September weather forecastFalls Church, VA
September
Weather in September
September brings the dawn of autumn to Falls Church, with temperatures decreasing to an average high of 78.6°F (25.9°C). It's a month characterized by refreshing breezes and vibrant Fall colors starting to coat the city. As the weather cools down, precipitation also decreases, signaling the transition into the drier months. Given the comfortable weather, it's perfect for nature walks to appreciate the changing shades of the foliage. The blend of beauty and congenial weather makes September a delightful time in Falls Church.Temperature
The start of September in Falls Church comes with a small reduction in the average high-temperature, subtly receding from 85.6°F (29.8°C) in August to a still moderately hot 78.6°F (25.9°C). Nighttime temperature dips to a mean of 61.2°F (16.2°C) during September.Humidity
The average relative humidity in September is 74%.Rainfall
The months with the least rainfall are January and September Rain falls for 8.1 days and accumulates 0.51" (13mm) of rain.Snowfall
In Falls Church, snow does not fall in May through October.Daylight
In Falls Church, 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 7:38 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm EDT.
Sunshine
In Falls Church, the average sunshine in September is 9h.UV index
In Falls Church, Virginia, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Adopt protective measures - It is advised to guard against sun damage. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Falls Church, VA
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (40.1°F).
- Average low temperature in September: 61.2°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure in September
Falls Church, 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
Falls Church, VA
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in September
Falls Church, VA
- Average humidity in September: 74%
The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Falls Church, VA
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is August (1.5").
The driest months (with the least rainfall) are January and September (0.51").
Average rainfall days in September
Falls Church, VA
- Average rainfall days in September: 8.1 days
The month with the highest number of rainy days is July (13.5 days).
The month with the least rainy days is November (5.6 days).
Average snowfall in September
Falls Church, VA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Falls Church, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.6 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
Falls Church, VA
- Average daylight in September: 12h and 24min
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 54min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).
Average sunshine days in September
Falls Church, VA
- Average sunshine days in September: 19.1 days
The month with the most sunshine days is November (23 days).
The month with the least sunshine days is July (14.3 days).
Average UV index in September
Falls Church, 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, November and December (UV index 2).
Average cloud cover in September
Falls Church, 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
Falls Church, 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).
