September weather forecast
Clifton, VA

Weather in September

September, the first month of the autumn in Clifton, is still a warm month, with an average temperature fluctuating between 78.6°F (25.9°C) and 60.6°F (15.9°C).

Temperature

In Clifton, the average high-temperature in September slightly decreases from 85.6°F (29.8°C) in August to a still moderately hot 78.6°F (25.9°C). In September, the average low-temperature is 60.6°F (15.9°C).

Humidity

In September, the average relative humidity in Clifton is 75%.

Rainfall

In Clifton, in September, during 13.2 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. In Clifton, during the entire year, the rain falls for 166.5 days and collects up to 32.76" (832mm) of precipitation.

Snowfall

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

Daylight

In Clifton, the average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:38 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:54 pm EDT.

Sunshine

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

UV index

The average daily maximum UV index in September in Clifton is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in Clifton?

In Clifton, the average relative humidity in September is 75%.

How many days does it rain in September in Clifton?

In September, the rain falls for 13.2 days. Throughout September, 2.13" (54mm) of precipitation is accumulated.

When it does not snow in Clifton?

May through October are months without snowfall.

How many hours of daylight does Clifton have in September?

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

When is the sunrise / sunset in September in Clifton?

In September, on the first day of the month, sunrise is at 6:38 am and sunset at 7:40 pm. On the last day of the month, in Clifton, Virginia, sunrise is at 7:04 am and sunset at 6:54 pm EDT.

How many hours of sunshine does Clifton have in September?

In September, the average sunshine duration is 9h.

What is the UV index reading in September in Clifton?

The average daily maximum UV index in September in Clifton, Virginia, is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Clifton, VA

Average temperature in September - Clifton, VA
  • Average high temperature in September: 78.6°F

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (40.5°F).

  • Average low temperature in September: 60.6°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).

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Average pressure in September
Clifton, VA

Average pressure in September - Clifton, VA
  • 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).

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Average wind speed in September
Clifton, VA

Average wind speed in September - Clifton, VA
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is March (7.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

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Average humidity in September
Clifton, VA

Average humidity in September - Clifton, VA
  • Average humidity in September: 75%

The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is July (71%).

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Average rainfall in September
Clifton, VA

Average rainfall in September - Clifton, VA
  • Average rainfall in September: 2.13"

The wettest month (with the highest rainfall) is August (3.94").
The driest month (with the least rainfall) is January (2.09").

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Average rainfall days in September
Clifton, VA

Average rainfall days in September - Clifton, VA
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is November (9.3 days).

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Average snowfall in September
Clifton, VA

Average snowfall in September - Clifton, VA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Clifton, VA

Average snowfall days in September - Clifton, VA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Clifton, VA

Average daylight in September / Average sunshine in September - Clifton, VA
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 50min).
The month with the shortest days is December (Average daylight: 9h and 31min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 12min).

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Average sunshine days in September
Clifton, VA

Average sunshine days in September - Clifton, VA
  • Average sunshine days in September: 14.8 days

The month with the most sunshine days is November (19.3 days).
The months with the least sunshine days are May and July (10.5 days).

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Average UV index in September
Clifton, VA

Average UV index in September - Clifton, VA
  • Average UV index in September: 5

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

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Average cloud cover in September
Clifton, VA

Average cloud cover in September - Clifton, VA
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in September
Clifton, VA

Average visibility in September - Clifton, VA
  • Average visibility in September: 6mi

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

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