August Weather in London, Canada

Last updated: June 18, 2025

In August, the average temperature in London, Canada hovers around 21°C (70°F). Expect a minimum of 6°C (43°F) and a maximum of 31°C (89°F), creating a pleasantly warm atmosphere. However, be prepared for 108 mm (4.2 in) of precipitation spread over 12 days and an average humidity of 80%, ensuring the air feels comfortably moist.

August Temperature in London

In August in London, the average temperature is 21°C (70°F). Maximums can reach 31°C (89°F), while minimums can dip as low as 6°C (43°F). This makes London an ideal destination for travelers seeking a comfortable climate.

August Weather in London: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in London, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In London, August typically has an average temperature of 21°C (70°F), with highs reaching up to 31°C (89°F) and lows dropping to around 6°C (43°F).

Data source: Temperature data for London generated using information from the Copernicus Climate Change Service.

August Precipitation in London

In London in August, the total precipitation amount is 108 mm (4.2 in) spread over 12 days.

August Precipitation Trends in London

The chart displays monthly precipitation patterns in London, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In London, August typically receives around 108 mm (4.2 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

August Humidity in London

In London in August humidity is 80%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can make even short walks feel draining, urging travelers to seek shade or a cool drink frequently.

August Average Humidity in London

This chart illustrates the average monthly humidity levels in London, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in London is approximately 80%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in London

In London in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in London.

Maximum UV Index Levels in London for August

The chart shows the monthly maximum UV Index (UVI) for London in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in London typically reaches 9, which falls under the very high exposure category.

Data source: London August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How August Weather in London Compares to Other Months

Weather in London varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in London, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in London, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	74 mm (2.9 inches)	90%	low
February Weather	-3°C (26°F)	78 mm (3.1 inches)	90%	moderate
March Weather	1°C (34°F)	78 mm (3.1 inches)	87%	moderate
April Weather	7°C (44°F)	105 mm (4.1 inches)	87%	very high
May Weather	14°C (57°F)	104 mm (4.1 inches)	82%	very high
June Weather	19°C (67°F)	105 mm (4.1 inches)	81%	very high
July Weather	22°C (72°F)	97 mm (3.8 inches)	79%	very high
August Weather	21°C (70°F)	108 mm (4.2 inches)	80%	very high
September Weather	17°C (64°F)	86 mm (3.4 inches)	81%	very high
October Weather	11°C (53°F)	124 mm (4.9 inches)	84%	moderate
November Weather	3°C (38°F)	91 mm (3.6 inches)	88%	moderate
December Weather	0°C (31°F)	72 mm (2.8 inches)	87%	low