September weather forecastWinchester, VA
September
Weather in September
September marks the transition from summer to fall in Winchester. The weather becomes noticeably cooler, with the maximum average temperatures dropping to 76.5°F (24.7°C). Despite the dip in temperatures, rainfall persists, encouraging the growth of autumn foliage. Extended periods of sunlight allow the city’s residents and tourists to marvel at the changing scenery. It is indeed a wonderful time to experience the city’s stunning landscapes.Temperature
The transition into September subtly indicates a reduction in the average high-temperature, down to a still warm 76.5°F (24.7°C) from August's 83.8°F (28.8°C). An average low-temperature of 56.5°F (13.6°C) is observed during September nights.Humidity
The average relative humidity in September in Winchester is 78%.Rainfall
In Winchester, Virginia, in September, it is raining for 14 days, with typically 2.01" (51mm) of accumulated precipitation. Throughout the year, in Winchester, there are 167.2 rainfall days, and 29.61" (752mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Winchester, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:41 am and sunset at 7:42 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:56 pm EDT.
Sunshine
In September, the average sunshine in Winchester is 8.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Put precautions into practice - Ensuring skin and eye safety is a necessity. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Winchester, VA
- Average high temperature in September: 76.5°F
The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in September
Winchester, VA
- 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
Winchester, VA
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is March (7mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).
Average humidity in September
Winchester, VA
- Average humidity in September: 78%
The month with the highest relative humidity is October (79%).
The month with the lowest relative humidity is July (73%).
Average rainfall in September
Winchester, VA
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is January (1.97").
Average rainfall days in September
Winchester, VA
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is November (9.4 days).
Average snowfall in September
Winchester, VA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.45").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Winchester, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Winchester, VA
- Average daylight in September: 12h and 24min
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: 8h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
Winchester, VA
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is May (10 days).
Average UV index in September
Winchester, VA
- Average UV index in September: 4
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
Winchester, VA
- Average cloud cover in September: 37
The months with the most cloud cover are February, March and December (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Winchester, VA
- Average visibility in September: 5mi
The months with the highest visibility are February, April, June, July, August, November and December (6mi).
The months with the lowest visibility are January, March, May, September and October (5mi).
