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 sea temperature 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 advent of September in London sees the average high-temperature at a still moderately hot 26.9°C (80.4°F), subtly shifted from August's 27.1°C (80.8°F). Nighttime temperatures during September report a consistent average of 25.9°C (78.6°F).Humidity
August through November, with an average relative humidity of 78%, are the least humid months.Rainfall
In London, Kiribati, in September, it is raining for 6.9 days, with typically 19mm (0.75") of accumulated precipitation. Throughout the year, in London, there are 156.7 rainfall days, and 491mm (19.33") of precipitation is accumulated.Sea temperature
In September, the average sea temperature in London is 27.8°C (82°F).Note: Swimming, diving, and similar water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as very agreeable and pleasurable for lengthy periods without discomfort.
Daylight
In London, the average length of the day in September is 12h and 8min.On the first day of the month, sunrise is at 06:25 and sunset at 18:34. On the last day of September, in London, sunrise is at 06:16 and sunset at 18:22 +14.
Sunshine
The average sunshine in September is 7.7h.UV index
The months with the highest UV index are January through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the average person.Note: An average UV index of 7 in September transforms into this advice:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Caution! The reflection of sand and water significantly amplifies the Sun's UV radiation.
Frequently asked questions
What are September temperatures in London?
What are the least humid months in London?
What is the average humidity in September in London?
How much does it rain in London in September?
How warm is the water in September in London?
What is the average length of the day in September in London?
When are sunrise and sunset in September in London?
How long on average sun shines in September in London?
What is the month with the highest UV index in London?
What is the UV index reading in September in London?
Average temperature in September
London, Kiribati
- Average high temperature in September: 26.9°C
The warmest month (with the highest average high temperature) is June (27.6°C).
The month with the lowest average high temperature is January (26.3°C).
- Average low temperature in September: 25.9°C
The month with the highest average low temperature is May (26.5°C).
The coldest month (with the lowest average low temperature) is March (25.5°C).
Average pressure in September
London, Kiribati
- Average pressure in September: 1010.5mbar
The month with the highest atmospheric pressure is September (1010.5mbar).
The month with the lowest atmospheric pressure is December (1008.8mbar).
Average wind speed in September
London, Kiribati
- Average wind speed in September: 21.6km/h
The windiest month (with the highest average wind speed) is January (23.5km/h).
The calmest month (with the lowest average wind speed) is May (18.6km/h).
Average humidity in September
London, Kiribati
- Average humidity in September: 78%
The month with the highest relative humidity is March (84%).
The months with the lowest relative humidity are August, September, October and November (78%).
Average rainfall in September
London, Kiribati
- Average rainfall in September: 19mm
The wettest month (with the highest rainfall) is April (77mm).
The driest month (with the least rainfall) is October (9mm).
Average rainfall days in September
London, Kiribati
- Average rainfall days in September: 6.9 days
The month with the highest number of rainy days is April (22.1 days).
The month with the least rainy days is October (6.6 days).
Average sea temperature in September
London, Kiribati
- Average sea temperature in September: 27.8°C
The best months for swimming (with the highest average sea temperature) are June and July (28.3°C).
The coldest months (with the lowest average sea temperature) are January and February (26.7°C).
Average daylight in September /
Average sunshine in September
London, Kiribati
- Average daylight in September: 12h and 1min
The month with the longest days is June (Average daylight: 12h and 12min).
The month with the shortest days is December (Average daylight: 12h and 0min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is July (Average sunshine: 7h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 30min).
Average sunshine days in September
London, Kiribati
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is October (16.9 days).
The months with the least sunshine days are March and April (5.4 days).
Average UV index in September
London, Kiribati
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October and November (UV index 7).
The month with the lowest UV index is December (UV index 6).
Average cloud cover in September
London, Kiribati
- Average cloud cover in September: 40
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 39).
Average visibility in September
London, Kiribati
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
London, Kiribati
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