The month with the highest snowfall is January (3.19").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Dean, WV

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (14.7 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
Dean, WV

Average daylight in September: 12h and 24min

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 24min).

Average sunshine in September: 8h and 24min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).