September weather forecastOld Windsor, United Kingdom
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Old Windsor, United Kingdom, with an average temperature fluctuating between 18.5°C (65.3°F) and 10.5°C (50.9°F).Temperature
The commencement of September notes an average high-temperature of a refreshing 18.5°C (65.3°F), exhibiting little difference from the previous month. Old Windsor's temperature in September lowers to a consistent average of 10.5°C (50.9°F) during the nights.Humidity
In September, the average relative humidity in Old Windsor is 79%.Rainfall
In Old Windsor, during September, the rain falls for 9.9 days and regularly aggregates up to 17mm (0.67") of precipitation. In Old Windsor, during the entire year, the rain falls for 149.7 days and collects up to 270mm (10.63") of precipitation.Snowfall
In Old Windsor, snow does not fall in April through November.Daylight
In Old Windsor, the average length of the day in September is 12h and 38min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:48 pm. On the last day of September, in Old Windsor, sunrise is at 7:02 am and sunset at 6:41 pm BST.
Sunshine
The average sunshine in September is 7.1h.UV index
The average daily maximum UV index in September in Old Windsor is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The UV index of 4 during September leads to these advisories:
Undertake precautions - Obligation exists to protect against skin and eye damage. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Old Windsor, United Kingdom
- Average high temperature in September: 18.5°C
The warmest month (with the highest average high temperature) is July (21.5°C).
The month with the lowest average high temperature is January (6.6°C).
- Average low temperature in September: 10.5°C
The month with the highest average low temperature is August (13.2°C).
The coldest month (with the lowest average low temperature) is January (1.8°C).
Average pressure in September
Old Windsor, United Kingdom
- Average pressure in September: 1016.9mbar
The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.4mbar).
Average wind speed in September
Old Windsor, United Kingdom
- Average wind speed in September: 12.8km/h
The windiest month (with the highest average wind speed) is February (17.7km/h).
The calmest months (with the lowest average wind speed) are July and September (12.8km/h).
Average humidity in September
Old Windsor, United Kingdom
- Average humidity in September: 79%
The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are July and August (76%).
Average rainfall in September
Old Windsor, United Kingdom
- Average rainfall in September: 17mm
The wettest month (with the highest rainfall) is June (34mm).
The driest month (with the least rainfall) is April (16mm).
Average rainfall days in September
Old Windsor, United Kingdom
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is July (16.2 days).
The month with the least rainy days is September (9.9 days).
Average snowfall in September
Old Windsor, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (12mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Old Windsor, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 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
Old Windsor, United Kingdom
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 30min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 7h and 6min
The month with the most sunshine is July (Average sunshine: 7h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in September
Old Windsor, United Kingdom
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is September (16.9 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in September
Old Windsor, 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
Old Windsor, United Kingdom
- Average cloud cover in September: 50
The month with the most cloud cover is November (Cloud cover 61).
The month with the least cloud cover is April (Cloud cover 49).
Average visibility in September
Old Windsor, United Kingdom
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (9km).
The month with the lowest visibility is November (8km).
