Today | Weather | Thursday, September 25, 2025

Weather in Chula Vista, California

12:14 PM

Now

73° F

Feels Like 79°

Precipitation 0 %

Wind 9 mph

UV Index (0 - 11+) 11

Humidity 70 %

Today

Day 75°

Night 64°

Precipitation 1 %

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.

Chula Vista Weather Forecast Updated

32 minutes ago

Last updated on September 25, 2025 11:42 AM

Weather Forecast History

Last Year's Weather on This Day (September 25, 2024)

Day

73°

Night

61°

Wind

6 mph

Precipitation

Air quality in Chula Vista

NOW

56 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 12.71 µg/m³

PM10 14.87 µg/m³

O₃ 31.68 ppb

NO₂ 7.39 ppb

SO₂ 1.23 ppb

CO 176.47 ppb

PM_2.5 – 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.

View Hourly Air Quality Forecast