Climate and monthly weather forecast
Costa Mesa, CA

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Weather in January

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). Costa Mesa starts January with an average high-temperature of a still comfortable 64.4°F (18°C), hinting at a minimal fluctuation from December. Weather in January »

Weather in February

February, the last month of the winter in Costa Mesa, is another comfortable month, with an average temperature ranging between max 63.3°F (17.4°C) and min 52.3°F (11.3°C). February welcomes an average high-temperature of a still comfortable 63.3°F (17.4°C), not much different from the preceding month. Weather in February »

Weather in March

The first month of the spring, March, is also an enjoyable month in Costa Mesa, California, with temperature in the range of an average low of 53.4°F (11.9°C) and an average high of 64.8°F (18.2°C). On the advent of March, Costa Mesa's average high-temperature exhibits a minor adjustment to a still comfortable 64.8°F (18.2°C) from February's 63.3°F (17.4°C). Weather in March »

Weather in April

April, the same as March, is another comfortable spring month in Costa Mesa, California, with an average temperature varying between 66.6°F (19.2°C) and 54.9°F (12.7°C). The high-temperature average in April for Costa Mesa is a still enjoyable 66.6°F (19.2°C), staying closely aligned with March's conditions. Weather in April »

Weather in May

The last month of the spring, May, is another comfortable month in Costa Mesa, California, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 67.6°F (19.8°C). Costa Mesa experiences a transition to a still comfortable 67.6°F (19.8°C) in average high-temperatures with the arrival of May, not greatly differing from April's 66.6°F (19.2°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Costa Mesa, California, with an average temperature ranging between max 70.7°F (21.5°C) and min 58.6°F (14.8°C). The transition into June marks the average high-temperature at a pleasant 70.7°F (21.5°C), differing minimally from May's 67.6°F (19.8°C). Weather in June »

Weather in July

July in Costa Mesa, California, is a warm summer month, with temperature in the range of an average high of 75°F (23.9°C) and an average low of 63.5°F (17.5°C). Costa Mesa records an average high-temperature of a moderately hot 75°F (23.9°C) in July, closely mirroring the climate of the previous month. Weather in July »

Weather in August

August, the last month of the summer in Costa Mesa, is also a moderately hot month, with an average temperature fluctuating between 64.9°F (18.3°C) and 76.6°F (24.8°C). The highest temperatures are recorded in August, with averages reaching a high of 76.6°F (24.8°C) and a low of 64.9°F (18.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Costa Mesa, California, with an average temperature ranging between max 76.1°F (24.5°C) and min 64.2°F (17.9°C). Costa Mesa ushers in September with an average high-temperature of a still moderately hot 76.1°F (24.5°C), showing a close resemblance to the previous month. Weather in September »

Weather in October

October, like September, is an agreeable autumn month in Costa Mesa, California, with an average temperature ranging between min 62.1°F (16.7°C) and max 73°F (22.8°C). The onset of October marks an average high-temperature of a pleasant 73°F (22.8°C), hardly differing from September's 76.1°F (24.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Costa Mesa, is also an agreeable month, with an average temperature varying between 68.5°F (20.3°C) and 57.9°F (14.4°C). Costa Mesa's average high-temperature in November is a still pleasant 68.5°F (20.3°C), indicating a subtle variation from October. Weather in November »

Weather in December

December, the first month of the winter in Costa Mesa, is also an enjoyable month, with an average temperature fluctuating between 53.1°F (11.7°C) and 62.4°F (16.9°C). The lowest temperatures are recorded in December, with averages reaching a high of 62.4°F (16.9°C) and a low of 53.1°F (11.7°C). Weather in December »
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Frequently asked questions

How much does it rain in Costa Mesa?

Throughout the year, there are 50.7 rainfall days, and 3.74" (95mm) of precipitation is accumulated.

When is 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.

When is Daylight Saving Time (DST) in Costa Mesa?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.

What is the most humid month in Costa Mesa?

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

What is the driest month in Costa Mesa?

The month with the least rainfall is June, when the rain falls for 1.6 days and typically collects 0.04" (1mm) of precipitation.

When are the longest days in Costa Mesa?

With an average of 14h and 24min of daylight, June has the longest days of the year in Costa Mesa.

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

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

What is the warmest month in Costa Mesa?

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

What month has the most sunshine in Costa Mesa?

August has the most sunshine of the year in Costa Mesa, 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 month is the coldest in Costa Mesa?

The lowest temperatures in Costa Mesa are recorded in December, with averages reaching a high of 62.4°F (16.9°C) and a low of 53.1°F (11.7°C).

What is the wettest month in Costa Mesa?

The month with the most rainfall is December, when the rain falls for 6.2 days and typically aggregates up to 0.79" (20mm) of precipitation.

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

December has the shortest days of the year, with an average of 10h and 0min of daylight.

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

The month with the least sunshine in Costa Mesa is December, with an average of 6.6h of sunshine.

Average temperature
Costa Mesa, CA

Average temperature - Costa Mesa, CA

The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (62.4°F).

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (52.3°F).

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Average pressure
Costa Mesa, CA

Average pressure - Costa Mesa, CA

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.89"Hg).

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Average wind speed
Costa Mesa, CA

Average wind speed - Costa Mesa, CA

The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is October (5.2mph).

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Average rainfall
Costa Mesa, CA

Average rainfall - Costa Mesa, CA

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

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Average rainfall days
Costa Mesa, CA

Average rainfall days - Costa Mesa, CA

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

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Average daylight / Average sunshine
Costa Mesa, CA

Average daylight / Average sunshine - Costa Mesa, CA

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

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Average sunshine days
Costa Mesa, CA

Average sunshine days - Costa Mesa, CA

The month with the most sunshine days is June (26.5 days).
The month with the least sunshine days is February (20.5 days).

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Average UV index
Costa Mesa, CA

Average UV index - Costa Mesa, CA

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

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Average visibility
Costa Mesa, CA

Average visibility - Costa Mesa, CA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Costa Mesa, California, USA

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