Contents
- Weather in September
- Frequently asked questions
- 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
Weather in September
Temperature
South Reston registers an average high-temperature of a still enjoyable 17.4°C (63.3°F) with the arrival of September, showing minor deviation from the preceding month. September nights observe an average temperature dip to a cool 12°C (53.6°F).Humidity
In September, the average relative humidity in South Reston is 78%.Rainfall
In South Reston, during September, the rain falls for 11.3 days and regularly aggregates up to 28mm (1.1") of precipitation. In South Reston, United Kingdom, during the entire year, the rain falls for 165.5 days and collects up to 413mm (16.26") of precipitation.Snowfall
In South Reston, snow does not fall in April through October.Daylight
In South Reston, United Kingdom, the average length of the day in September is 12h and 41min.On the first day of September, sunrise is at 6:10 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:38 pm BST.
Sunshine
In September, the average sunshine in South Reston is 7.3h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Frequently asked questions
What is the temperature in September in South Reston?
What is the average humidity in September in South Reston?
How many days does it rain in September in South Reston?
When it does not snow in South Reston?
How many hours of daylight does South Reston have in September?
When are sunrise and sunset in September in South Reston?
How long on average sun shines in September in South Reston?
How high is the UV index in September in South Reston?
Average temperature in September
South Reston, United Kingdom
- Average high temperature in September: 17.4°C
The warmest month (with the highest average high temperature) is August (19.8°C).
The month with the lowest average high temperature is January (6.2°C).
- Average low temperature in September: 12°C
The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is January (2.8°C).
Average pressure in September
South Reston, United Kingdom
- Average pressure in September: 1015.7mbar
The month with the highest atmospheric pressure is May (1016.4mbar).
The month with the lowest atmospheric pressure is November (1009.3mbar).
Average wind speed in September
South Reston, United Kingdom
- Average wind speed in September: 16.4km/h
The windiest month (with the highest average wind speed) is December (22.3km/h).
The calmest month (with the lowest average wind speed) is July (14.6km/h).
Average humidity in September
South Reston, United Kingdom
- Average humidity in September: 78%
The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is August (76%).
Average rainfall in September
South Reston, United Kingdom
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is October (48mm).
The driest month (with the least rainfall) is April (18mm).
Average rainfall days in September
South Reston, United Kingdom
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is September (11.3 days).
Average snowfall in September
South Reston, United Kingdom
- 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
South Reston, United Kingdom
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (3.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
South Reston, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in September: 7h and 2min
The month with the most sunshine is August (Average sunshine: 8h and 12min).
The months with the least sunshine are February and November (Average sunshine: 3h and 54min).
Average sunshine days in September
South Reston, United Kingdom
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is April (15.7 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in September
South Reston, United Kingdom
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
South Reston, United Kingdom
- Average cloud cover in September: 47
The month with the most cloud cover is February (Cloud cover 61).
The months with the least cloud cover are April and September (Cloud cover 47).
Average visibility in September
South Reston, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are March, August, September and October (10km).
The months with the lowest visibility are January, February, April, May, June, July, November and December (9km).
South Reston, United Kingdom
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