Today | Weather | Saturday, September 19, 2026

Weather in Chula Vista, California

01:47 AM
Now
Night
66° F
Feels Like 64°
Precipitation 0 %
Wind 5 mph
Humidity 84 %
Today
Cloudy Weather
Day 79°
Night 64°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 7

Chula Vista Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 19, 2025)
Cloudy Night

Day

79°

Night

66°

Wind

5 mph

Precipitation

1 %

Air Quality in Chula Vista

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.98 µg/m³
PM10 20.94 µg/m³
O3 0.048 ppm
NO2 0.2 ppb
SO2 0.2 ppb
CO 0.12 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.56.98 µg/m³
PM1020.94 µg/m³
O394.68 µg/m³
NO20.32 µg/m³
SO20.53 µg/m³
CO142.99 µg/m³
NH30 µg/m³
NO0 µg/m³