Today | Weather | Tuesday, April 21, 2026

Weather in Chula Vista, California

04:21 PM
Now
Cloudy Weather
70° F
Feels Like 70°
Precipitation 0 %
Wind 12 mph
UV Index (0 - 11+) 4
Humidity 59 %
Today
Cloudy Weather
Day 70°
Night 57°
Precipitation 2 %
Wind 8 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Chula Vista Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 21, 2025)
Cloudy Weather

Day

66°

Night

55°

Wind

8 mph

UV Index

10

Precipitation

0 %

Air Quality in Chula Vista

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.59 µg/m³
PM10 8.33 µg/m³
O3 0.049 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.11 ppm
NH3 0 µg/m³
NO 0.01 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.52.59 µg/m³
PM108.33 µg/m³
O396.1 µg/m³
NO20.11 µg/m³
SO20.25 µg/m³
CO121.81 µg/m³
NH30 µg/m³
NO0.01 µg/m³