Ontario
California, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Ontario, CA

A clear street near the luxurious residential estate in Ontario, California, with a scenic background of a hilly landscape, the clear blue sky
A clear street near the luxurious residential estate in Ontario, California, with a scenic background of a hilly landscape, the clear blue sky
January, the same as December, is another enjoyable winter month in Ontario, California, with average temperature fluctuating between 65.1°F (18.4°C) and 43.9°F (6.6°C). January is the coldest month, with an average high-temperature of 65.1°F (18.4°C) and an average low-temperature of 43.9°F (6.6°C). Weather in January »
The last month of the winter, February, is another comfortable month in Ontario, California, with temperature in the range of an average high of 65.8°F (18.8°C) and an average low of 45.3°F (7.4°C). In February, the average high-temperature is essentially the same as in January - a still enjoyable 65.8°F (18.8°C). Weather in February »

March, the first month of the spring, in Ontario, is a pleasant month, with average temperature fluctuating between 70°F (21.1°C) and 47.1°F (8.4°C). In March, the average high-temperature is practically the same as in February - an agreeable 70°F (21.1°C). Weather in March »

April in Ontario, California, is a moderately hot spring month, with average temperature varying between 50.5°F (10.3°C) and 73.9°F (23.3°C). In April, the average high-temperature is essentially the same as in March - a warm 73.9°F (23.3°C). Weather in April »

May, the last month of the spring, in Ontario, is also a moderately hot month, with average temperature varying between 79°F (26.1°C) and 55.6°F (13.1°C). In Ontario, the average high-temperature is relatively the same as in April - a still warm 79°F (26.1°C). Weather in May »

The first month of the summer, June, is still a warm month in Ontario, California, with average temperature varying between 59°F (15°C) and 85.5°F (29.7°C). In Ontario, the average high-temperature marginally rises, from a warm 79°F (26.1°C) in May, to a still moderately hot 85.5°F (29.7°C). Weather in June »

July is a hot summer month in Ontario, California, with average temperature ranging between max 92.1°F (33.4°C) and min 63.3°F (17.4°C). In Ontario, the average high-temperature in July marginally rises, from a warm 85.5°F (29.7°C) in June, to a hot 92.1°F (33.4°C). Weather in July »

August, the last month of the summer, in Ontario, is also a hot month, with average temperature fluctuating between 93.6°F (34.2°C) and 64.8°F (18.2°C). August is the warmest month, with an average high-temperature of 93.6°F (34.2°C) and an average low-temperature of 64.8°F (18.2°C). Weather in August »

The first month of the autumn, September, is still a hot month in Ontario, California, with temperature in the range of an average high of 89.1°F (31.7°C) and an average low of 62.6°F (17°C). In Ontario, the average high-temperature is practically the same as in August - a still tropical 89.1°F (31.7°C). Weather in September »

October, the same as September, is another warm autumn month in Ontario, California, with average temperature ranging between max 80.6°F (27°C) and min 55.2°F (12.9°C). In October, the average high-temperature slightly decreases, from a tropical 89.1°F (31.7°C) in September, to a warm 80.6°F (27°C). Weather in October »

The last month of the autumn, November, is another pleasant month in Ontario, California, with average temperature varying between 46.9°F (8.3°C) and 72.7°F (22.6°C). In November, the average high-temperature slightly decreases, from a moderately hot 80.6°F (27°C) in October, to a pleasant 72.7°F (22.6°C). Weather in November »

The first month of the winter, December, is still a comfortable month in Ontario, California, with temperature in the range of an average low of 42.6°F (5.9°C) and an average high of 65.7°F (18.7°C). In Ontario, the average high-temperature slightly decreases, from an agreeable 72.7°F (22.6°C) in November, to an enjoyable 65.7°F (18.7°C). Weather in December »

What is the coldest month in Ontario?

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

How much does it rain in Ontario?

Throughout the year, 15" (382mm) of rain is accumulated.

What is the wettest month in Ontario?

February is the month with the most rainfall, with 3.4" (86.1mm) of accumulated precipitation.

When are the longest days in Ontario?

The month with the longest days in Ontario, California, is June, with an average of 14.4h of daylight.

What is the driest month in Ontario?

The month with the least rainfall is July when 0.1" (2.3mm) of precipitation is typically aggregated.

What 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), August is the warmest month.

What is the month with the shortest days in Ontario?

With an average of 9.9h of daylight, December has the shortest days of the year in Ontario, California.
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).