September weather forecast
Triadelphia, WV

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Triadelphia, West Virginia, with an average temperature varying between 54.9°F (12.7°C) and 75.7°F (24.3°C).

Temperature

With the commencement of September, Triadelphia records a moderate temperature decline, with the average high easing from August's 82°F (27.8°C) to a still moderately hot 75.7°F (24.3°C). Nighttime temperature in Triadelphia experiences an average drop to a cool 54.9°F (12.7°C) in September.

Humidity

The average relative humidity in September is 79%.

Rainfall

In September, the rain falls for 13.2 days. Throughout September, 1.93" (49mm) of precipitation is accumulated. In Triadelphia, during the entire year, the rain falls for 166.3 days and collects up to 25.94" (659mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Triadelphia, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:50 am and sunset at 7:53 pm. On the last day of September, in Triadelphia, sunrise is at 7:18 am and sunset at 7:05 pm EDT.

Sunshine

The average sunshine in September in Triadelphia, West Virginia, is 8.2h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index, 4 during September, leads to the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Triadelphia in September?

The average high-temperature, in September, in Triadelphia, is 75.7°F (24.3°C), while the average low-temperature is 54.9°F (12.7°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is evaluated at 87.8°F (31°C).

What is the average humidity in September in Triadelphia?

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

How much does it rain in Triadelphia in September?

In Triadelphia, West Virginia, during September, the rain falls for 13.2 days and regularly aggregates up to 1.93" (49mm) of precipitation.

When it does not snow in Triadelphia?

May through October are months without snowfall in Triadelphia.

What is the average length of the day in September in Triadelphia?

In September, the average day length in Triadelphia, West Virginia, is 12h and 26min.

What time are sunrise and sunset in September in Triadelphia?

On the first day of September, sunrise is at 6:50 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.

How long on average sun shines in September in Triadelphia?

The average sunshine duration in September in Triadelphia, West Virginia, is 8.2h.

How high is the UV index in September in Triadelphia?

In Triadelphia, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
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
Triadelphia, WV

Average temperature in September - Triadelphia, WV
  • Average high temperature in September: 75.7°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (33.6°F).

  • Average low temperature in September: 54.9°F

The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).

Average pressure in September
Triadelphia, WV

Average pressure in September - Triadelphia, 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
Triadelphia, WV

Average wind speed in September - Triadelphia, WV
  • Average wind speed in September: 5.1mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.6mph).

Average humidity in September
Triadelphia, WV

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

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

Average rainfall in September
Triadelphia, WV

Average rainfall in September - Triadelphia, WV
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is November (1.69").

Average rainfall days in September
Triadelphia, WV

Average rainfall days in September - Triadelphia, WV
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is May (19.6 days).
The month with the least rainy days is January (9.4 days).

Average snowfall in September
Triadelphia, WV

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

The month with the highest snowfall is January (3.66").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Triadelphia, WV

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

The month with the highest number of snowfall days is January (14.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Triadelphia, WV
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in September
Triadelphia, WV

Average sunshine days in September - Triadelphia, WV
  • Average sunshine days in September: 14.1 days

The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is February (9.4 days).

Average UV index in September
Triadelphia, WV

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

The months with the highest UV index are May, June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in September
Triadelphia, WV

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

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in September
Triadelphia, WV

Average visibility in September - Triadelphia, 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 and February (4mi).

Triadelphia, West Virginia, USA

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