September weather forecast
Alliance, WV

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Weather in September

September, the first month of the autumn in Alliance, is also a moderately hot month, with an average temperature fluctuating between 76.1°F (24.5°C) and 54.7°F (12.6°C).

Temperature

September brings a slight decrease in the average high-temperature, shifting from a moderately hot 82°F (27.8°C) in August to a still warm 76.1°F (24.5°C). During September, Alliance observes a consistent average nighttime temperature of 54.7°F (12.6°C).

Humidity

The average relative humidity in September is 79%.

Rainfall

In Alliance, in September, during 15.4 rainfall days, 2.48" (63mm) of precipitation is typically accumulated. Throughout the year, there are 188.6 rainfall days, and 39.17" (995mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Alliance.

Daylight

The average length of the day in September in Alliance, West Virginia, is 12h and 26min.
On the first day of the month, sunrise is at 6:50 am and sunset at 7:52 pm. On the last day of September, sunrise is at 7:17 am and sunset at 7:05 pm EDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

In Alliance, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, a regular UV index of 4 translates into these guidelines:
Take measures. Individuals with light skin might experience burns in under 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.

Frequently asked questions

What are the temperatures in September?

The high-temperature, in September, in Alliance, is 76.1°F (24.5°C), while the low-temperature averages to 54.7°F (12.6°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 87.8°F (31°C).

What is the average humidity in September?

In September, the average relative humidity is 79%.

How many days does it rain in September?

In Alliance, in September, it is raining for 15.4 days, with typically 2.48" (63mm) of accumulated precipitation.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

In Alliance, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Alliance have in September?

The average day length in September is 12h and 26min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:50 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:05 pm EDT.

How long on average sun shines in September?

In Alliance, the average sunshine duration in September is 8.5h.

What is the UV index reading in September?

In Alliance, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Alliance, WV

Average temperature in September - Alliance, WV
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in September: 54.7°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in September
Alliance, WV

Average pressure in September - Alliance, 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 (29.96"Hg).

Average wind speed in September
Alliance, WV

Average wind speed in September - Alliance, WV
  • Average wind speed in September: 4.5mph

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
Alliance, WV

Average humidity in September - Alliance, WV
  • Average humidity in September: 79%

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

Average rainfall in September
Alliance, WV

Average rainfall in September - Alliance, WV
  • Average rainfall in September: 2.48"

The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is November (2.24").

Average rainfall days in September
Alliance, WV

Average rainfall days in September - Alliance, WV
  • Average rainfall days in September: 15.4 days

The month with the highest number of rainy days is May (21.3 days).
The month with the least rainy days is January (10.8 days).

Average snowfall in September
Alliance, WV

Average snowfall in September - Alliance, WV
  • Average snowfall in September: 0"

The month with the highest snowfall is February (6.18").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Alliance, WV

Average snowfall days in September - Alliance, WV
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (15 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Alliance, WV

Average daylight in September / Average sunshine in September - Alliance, WV
  • 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 24min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).

Average sunshine days in September
Alliance, WV

Average sunshine days in September - Alliance, WV
  • Average sunshine days in September: 12.2 days

The month with the most sunshine days is November (15.4 days).
The month with the least sunshine days is May (7.8 days).

Average UV index in September
Alliance, WV

Average UV index in September - Alliance, WV
  • Average UV index in September: 4

The months with the highest UV index are May and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Alliance, WV

Average cloud cover in September - Alliance, WV
  • Average cloud cover in September: 40

The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 37).

Average visibility in September
Alliance, WV

Average visibility in September - Alliance, WV
  • Average visibility in September: 5mi

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January and February (4mi).

Alliance, West Virginia, USA

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