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Today | Weather | Tuesday, October 21, 2025

Weather in Antioch, California

07:13 PM
Now
Cloudy Night
73° F
Feels Like 72°
Precipitation 0 %
Wind 7 mph
Humidity 46 %
Today
Sunny Weather
Day 79°
Night 61°
Precipitation 0 %
Wind 5 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.

Antioch Weather Forecast Updated

54 minutes ago
Last updated on

Weather Forecast History

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

Cloudy Night

Day

79°

Night

52°

Wind

6 mph

Precipitation

0

Air Quality in Antioch

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

Pollutant Concentrations:

PM2.5 12.31 µg/m³
PM10 24.84 µg/m³
O3 0.046 ppm
NO2 1.1 ppb
SO2 0.5 ppb
CO 0.10 ppm
NH3 0 µg/m³
NO 0 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.5 – 12.31 µg/m³
PM10 – 24.84 µg/m³
O3 – 91.16 µg/m³
NO2 – 2.15 µg/m³
SO2 – 1.27 µg/m³
CO – 113.55 µg/m³
NH3 – 0 µg/m³
NO – 0 µg/m³
View Hourly Air Quality Forecast