Weather Forecast and Radar for Ontario, California

Weather in Ontario, CA

Ontario, California is a city in the Inland Empire region of Southern California, located approximately 38 miles east of Los Angeles. Ontario's warm, Mediterranean climate features hot, dry summers and mild, wet winters.

In the summertime, temperatures usually range between 70-95°F (21-35°C). July and August are the hottest months, with temperatures often reaching into the high 90s (35°C) during the day and low 70s (21°C) at night.

During the winter, temperatures range from 40-70°F (4-21°C). December and January are the coldest months, with temperatures commonly dipping into the low 40s (4°C) during the day and low 30s (0°C) at night.

Spring and fall are mild and temperate, with temperatures typically ranging from the low 50s (10°C) to the low 80s (27°C). Rainfall is common during these transitional seasons.

On average, Ontario receives 10-15 inches (25-38 cm) of precipitation annually, with most of it falling during the cooler months. Snow is rare, but can occur in the winter months.

Fast Facts About Ontario, CA

As of 2020, the city population is 178194.

Major Cities Nearby Ontario, CA

This map shows the current & 7-day weather forecast, weather alerts, and weather radar for Ontario, California.