September weather forecastMayfair, United Kingdom
September
Weather in September
September, the first month of the autumn in Mayfair, is also an enjoyable month, with an average temperature ranging between min 11.3°C (52.3°F) and max 19.1°C (66.4°F).Temperature
The beginning of September records an average high-temperature of a refreshing 19.1°C (66.4°F), marking a negligible difference from August's 21.9°C (71.4°F). The temperature dips to an average of 11.3°C (52.3°F) during September nights.Humidity
The average relative humidity in September in Mayfair is 76%.Rainfall
In Mayfair, in September, it is raining for 11.9 days, with typically 24mm (0.94") of accumulated precipitation. In Mayfair, during the entire year, the rain falls for 166.8 days and collects up to 362mm (14.25") of precipitation.Snowfall
May through October are months without snowfall in Mayfair.Daylight
In Mayfair, the average length of the day in September is 12h and 38min.On the first day of the month, sunrise is at 6:14 am and sunset at 7:46 pm. On the last day of September, in Mayfair, sunrise is at 7:00 am and sunset at 6:40 pm BST.
Sunshine
The average sunshine in September in Mayfair is 7.1h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Put precautions into practice - Ensuring skin and eye safety is a necessity. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mayfair, United Kingdom
- Average high temperature in September: 19.1°C
The warmest month (with the highest average high temperature) is July (22.3°C).
The month with the lowest average high temperature is January (6.8°C).
- Average low temperature in September: 11.3°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 (2.2°C).
Average pressure in September
Mayfair, 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 (1010.6mbar).
Average wind speed in September
Mayfair, United Kingdom
- Average wind speed in September: 12.6km/h
The windiest month (with the highest average wind speed) is February (17.3km/h).
The calmest month (with the lowest average wind speed) is September (12.6km/h).
Average humidity in September
Mayfair, United Kingdom
- Average humidity in September: 76%
The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is August (72%).
Average rainfall in September
Mayfair, United Kingdom
- Average rainfall in September: 24mm
The wettest months (with the highest rainfall) are June and December (40mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days in September
Mayfair, United Kingdom
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (11.5 days).
Average snowfall in September
Mayfair, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (15mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Mayfair, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 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
Mayfair, United Kingdom
- Average daylight in September: 12h and 36min
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 6min
The month with the most sunshine is August (Average sunshine: 7h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).
Average sunshine days in September
Mayfair, United Kingdom
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is October (15.9 days).
The month with the least sunshine days is June (10.1 days).
Average UV index in September
Mayfair, 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, March, November and December (UV index 2).
Average cloud cover in September
Mayfair, United Kingdom
- Average cloud cover in September: 50
The months with the most cloud cover are February and November (Cloud cover 61).
The months with the least cloud cover are April, August and September (Cloud cover 50).
Average visibility in September
Mayfair, 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).
