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
The arrival of September sees an average high-temperature of a comfortable 18.5°C (65.3°F), hardly diverging from August's 21.2°C (70.2°F). White Waltham's nights in September cool down to an average low-temperature of 10.5°C (50.9°F).Humidity
The average relative humidity in September in White Waltham is 79%.Rainfall
In White Waltham, in September, it is raining for 9.9 days, with typically 17mm (0.67") of accumulated precipitation. In White Waltham, during the entire year, the rain falls for 149.7 days and collects up to 270mm (10.63") of precipitation.Snowfall
April through November are months without snowfall.Daylight
In White Waltham, the average length of the day in September is 12h and 38min.On the first day of September in White Waltham, sunrise is at 6:16 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:42 pm BST.
Sunshine
In White Waltham, the average sunshine in September is 7.1h.UV index
In September, the average daily maximum UV index in White Waltham is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Act with care - The need to guard against sun damage is communicated. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Frequently asked questions
What is the average September temperature in White Waltham?
What is the average humidity in September in White Waltham?
How much does it rain in White Waltham in September?
When it does not snow in White Waltham?
What is the average length of the day in September in White Waltham?
What time are sunrise and sunset in September in White Waltham?
How many hours of sunshine does White Waltham have in September?
How high is the UV index in September in White Waltham?
Average temperature in September
White Waltham, 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
White Waltham, 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
White Waltham, 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
White Waltham, 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
White Waltham, 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
White Waltham, 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
White Waltham, 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
White Waltham, 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
White Waltham, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 7h and 1min
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
White Waltham, 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
White Waltham, 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
White Waltham, 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
White Waltham, 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).
White Waltham, United Kingdom
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