Today | Weather | Thursday, August 21, 2025
Heat Advisory (Issued when high temperatures and humidity create conditions that may be hazardous during outdoor activity or prolonged exposure.)

Weather in Antioch, California

05:17 PM
Now
Cloudy WeatherCloudy weather, overcast skies with clouds.
100° F
Feels Like 99°
Precipitation 0 %
Wind 13 mph
UV Index (0 - 11+) 11
Humidity 19 %
Today
Cloudy WeatherCloudy weather, overcast skies with clouds.
Day 100°
Night 63°
Precipitation 0 %
Wind 7 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.

Other:

Sunny to partly overcast and hot; caution advised if outside for extended periods of time.

Antioch Weather Forecast Updated

13 minutes ago
Last updated on

Weather Forecast History

Last Year's Weather on This Day (August 21, 2024)

Day

84°

Night

61°

Air quality in Antioch

NOW
46 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 10.62 µg/m³
PM10 12.74 µg/m³
O₃ 66.75 ppb
NO₂ 3.13 ppb
SO₂ 1.82 ppb
CO 135.06 ppb
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors