London, Ontario, Canada climate
Average temperatures, precipitation and all-time records for London, Ontario, Canada, with every day graded against ~45 years of local climate history (1981–2026). Its warmest month is July, averaging a high of 28°C, and its coldest is January, with an average low of -9°C.
London is a city in southwestern Ontario, Canada, along the Quebec City–Windsor Corridor. The city had a population of 422,324 according to the 2021 Canadian census. via Wikipedia
How today compares
Latest recorded day: 2026-07-21. Each reading placed on London, Ontario, Canada's own ±7-day seasonal distribution.
London average temperatures by month
Typical daily high and low, and average precipitation, for each month in London, Ontario, Canada, based on 1981–2026 records. The wettest month is January (3 mm on an average day).
| Month | Avg high | Avg low | Avg precip |
|---|---|---|---|
| January | -2°C | -9°C | 3 mm |
| February | -1°C | -8°C | 3 mm |
| March | 5°C | -4°C | 3 mm |
| April | 12°C | 1°C | 3 mm |
| May | 19°C | 7°C | 3 mm |
| June | 25°C | 13°C | 3 mm |
| July | 28°C | 17°C | 3 mm |
| August | 27°C | 16°C | 3 mm |
| September | 23°C | 12°C | 3 mm |
| October | 15°C | 6°C | 3 mm |
| November | 8°C | 0°C | 3 mm |
| December | 1°C | -5°C | 3 mm |
Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -23°C to 46°C scale, so the whole year's rhythm reads at a glance.
Thinking of visiting London?
Trips live and die by the weather. See how London's comfort stacks up against where you live. London is pre-loaded, just add your city.
Record extremes
- Hottest day on record: 37°C on 1988-07-06
- Coldest day on record: -28°C on 1982-01-17
Percentiles compare each day to London, Ontario, Canada's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →