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Today | Weather | Thursday, December 4, 2025
Active Weather Warnings

Weather in Chula Vista, California

01:30 AM
Now
Cloudy Night
48° F
Feels Like 48°
Precipitation 0 %
Wind 5 mph
Humidity 63 %
Today
Cloudy Weather
Day 72°
Night 45°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 3

Chula Vista Weather Forecast Updated

6 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 4, 2024)
Cloudy Night

Day

61°

Night

46°

Wind

4 mph

Precipitation

0 %

Air Quality in Chula Vista

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

Pollutant Concentrations:

PM2.5 13.24 µg/m³
PM10 21.81 µg/m³
O3 0.055 ppm
NO2 0.6 ppb
SO2 0.3 ppb
CO 0.15 ppm
NH3 0.22 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 – 13.24 µg/m³
PM10 – 21.81 µg/m³
O3 – 107.7 µg/m³
NO2 – 1.11 µg/m³
SO2 – 0.82 µg/m³
CO – 166.28 µg/m³
NH3 – 0.22 µg/m³
NO – 0 µg/m³
View Hourly Air Quality Forecast

Weather Alerts and Warnings for Chula Vista

Moderate Expected Likely

Beach Hazards Statement

Beach Hazards Statement issued December 4 at 1:14AM PST until December 5 at 10:00AM PST by NWS San Diego CA
Dec 4, 1:14 AM → Dec 5, 10:00 AM
WHAT: Very high astronomical tides during the mornings combined
with elevated surf up to 5 feet, primarily at west-facing
beaches today, will result in minor tidal overflow and local
beach flooding.

WHERE: San Diego County Coastal Areas and Orange County
Coastal Areas.

WHEN: Through Friday morning.

IMPACTS: Minor tidal overflow, beach flooding, and coastal
erosion most likely during times of high tides. Hazardous
swimming conditions.

ADDITIONAL DETAILS: Predicted high tides at La Jolla: 7.1 feet
at 734 AM today, and 7.1 feet at 818 AM Friday.
+ Read More
A beach hazards statement for minor tidal overflow means that high astronomical tides, especially in combination with above normal surf, will likely produce minor flooding of low-lying areas along the beach such as beach parking lots. Coastal officials should take the necessary precautionary measures to safeguard their beaches. Inexperienced swimmers should remain out of the water to avoid hazardous swimming conditions.
Updated: Dec 4, 1:23 AM Source: NWS Alert