September weather forecastManassas Park, VA
September
Weather in September
September presents a break from the summer heat in Manassas Park as temperatures begin to descend, marking the onset of fall. A unique feature of September is the absence of snowfall, providing a clear distinction from the cold months. The cityscape starts transforming with trees adorning hues of fall. September's weather provides a respite from August's heat and humidity, moving towards the cooling patterns of October.Temperature
The onset of September brings a small shift in high-temperatures, falling from 85.8°F (29.9°C) in August to a still moderately hot 79°F (26.1°C). Manassas Park, in September, observes a steady average low-temperature of 59.7°F (15.4°C).Humidity
In Manassas Park, Virginia, the average relative humidity in September is 76%.Rainfall
September is the month with the least rainfall in Manassas Park. Rain falls for 12.7 days and accumulates 1.93" (49mm) of precipitation.Snowfall
May through October are months without snowfall in Manassas Park.Daylight
In Manassas Park, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:39 pm. On the last day of September, in Manassas Park, sunrise is at 7:05 am and sunset at 6:53 pm EDT.
Sunshine
In September, the average sunshine is 8.7h.UV index
In Manassas Park, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, a daily UV index of 5 turns into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Manassas Park, VA
- Average high temperature in September: 79°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (40.6°F).
- Average low temperature in September: 59.7°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in September
Manassas Park, 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
Manassas Park, VA
- Average wind speed in September: 5.1mph
The windiest months (with the highest average wind speed) are March and April (7mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in September
Manassas Park, VA
- Average humidity in September: 76%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Manassas Park, VA
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in September
Manassas Park, VA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in September
Manassas Park, VA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.7").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Manassas Park, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (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
Manassas Park, 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: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 12min).
Average sunshine days in September
Manassas Park, VA
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.7 days).
Average UV index in September
Manassas Park, 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
Manassas Park, VA
- Average cloud cover in September: 38
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Manassas Park, VA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, July, August and November (6mi).
The months with the lowest visibility are May, September, October and December (5mi).
