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 onset of September brings with it an average high-temperature of a refreshing 18.5°C (65.3°F), showing a negligible variation from the month before. In September, the recorded average low-temperature is a cool 12.7°C (54.9°F).Humidity
In Rayleigh, the average relative humidity in September is 77%.Rainfall
In Rayleigh, in September, during 9.7 rainfall days, 19mm (0.75") of precipitation is typically accumulated. Throughout the year, in Rayleigh, there are 148.1 rainfall days, and 293mm (11.54") of precipitation is accumulated.Snowfall
In Rayleigh, snow does not fall in May through October.Daylight
In Rayleigh, the average length of the day in September is 12h and 38min.On the first day of September, sunrise is at 6:11 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:37 pm BST.
Sunshine
In Rayleigh, the average sunshine in September is 8h.UV index
In Rayleigh, United Kingdom, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Ensure safety - Imperative it is to shield skin and eyes from damage. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Frequently asked questions
What is the usual temperature for Rayleigh in September?
What is the average humidity in September in Rayleigh?
How many days does it rain in September in Rayleigh?
When it does not snow in Rayleigh?
How many hours of daylight does Rayleigh have in September?
When is the sunrise / sunset in September in Rayleigh?
How many hours of sunshine does Rayleigh have in September?
What is the UV index intensity in September in Rayleigh?
Average temperature in September
Rayleigh, United Kingdom
- Average high temperature in September: 18.5°C
The warmest month (with the highest average high temperature) is August (20.9°C).
The month with the lowest average high temperature is January (6.9°C).
- Average low temperature in September: 12.7°C
The month with the highest average low temperature is August (14.7°C).
The coldest month (with the lowest average low temperature) is January (3.3°C).
Average pressure in September
Rayleigh, United Kingdom
- Average pressure in September: 1017mbar
The month with the highest atmospheric pressure is September (1017mbar).
The month with the lowest atmospheric pressure is November (1010.7mbar).
Average wind speed in September
Rayleigh, United Kingdom
- Average wind speed in September: 16.2km/h
The windiest month (with the highest average wind speed) is December (22km/h).
The calmest month (with the lowest average wind speed) is July (14.9km/h).
Average humidity in September
Rayleigh, United Kingdom
- Average humidity in September: 77%
The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is August (75%).
Average rainfall in September
Rayleigh, United Kingdom
- Average rainfall in September: 19mm
The wettest month (with the highest rainfall) is October (33mm).
The driest month (with the least rainfall) is April (15mm).
Average rainfall days in September
Rayleigh, United Kingdom
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is July (15.3 days).
The months with the least rainy days are February and September (9.7 days).
Average snowfall in September
Rayleigh, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (14mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Rayleigh, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.3 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
Rayleigh, 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: 8h and 0min
The months with the most sunshine are July and August (Average sunshine: 8h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in September
Rayleigh, United Kingdom
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is September (16.6 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in September
Rayleigh, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are June and 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
Rayleigh, United Kingdom
- Average cloud cover in September: 42
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 42).
Average visibility in September
Rayleigh, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are March, April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, November and December (9km).
Rayleigh, United Kingdom
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