Costa Mesa
California, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Costa Mesa, CA

January, like December, in Costa Mesa, California, is another comfortable winter month, with temperature in the range of an average low of 53.6°F (12°C) and an average high of 64.4°F (18°C). In January, the average high-temperature is relatively the same as in December - a still comfortable 64.4°F (18°C). Weather in January »

The last month of the winter, February, is another comfortable month in Costa Mesa, California, with average temperature fluctuating between 52.3°F (11.3°C) and 63.3°F (17.4°C). In Costa Mesa, the average high-temperature is almost the same as in January - a still enjoyable 63.3°F (17.4°C). Weather in February »

The first month of the spring, March, is also an enjoyable month in Costa Mesa, California, with average temperature varying between 64.8°F (18.2°C) and 53.4°F (11.9°C). In Costa Mesa, California, the average high-temperature in March is relatively the same as in February - a still enjoyable 64.8°F (18.2°C). Weather in March »

April, like March, in Costa Mesa, California, is another comfortable spring month, with average temperature fluctuating between 54.9°F (12.7°C) and 66.6°F (19.2°C). In April, the average high-temperature is practically the same as in March - a still comfortable 66.6°F (19.2°C). Weather in April »

May, the last month of the spring, in Costa Mesa, is also an enjoyable month, with average temperature varying between 56.8°F (13.8°C) and 67.6°F (19.8°C). In May, the average high-temperature is practically the same as in April - a still enjoyable 67.6°F (19.8°C). Weather in May »

June, the first month of the summer, in Costa Mesa, is an agreeable month, with temperature in the range of an average low of 58.6°F (14.8°C) and an average high of 70.7°F (21.5°C). In June, the average high-temperature is almost the same as in May - an agreeable 70.7°F (21.5°C). Weather in June »

July is a moderately hot summer month in Costa Mesa, California, with average temperature fluctuating between 63.5°F (17.5°C) and 75°F (23.9°C). In July, the average high-temperature is essentially the same as in June - a moderately hot 75°F (23.9°C). Weather in July »

The last month of the summer, August, is also a moderately hot month in Costa Mesa, California, with average temperature varying between 64.9°F (18.3°C) and 76.6°F (24.8°C). August is the warmest month, with an average high-temperature of 76.6°F (24.8°C) and an average low-temperature of 64.9°F (18.3°C). Weather in August »

September, the first month of the autumn, in Costa Mesa, is also a moderately hot month, with average temperature ranging between min 64.2°F (17.9°C) and max 76.1°F (24.5°C). In Costa Mesa, the average high-temperature is practically the same as in August - a still warm 76.1°F (24.5°C). Weather in September »

October, the same as September, in Costa Mesa, California, is an agreeable autumn month, with average temperature ranging between max 73°F (22.8°C) and min 62.1°F (16.7°C). In Costa Mesa, the average high-temperature in October is practically the same as in September - an agreeable 73°F (22.8°C). Weather in October »

November, the last month of the autumn, in Costa Mesa, is another pleasant month, with average temperature ranging between min 57.9°F (14.4°C) and max 68.5°F (20.3°C). In Costa Mesa, the average high-temperature is practically the same as in October - a still agreeable 68.5°F (20.3°C). Weather in November »

The first month of the winter, December, is still a comfortable month in Costa Mesa, California, with average temperature varying between 53.1°F (11.7°C) and 62.4°F (16.9°C). With an average high-temperature of 62.4°F (16.9°C) and an average low-temperature of 53.1°F (11.7°C), December is the coldest month. Weather in December »

How many days does it rain in Costa Mesa?

In Costa Mesa, during the entire year, the rain falls for 50.7 days and collects up to 3.74" (95mm) of precipitation.

What are the months with the lowest UV index in Costa Mesa?

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index.

What is the most humid month in Costa Mesa?

The most humid month in Costa Mesa, California, is June, with an average relative humidity of 74%.

What is the driest month in Costa Mesa?

June is the month with the least rainfall. Rain falls for 1.6 days and accumulates 0.04" (1mm) of precipitation.

When are the longest days in Costa Mesa?

June has the longest days of the year, with an average of 14.4h of daylight.

What is the month with the highest UV index in Costa Mesa?

Months with the highest UV index are July through September, with an average maximum UV index of 6.

What is the warmest month in Costa Mesa?

August is the warmest month in Costa Mesa, California, with an average high-temperature of 76.6°F (24.8°C) and an average low-temperature of 64.9°F (18.3°C).

What month has the most sunshine in Costa Mesa?

The month with the most sunshine is August, with an average of 12h of sunshine.

What is the least humid month in Costa Mesa?

The least humid month in Costa Mesa, California, is November, with an average relative humidity of 59%.

What is the coldest month in Costa Mesa?

December is the coldest month, with an average high-temperature of 62.4°F (16.9°C) and an average low-temperature of 53.1°F (11.7°C).

What is the rainiest month in Costa Mesa?

December is the month with the most rainfall in Costa Mesa, California. Rain falls for 6.2 days and accumulates 0.79" (20mm) of precipitation.

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 in Costa Mesa, California.

What is the month with the least sunshine in Costa Mesa?

December has the least sunshine of the year in Costa Mesa, with an average of 6.6h of sunshine.
Average temperature - Costa Mesa, CA
Average rainfall - Costa Mesa, CA

The wettest month (with the highest rainfall) is December (0.79").
The driest month (with the lowest rainfall) is June (0.04").

Average rainfall days - Costa Mesa, CA

The month with the highest number of rainy days is March (6.6 days).
The month with the lowest number of rainy days is June (1.6 days).

Average daylight / Average sunshine - Costa Mesa, CA
Average UV index - Costa Mesa, CA

Months with the highest UV index are July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).