Ontario climate

Typical historical weather for Ontario, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.

Want today's actual conditions instead? See the current forecast for Ontario.

Annual average

17.5°C

across all months

Warmest month

31.4°C

Aug average high

Coolest month

7.3°C

Jan average low

Annual rainfall

452mm

total per year

Monthly averages

Average daily high/low temperature (band) and monthly rainfall (bars).

● Avg high● Avg low▮ Rainfall

Records on file

Hottest day

43.6°C

5 September 2020

Coldest day

1.2°C

25 February 2022

Wettest day

75.9mm

5 February 2024

Windiest day

4.6m/s

22 February 2023