Monthly weather forecast and climate
Ontario, CA

What is the coldest month in Ontario?

With an average high-temperature of 65.1°F (18.4°C) and an average low-temperature of 43.9°F (6.6°C), January is the coldest month in Ontario, California.

How much does it rain in Ontario?

During the entire year, Ontario aggregates up to 15" (382mm) of precipitation.

What is the rainiest month in Ontario?

The month with the most rainfall is February when 3.4" (86.1mm) of precipitation is typically aggregated.

What is the driest month in Ontario?

July is the month with the least rainfall, with 0.1" (2.3mm) of accumulated precipitation.

What is the warmest month in Ontario?

August is the warmest month in Ontario, with an average high-temperature of 93.6°F (34.2°C) and an average low-temperature of 64.8°F (18.2°C).
Average temperature - Ontario, CA
Average rainfall - Ontario, CA

The wettest month (with the highest rainfall) is February (3.4").
Driest months (with the lowest rainfall) are June, July and August (0.1").

Average daylight - Ontario, CA

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).