September weather forecast
Rio, WV

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Weather in September

The first month of the autumn, September, is still a warm month in Rio, West Virginia, with temperature in the range of an average low of 54°F (12.2°C) and an average high of 75.2°F (24°C).

Temperature

September is marked by a subtle drop in average high-temperatures, transitioning from a warm 82.2°F (27.9°C) in August to a still moderately hot 75.2°F (24°C). In Rio, September's nights observe an average temperature dip to a fresh 54°F (12.2°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Rio, in September, it is raining for 14.5 days, with typically 2.01" (51mm) of accumulated precipitation. Throughout the year, there are 166 rainfall days, and 25.83" (656mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:44 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:58 pm EDT.

Sunshine

In September, the average sunshine in Rio is 9h.

UV index

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 ordinary person.
Note: In September, the maximum UV index of 4 suggests this advice:
Ensure safety - Sun damage prevention is strongly urged. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.

Frequently asked questions

What is the average September temperature in Rio?

An average high-temperature, in September, in Rio, is 75.2°F (24°C) and the average low-temperature is 54°F (12.2°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, is computed to be 87.8°F (31°C).

What is the average humidity in September in Rio?

The average relative humidity in September in Rio is 78%.

How many days does it rain in September in Rio?

In Rio, during September, the rain falls for 14.5 days and regularly aggregates up to 2.01" (51mm) of precipitation.

When it does not snow in Rio?

June through September are months without snowfall in Rio, West Virginia.

Does it snow in Rio in September?

In Rio, West Virginia, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Rio have in September?

The average day length in September in Rio, West Virginia, is 12h and 26min.

When are sunrise and sunset in September in Rio?

On the first day of September in Rio, sunrise is at 6:44 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:58 pm EDT.

How many hours of sunshine does Rio have in September?

In Rio, West Virginia, the average sunshine duration in September is 9h.

How high is the UV index in September in Rio?

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe 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
Rio, WV

Average temperature in September - Rio, WV
  • Average high temperature in September: 75.2°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in September: 54°F

The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in September
Rio, WV

Average pressure in September - Rio, WV
  • Average pressure in September: 30.06"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
Rio, WV

Average wind speed in September - Rio, WV
  • Average wind speed in September: 4.3mph

The windiest month (with the highest average wind speed) is February (7.1mph).
The calmest month (with the lowest average wind speed) is August (4mph).

Average humidity in September
Rio, WV

Average humidity in September - Rio, WV
  • Average humidity in September: 78%

The month with the highest relative humidity is October (79%).
The months with the lowest relative humidity are April and July (74%).

Average rainfall in September
Rio, WV

Average rainfall in September - Rio, WV
  • Average rainfall in September: 2.01"

The wettest month (with the highest rainfall) is May (3.11").
The driest months (with the least rainfall) are February and November (1.73").

Average rainfall days in September
Rio, WV

Average rainfall days in September - Rio, WV
  • Average rainfall days in September: 14.5 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is November (9.1 days).

Average snowfall in September
Rio, WV

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

The month with the highest snowfall is March (4.21").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Rio, WV

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

The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Rio, 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 30min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 6min).

Average sunshine days in September
Rio, WV

Average sunshine days in September - Rio, WV
  • Average sunshine days in September: 13 days

The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is May (10.1 days).

Average UV index in September
Rio, WV

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

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

Average cloud cover in September
Rio, WV

Average cloud cover in September - Rio, WV
  • Average cloud cover in September: 37

The month with the most cloud cover is January (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in September
Rio, WV

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

The months with the highest visibility are April, June, July, November and December (6mi).
The months with the lowest visibility are January, February, March, May, August, September and October (5mi).

Rio, West Virginia, USA

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