August weather forecast
London, United Kingdom

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The large Thames river overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom
The large Thames river overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom

Weather in August

August provides London with the tail-end of summer's warmth. The weather shows small variances from July, maintaining high temperatures and hours of sunlight. September's arrival ushers in the early signs of autumn, signified by cooler temperatures. Yet, August remains a remarkably good time for outdoor exploration and sightseeing. Even though it's summer, an average rainfall of 38mm (1.5") is noted, making August one of the wetter months of the year.

Temperature

The average high-temperature during August registers at a still agreeable 21.9°C (71.4°F), maintaining a close resemblance to the previous month. The average temperature drops to a moderate 13.8°C (56.8°F) during the night in the month of August.

Humidity

The least humid month is August, with an average relative humidity of 72%.

Rainfall

In London, in August, it is raining for 13.5 days, with typically 38mm (1.5") of accumulated precipitation. In London, United Kingdom, during the entire year, the rain falls for 151.7 days and collects up to 370mm (14.57") of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In London, the average length of the day in August is 14h and 33min.
On the first day of August, sunrise is at 5:25 am and sunset at 8:48 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 7:48 pm BST.

Sunshine

With an average of 7.9h of sunshine, August has the most sunshine of the year.

UV index

The average daily maximum UV index in August is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: A maximum high UV index of 4 in August translates into the following recommendations:
Be vigilant - Preventing sunburn is recommended. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
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Frequently asked questions

What are the temperatures in London in August?

In August, in London, the average high-temperature is 21.9°C (71.4°F), and the average low-temperature is 13.8°C (56.8°F).

What is the least humid month in London?

The least humid month in London, United Kingdom, is August, with an average relative humidity of 72%.

What is the average humidity in August in London?

In London, the average relative humidity in August is 72%.

How much does it rain in London in August?

In London, in August, it is raining for 13.5 days, with typically 38mm (1.5") of accumulated precipitation.

When it does not snow in London?

In London, snow does not fall in May through October.

What is the average length of the day in August in London?

In August, the average day length in London is 14h and 33min.

When are sunrise and sunset in August in London?

On the first day of August in London, United Kingdom, sunrise is at 5:25 am and sunset at 8:48 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 7:48 pm BST.

What month has the most sunshine in London?

With an average of 7.9h of sunshine, August has the most sunshine of the year in London.

How long on average sun shines in August in London?

In London, United Kingdom, the average sunshine duration in August is 7.9h.

What is the UV index reading in August in London?

In August, the average daily maximum UV index in London is 4. A UV Index reading of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
London, United Kingdom

Average temperature in August - London, United Kingdom
  • Average high temperature in August: 21.9°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 August: 13.8°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).

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Average pressure in August
London, United Kingdom

Average pressure in August - London, United Kingdom
  • Average pressure in August: 1014.9mbar

The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).

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Average wind speed in August
London, United Kingdom

Average wind speed in August - London, United Kingdom
  • Average wind speed in August: 12.8km/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).

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Average humidity in August
London, United Kingdom

Average humidity in August - London, United Kingdom
  • Average humidity in August: 72%

The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is August (72%).

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Average rainfall in August
London, United Kingdom

Average rainfall in August - London, United Kingdom
  • Average rainfall in August: 38mm

The wettest month (with the highest rainfall) is June (45mm).
The driest month (with the least rainfall) is April (22mm).

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Average rainfall days in August
London, United Kingdom

Average rainfall days in August - London, United Kingdom
  • Average rainfall days in August: 13.5 days

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is September (9.8 days).

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Average snowfall in August
London, United Kingdom

Average snowfall in August - London, United Kingdom
  • Average snowfall in August: 0mm

The month with the highest snowfall is February (16mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).

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Average snowfall days in August
London, United Kingdom

Average snowfall days in August - London, United Kingdom
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in August /
Average sunshine in August
London, United Kingdom

Average daylight in August / Average sunshine in August - London, United Kingdom
  • Average daylight in August: 14h 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 August: 7h and 5min

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).

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Average sunshine days in August
London, United Kingdom

Average sunshine days in August - London, United Kingdom
  • Average sunshine days in August: 15.5 days

The month with the most sunshine days is September (18.1 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in August
London, United Kingdom

Average UV index in August - London, United Kingdom
  • Average UV index in August: 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).

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Average cloud cover in August
London, United Kingdom

Average cloud cover in August - London, United Kingdom
  • Average cloud cover in August: 50

The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 49).

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Average visibility in August
London, United Kingdom

Average visibility in August - London, United Kingdom
  • Average visibility in August: 9km

The months with the highest visibility are January, February, March, April, May, June, July, August, October and December (9km).
The months with the lowest visibility are September and November (8km).

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London, United Kingdom

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