Today | Weather | Thursday, August 14, 2025

Weather in Costa Mesa, California

05:10 AM
Now
Cloudy WeatherCloudy weather, overcast skies with no rain.
64° F
Feels Like 64°
Precipitation 0 %
Wind 4 mph
Humidity 92 %
Today
Cloudy WeatherCloudy weather, overcast skies with clouds.
Day 73°
Night 64°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Costa Mesa Weather Forecast Updated

7 minutes ago
Last updated on

Weather Forecast History

Last Year's Weather on This Day (August 14, 2024)

Day

77°

Night

66°

Air quality in Costa Mesa

NOW
61 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 11.43 µg/m³
PM10 14.22 µg/m³
O₃ 21.71 ppb
NO₂ 6.04 ppb
SO₂ 0.96 ppb
CO 111.42 ppb
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.