September weather forecastWinchester-on-the-Severn, MD
September
Weather in September
September, the first month of the autumn in Winchester-on-the-Severn, is still a warm month, with an average temperature fluctuating between 18.1°C and 25°C.Temperature
Winchester-on-the-Severn observes a small decrease in the average high-temperature with the arrival of September, falling from August's 28.5°C to a still warm 25°C. During September nights, Winchester-on-the-Severn records an average temperature of 18.1°C.Humidity
In Winchester-on-the-Severn, the average relative humidity in September is 75%.Rainfall
In Winchester-on-the-Severn, during September, the rain falls for 10.5 days and regularly aggregates up to 16mm of precipitation. Throughout the year, there are 120.4 rainfall days, and 266mm of precipitation is accumulated.Snowfall
In Winchester-on-the-Severn, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:49 pm EDT.
Sunshine
In Winchester-on-the-Severn, the average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Winchester-on-the-Severn, MD
- Average high temperature in September: 25°C
The warmest month (with the highest average high temperature) is July (29.3°C).
The month with the lowest average high temperature is January (4.6°C).
- Average low temperature in September: 18.1°C
The month with the highest average low temperature is July (22.2°C).
The coldest month (with the lowest average low temperature) is January (-1.2°C).
Average pressure in September
Winchester-on-the-Severn, MD
- Average pressure in September: 1017.6mbar
The month with the highest atmospheric pressure is November (1020.4mbar).
The month with the lowest atmospheric pressure is June (1014mbar).
Average wind speed in September
Winchester-on-the-Severn, MD
- Average wind speed in September: 12.2km/h
The windiest month (with the highest average wind speed) is January (16.1km/h).
The calmest months (with the lowest average wind speed) are July and August (10.6km/h).
Average humidity in September
Winchester-on-the-Severn, MD
- Average humidity in September: 75%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March, April and November (72%).
Average rainfall in September
Winchester-on-the-Severn, MD
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is August (43mm).
The driest month (with the least rainfall) is January (12mm).
Average rainfall days in September
Winchester-on-the-Severn, MD
- Average rainfall days in September: 10.5 days
The months with the highest number of rainy days are July and August (14.3 days).
The month with the least rainy days is November (5.3 days).
Average snowfall in September
Winchester-on-the-Severn, MD
- Average snowfall in September: 0mm
The month with the highest snowfall is January (17mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Winchester-on-the-Severn, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.5 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
Winchester-on-the-Severn, MD
- 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: 9h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Winchester-on-the-Severn, MD
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is August (13.8 days).
Average UV index in September
Winchester-on-the-Severn, MD
- 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 and December (UV index 2).
Average cloud cover in September
Winchester-on-the-Severn, MD
- Average cloud cover in September: 33
The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Winchester-on-the-Severn, MD
- Average visibility in September: 9km
The months with the highest visibility are February, April, June, July, August, October and November (10km).
The months with the lowest visibility are January, March, May, September and December (9km).
