August weather forecastCosta Mesa, CA
August
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).Temperature
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).Humidity
In Costa Mesa, the average relative humidity in August is 70%.Rainfall
In Costa Mesa, during August, the rain falls for 2.8 days and regularly aggregates up to 0.2" (5mm) of precipitation. In Costa Mesa, during the entire year, the rain falls for 50.7 days and collects up to 3.74" (95mm) of precipitation.Daylight
The average length of the day in August is 13h and 22min.On the first day of the month, sunrise is at 6:04 am and sunset at 7:51 pm. On the last day of August, sunrise is at 6:25 am and sunset at 7:17 pm PDT.
Sunshine
August has the most sunshine of the year, with an average of 12h of sunshine.UV index
The months with the highest UV index in Costa Mesa are July through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: A daily high UV index of 6 in August leads to these guidelines:
Resist overexposure. Safeguarding from solar damage is indispensable. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Costa Mesa, CA
- Average high temperature in August: 76.6°F
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).
- Average low temperature in August: 64.9°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).
Average pressure in August
Costa Mesa, CA
- Average pressure in August: 29.9"Hg
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).
Average wind speed in August
Costa Mesa, CA
- Average wind speed in August: 5.3mph
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).
Average humidity in August
Costa Mesa, CA
- Average humidity in August: 70%
The month with the highest relative humidity is June (74%).
The month with the lowest relative humidity is November (59%).
Average rainfall in August
Costa Mesa, CA
- Average rainfall in August: 0.2"
The wettest month (with the highest rainfall) is December (0.79").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in August
Costa Mesa, CA
- Average rainfall days in August: 2.8 days
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).
Average daylight in August /
Average sunshine in August
Costa Mesa, CA
- Average daylight in August: 13h and 24min
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).
- Average sunshine in August: 12h 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).
Average sunshine days in August
Costa Mesa, CA
- Average sunshine days in August: 25.8 days
The month with the most sunshine days is June (26.5 days).
The month with the least sunshine days is February (20.5 days).
Average UV index in August
Costa Mesa, CA
- Average UV index in August: 6
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).
Average cloud cover in August
Costa Mesa, CA
- Average cloud cover in August: 8
The months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in August
Costa Mesa, CA
- Average visibility in August: 6mi
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).
