September weather forecast
Clifton, VA

• Average temperature in September
• Average pressure in September
• Average wind speed in September
• Average humidity in September
• Average rainfall in September
• Average rainfall days in September
• Average snowfall in September
• Average snowfall days in September
• Average daylight in September
• Average sunshine in September
• Average sunshine days in September
• Average UV index in September
• Average cloud cover in September
• Average visibility in September

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).

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).

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).

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%).

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").

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).

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").

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).

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

• Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
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 48min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 12min).

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).

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).

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).

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).