London (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit London.
Climate overview of London
London, Ontario, Canada, experiences significant temperature variation throughout the year. Summers bring daytime highs of 27°C (81°F) in July, while winters cool to 0°C (32°F) in January.
The city receives considerable rain/snowfall, with around 1073 mm (42 in) annually. June is the wettest month. It has warm summers and very cold winters.
London Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in London - and find the best time to visit.
Monthly Temperature in London
Depending on the time of the year, temperatures range from comfortable to very cold in London. Typically, average maximum daytime temperatures range from a comfortable 27°C (81°F) in July to a very cold 0°C (32°F) in the coolest month, January.
Nights vary from 16°C (61°F) in July to around -9°C (16°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in London
London has a relatively rain/snowy climate with high precipitation levels, averaging 1073 mm (42 in) of rain/snowfall annually. Precipitation levels in London remain relatively steady throughout the year. June has the most rain, with 110 mm (4.3 in) over 11 days. In the driest month February, this drops slightly to 71 mm (2.8 in), making the city's climate fairly predictable. For more details, please visit our London Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit London
Each month is rated for comfortable sightseeing weather — mild temperatures and low rainfall. Tap a month for its full averages; your ideal time may differ for a beach or winter trip (see below).
- Best overall: August and September
- Warmest weather: July and August
- Fewer rainy days: May, June, July, August and September
- Climate seasons: warm summers and very cold winters
- Best for winter weather: January, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in London
What is the best time to visit London?
August and September typically offer the most optimal weather in London. In contrast, January, February, March, April, November and December tend to have less optimal conditions. London has warm summers and very cold winters.
What temperatures can I expect in London?
Daytime highs range from 0°C (32°F) in January to 27°C (81°F) in July. Nighttime lows range from -9°C (16°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does London get?
Annual rainfall is around 1073 mm (42 in). June is the wettest month with 110 mm (4.3 in), while February is the driest with 71 mm (2.8 in).
London 3-Day Forecast
London (ON) 3-Day Forecast
London on the map
London is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Niagara Falls
27°C (81°F) Montréal28°C (82°F) Ottawa27°C (81°F) Quebec City
26°C (79°F) Toronto26°C (79°F) Calgary24°C (75°F) Vancouver22°C (72°F) Whistler
19°C (66°F) 
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
The 5 most beautiful lakes in Canada
Explore Canada's stunning lakes: Lake Louise, Lake Superior, Maligne Lake, Emerald Lake, and Lake Okanagan, each offering unique beauty and activities.
Canoeing the south Nahannii
The South Nahanni in the northwest of Canada is one of the most impressive wilderness rivers in the world. Canoeing the south Nahanni is something you must add to your bucket list.
See Polar Bears in Churchill Canada
Thousands of bears gather at the small town of Churchill. In the evening the northern lights give a light show against the dark evening sky. An unforgettable experience.
Banff National Park
Snowy mountains, clear blue lakes and green forests make Banff National Park a wonderful bucket list destination. The pristine wilderness is a mecca for walkers.