September Weather in London

Last updated: March 2, 2024

The weather in London, Canada, during September is characterized by an average temperature of 17°C (64°F). Highs can soar to 29°C (85°F), while lows may dip to 5°C (41°F). Typically, the humidity level in London throughout September hovers around 81%.

5°C (41°F)

Minimum temperature

17°C (64°F)

Average temperature

29°C (85°F)

Maximum temperature

81%

Humidity

Precipitation and Sunshine hours

In September, London averages 86 mm (3.4 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 12 hours 26 minutes of daylight, with the sun shining for approximately 9 hours 45 minutes each day. Additionally, there is a 47% probability of sunny days during this period.

86 mm (3.4 inches)

Precipitation

11 rainy days

Rainy days

9 hours 45 minutes

Sunshine hours

47%

Chance of sun

UV Index

In September, the UV Index in London reaches a maximum of 8, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 1 2 3 5 7 8 7 6 4 3 1 1
Exposure Low Moderate High VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 25 min 30 min 45 min

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