London, Ontario Weather by Month and Climate Averages

How much rain does London get?

London gets 928 mm of precipitation in an average year, spread over about 166 days with measurable rain. That is more rainy days than 84% of Canada.

May is the wettest month, with 88 mm. February is the driest, with 67 mm. January has the most rainy days, about 20.

The longest dry spell in the last five years lasted 15 days, to February 14, 2024.

London weather by month

London weather in January

In January, London averages a high of -2°C and a low of -9°C. It gets 74 mm of precipitation over about 20 rainy days. The sun is out about 14% of daylight hours. The January record high is 15°C (2008) and the record low is -27°C (2005).

London weather in February

In February, London averages a high of -1°C and a low of -9°C. It gets 67 mm of precipitation over about 16 rainy days. The sun is out about 28% of daylight hours. The February record high is 18°C (2017) and the record low is -29°C (2015).

London weather in March

In March, London averages a high of 5°C and a low of -4°C. It gets 67 mm of precipitation over about 15 rainy days. The sun is out about 32% of daylight hours. The March record high is 27°C (2012) and the record low is -26°C (2003).

London weather in April

In April, London averages a high of 13°C and a low of 2°C. It gets 79 mm of precipitation over about 13 rainy days. The sun is out about 36% of daylight hours. The April record high is 27°C (2023) and the record low is -12°C (2003).

London weather in May

In May, London averages a high of 19°C and a low of 8°C. It gets 88 mm of precipitation over about 13 rainy days. The sun is out about 42% of daylight hours. The May record high is 33°C (2006) and the record low is -3°C (2020).

London weather in June

In June, London averages a high of 24°C and a low of 13°C. It gets 83 mm of precipitation over about 11 rainy days. The sun is out about 48% of daylight hours. The June record high is 33°C (2025) and the record low is 2°C (2025). June is one of the most comfortable months to visit.

London weather in July

In July, London averages a high of 27°C and a low of 16°C. It gets 78 mm of precipitation over about 12 rainy days. The sun is out about 49% of daylight hours. The July record high is 37°C (2011) and the record low is 7°C (2010).

London weather in August

In August, London averages a high of 26°C and a low of 14°C. It gets 77 mm of precipitation over about 10 rainy days. The sun is out about 49% of daylight hours. The August record high is 34°C (2012) and the record low is 6°C (2025). August is one of the most comfortable months to visit.

London weather in September

In September, London averages a high of 22°C and a low of 11°C. It gets 78 mm of precipitation over about 10 rainy days. The sun is out about 49% of daylight hours. The September record high is 34°C (2013) and the record low is 0°C (2020). September is one of the most comfortable months to visit.

London weather in October

In October, London averages a high of 15°C and a low of 5°C. It gets 82 mm of precipitation over about 15 rainy days. The sun is out about 38% of daylight hours. The October record high is 31°C (2007) and the record low is -5°C (2002).

London weather in November

In November, London averages a high of 8°C and a low of 0°C. It gets 79 mm of precipitation over about 14 rainy days. The sun is out about 34% of daylight hours. The November record high is 22°C (2015) and the record low is -13°C (2008).

London weather in December

In December, London averages a high of 2°C and a low of -5°C. It gets 77 mm of precipitation over about 18 rainy days. The sun is out about 17% of daylight hours. The December record high is 16°C (2021) and the record low is -24°C (2017).

Sunshine, humidity and wind in London

July is the sunniest month in London, with sunshine about 49% of daylight hours. January is the cloudiest, at 14%. Over the year the sun shines about 36% of daylight hours. London is sunnier than 51% of Canada.

Humidity peaks in January at 80% and is lowest in May at 60%.

London has about 4 days a year above 32°C. London is hotter than 55% of Canada.

First and last freeze in London

The first fall freeze in London typically comes around October 20, and the last spring freeze around May 1. That leaves a frost-free growing season of about 172 days.

London weather records

The hottest temperature on record at the London station is 37°C, on July 21, 2011. The coldest is -29°C, on February 16, 2015.

The wettest day on record brought 80 mm of rain, on July 2, 2023.

The best time to visit London

The most comfortable time to visit is typically June and August to September, when daytime highs sit near 24°C.

Winter (December–February) is cold, with average highs around 0°C and lows near -8°C.

Spring (March–May) is chilly, with average highs around 12°C and lows near 2°C.

Summer (June–August) is warm, with average highs around 26°C and lows near 14°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 15°C and lows near 5°C.

London climate questions

How much rain does London get?

London gets 928 mm of precipitation in an average year, over about 166 rainy days.

What is the wettest month in London?

May is the wettest month in London, with 88 mm. February is the driest, with 67 mm.

How many rainy days does London have a year?

London has about 166 days with measurable rain in an average year. January has the most, about 20.

What is the hottest month in London?

July is the warmest month in London, with an average high of 27°C.

What is the coldest month in London?

February is the coldest month in London, with an average low of -9°C.

What is the record high temperature in London?

The record high at the London station is 37°C, set on July 21, 2011. The record low is -29°C, on February 16, 2015.

What is the sunniest month in London?

July is the sunniest month in London, with sunshine about 49% of daylight hours. January is the cloudiest.

When is the first frost in London?

The first fall freeze in London typically comes around October 20. The last spring freeze is around May 1.

What is the best time to visit London?

The most comfortable time to visit is typically June and August to September, when daytime highs sit near 24°C.