Monthly weather forecast and climate
Costa Mesa, CA

January, like December, is a pleasant winter month in Costa Mesa, California, with temperature in the range of an average high of 70°F (21.1°C) and an average low of 46.9°F (8.3°C). The average high-temperature, in January, is 70°F (21.1°C), while the average low-temperature is 46.9°F (8.3°C). Weather in January »
The last month of the winter, February, is another pleasant month in Costa Mesa, California, with average temperature varying between 70°F (21.1°C) and 48°F (8.9°C). In Costa Mesa, the average high-temperature is 70°F (21.1°C), and the average low-temperature is 48°F (8.9°C). Weather in February »

March, the first month of the spring, in Costa Mesa, is also a pleasant month, with average temperature fluctuating between 72°F (22.2°C) and 50°F (10°C). In March, the average high-temperature is 72°F (22.2°C), and the average low-temperature is 50°F (10°C). Weather in March »

April is a warm spring month in Costa Mesa, California, with temperature in the range of an average high of 73.9°F (23.3°C) and an average low of 53.1°F (11.7°C). In April, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 53.1°F (11.7°C). Weather in April »

The last month of the spring, May, is also a warm month in Costa Mesa, California, with average temperature varying between 57°F (13.9°C) and 75.9°F (24.4°C). In Costa Mesa, California, in May, the average high-temperature is 75.9°F (24.4°C), and the average low-temperature is 57°F (13.9°C). Weather in May »

June, the first month of the summer, in Costa Mesa, is also a warm month, with average temperature ranging between max. 78.1°F (25.6°C) and min. 60.1°F (15.6°C). The average high-temperature, in June, is 78.1°F (25.6°C), while the average low-temperature is 60.1°F (15.6°C). Weather in June »

July, like June, in Costa Mesa, California, is another warm summer month, with average temperature fluctuating between 63°F (17.2°C) and 82.9°F (28.3°C). The average high-temperature, in July, is 82.9°F (28.3°C), while the average low-temperature is 63°F (17.2°C). Weather in July »

The last month of the summer, August, is another warm month in Costa Mesa, California, with average temperature ranging between min. 64°F (17.8°C) and max. 84.9°F (29.4°C). With an average high-temperature of 84.9°F (29.4°C) and an average low-temperature of 64°F (17.8°C), August is the warmest month. Weather in August »

The first month of the autumn, September, is still a warm month in Costa Mesa, California, with average temperature fluctuating between 62.1°F (16.7°C) and 84°F (28.9°C). In Costa Mesa, the average high-temperature is 84°F (28.9°C), and the average low-temperature is 62.1°F (16.7°C). Weather in September »

October, like September, in Costa Mesa, California, is a warm autumn month, with average temperature varying between 57.9°F (14.4°C) and 80.1°F (26.7°C). The average high-temperature, in October, is 80.1°F (26.7°C), while the average low-temperature is 57.9°F (14.4°C). Weather in October »

The last month of the autumn, November, is also a warm month in Costa Mesa, California, with average temperature fluctuating between 73.9°F (23.3°C) and 51.1°F (10.6°C). In November, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 51.1°F (10.6°C). Weather in November »

December, the first month of the winter, in Costa Mesa, is still a pleasant month, with temperature in the range of an average high of 69.1°F (20.6°C) and an average low of 46.9°F (8.3°C). With an average high-temperature of 69.1°F (20.6°C) and an average low-temperature of 46.9°F (8.3°C), December is the coldest month. Weather in December »

How much does it rain in Costa Mesa?

Throughout the year, 10.7" (272.1mm) of rain is accumulated.

What is the rainiest month in Costa Mesa?

The month with the most rainfall in Costa Mesa, California, is February when 2.7" (68.1mm) of precipitation is typically aggregated.

When are the longest days in Costa Mesa?

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

What is the driest month in Costa Mesa?

Months with the least rainfall are July and August with 0" (0.5mm) of accumulated rain.

What is the warmest month in Costa Mesa?

August is the warmest month in Costa Mesa, California, with an average high-temperature of 84.9°F (29.4°C) and an average low-temperature of 64°F (17.8°C).

What is the coldest month in Costa Mesa?

December is the coldest month in Costa Mesa, California, with an average high-temperature of 69.1°F (20.6°C) and an average low-temperature of 46.9°F (8.3°C).

What is the month with the shortest days in Costa Mesa?

With an average of 10h of daylight, December has the shortest days of the year.
Average rainfall - Costa Mesa, CA
Average daylight - Costa Mesa, CA

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 10h).

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