Today | Weather | Friday, September 5, 2025

Weather in Chula Vista, California

08:08 AM
Now
Cloudy Weather
70° F
Feels Like 72°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 5
Humidity 85 %
Today
Cloudy Weather
Day 79°
Night 64°
Precipitation 0 %
Wind 13
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:

Clouds yielding to sun with a twist.

Chula Vista Weather Forecast Updated

8 minutes ago
Last updated on

Weather Forecast History

Last Year's Weather on This Day (September 5, 2024)

Cloudy Weather

Day

88°

Night

70°

Wind

8 mph

UV Index

8

Precipitation

0

Air quality in Chula Vista

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

Pollutant Concentrations:

PM2.5 18.75 µg/m³
PM10 20.67 µg/m³
O₃ 11.98 ppb
NO₂ 16.27 ppb
SO₂ 1.37 ppb
CO 329.22 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.