Hourly Weather Forecast for Chula Vista, California

Hourly Weather | Today › Tuesday, July 21, 2026

Active Weather Warnings

High Surf Advisory

Chula Vista, California

3 AM

70°

Feels Like 70°

Humidity: 84%

UV Index: 0

Wind: 5 mph

4 AM

68°

Feels Like 68°

Humidity: 86%

UV Index: 0

Wind: 5 mph

5 AM

66°

Feels Like 66°

Humidity: 89%

UV Index: 0

Wind: 4 mph

6 AM

70°

Feels Like 68°

Humidity: 83%

UV Index: 0

Wind: 5 mph

7 AM

72°

Feels Like 72°

Humidity: 76%

UV Index: 1

Wind: 5 mph

8 AM

70°

Feels Like 72°

Humidity: 76%

UV Index: 2

Wind: 5 mph

9 AM

75°

Feels Like 79°

Humidity: 67%

UV Index: 3

Wind: 6 mph

10 AM

77°

Feels Like 82°

Humidity: 62%

UV Index: 5

Wind: 8 mph

11 AM

79°

Feels Like 84°

Humidity: 59%

UV Index: 8

Wind: 9 mph

12 PM

81°

Feels Like 86°

Humidity: 56%

UV Index: 11

Wind: 9 mph

1 PM

81°

Feels Like 88°

Humidity: 54%

UV Index: 11

Wind: 10 mph

2 PM

81°

Feels Like 88°

Humidity: 52%

UV Index: 11

Wind: 12 mph

3 PM

82°

Feels Like 88°

Humidity: 49%

UV Index: 8

Wind: 12 mph

4 PM

81°

Feels Like 82°

Humidity: 51%

UV Index: 5

Wind: 12 mph

5 PM

81°

Feels Like 81°

Humidity: 52%

UV Index: 3

Wind: 12 mph

6 PM

79°

Feels Like 79°

Humidity: 54%

UV Index: 2

Wind: 10 mph

7 PM

79°

Feels Like 75°

Humidity: 57%

UV Index: 1

Wind: 9 mph

8 PM

75°

Feels Like 73°

Humidity: 64%

UV Index: 0

Wind: 7 mph

9 PM

73°

Feels Like 72°

Humidity: 69%

UV Index: 0

Wind: 7 mph

10 PM

73°

Feels Like 72°

Humidity: 72%

UV Index: 0

Wind: 6 mph

11 PM

73°

Feels Like 72°

Humidity: 74%

UV Index: 0

Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 AM

32 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.6 µg/m³
PM₁₀: 13.79 µg/m³
O₃: 0.035 ppm
NO₂: 0.3 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

4 AM

32 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.69 µg/m³
PM₁₀: 13.79 µg/m³
O₃: 0.034 ppm
NO₂: 0.3 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 AM

31 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.78 µg/m³
PM₁₀: 13.77 µg/m³
O₃: 0.034 ppm
NO₂: 0.3 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 AM

31 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.84 µg/m³
PM₁₀: 13.72 µg/m³
O₃: 0.033 ppm
NO₂: 0.3 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 AM

30 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.89 µg/m³
PM₁₀: 13.63 µg/m³
O₃: 0.033 ppm
NO₂: 0.4 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 AM

30 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.92 µg/m³
PM₁₀: 13.43 µg/m³
O₃: 0.033 ppm
NO₂: 0.3 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 AM

31 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.92 µg/m³
PM₁₀: 13.11 µg/m³
O₃: 0.034 ppm
NO₂: 0.3 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 AM

32 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.9 µg/m³
PM₁₀: 12.85 µg/m³
O₃: 0.034 ppm
NO₂: 0.2 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 AM

33 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.82 µg/m³
PM₁₀: 12.51 µg/m³
O₃: 0.035 ppm
NO₂: 0.2 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

12 PM

34 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.63 µg/m³
PM₁₀: 11.92 µg/m³
O₃: 0.036 ppm
NO₂: 0.2 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

1 PM

34 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.34 µg/m³
PM₁₀: 11.26 µg/m³
O₃: 0.037 ppm
NO₂: 0.1 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

2 PM

35 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.01 µg/m³
PM₁₀: 10.61 µg/m³
O₃: 0.037 ppm
NO₂: 0.1 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

3 PM

35 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.67 µg/m³
PM₁₀: 9.99 µg/m³
O₃: 0.038 ppm
NO₂: 0.1 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

4 PM

35 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.41 µg/m³
PM₁₀: 9.63 µg/m³
O₃: 0.038 ppm
NO₂: 0.1 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.21 µg/m³
PM₁₀: 9.44 µg/m³
O₃: 0.039 ppm
NO₂: 0.1 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 PM

37 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.03 µg/m³
PM₁₀: 9.33 µg/m³
O₃: 0.039 ppm
NO₂: 0.1 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM

37 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.89 µg/m³
PM₁₀: 9.3 µg/m³
O₃: 0.040 ppm
NO₂: 0.2 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM

37 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.84 µg/m³
PM₁₀: 9.44 µg/m³
O₃: 0.040 ppm
NO₂: 0.2 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.89 µg/m³
PM₁₀: 9.78 µg/m³
O₃: 0.039 ppm
NO₂: 0.3 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.98 µg/m³
PM₁₀: 10.13 µg/m³
O₃: 0.039 ppm
NO₂: 0.3 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM

35 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.05 µg/m³
PM₁₀: 10.32 µg/m³
O₃: 0.038 ppm
NO₂: 0.3 ppb
SO₂: 0.2 ppb
CO: 0.07 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Chula Vista

Minor Expected Likely

High Surf Advisory

High Surf Advisory issued July 20 at 2:06PM PDT until July 21 at 11:00PM PDT by NWS San Diego CA

Jul 20, 2:06 PM → Jul 21, 11:00 PM

WHAT: Large breaking waves of 4 to 7 feet with sets up to 8
feet at south or southwest facing beaches.

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

WHEN: Until 11 PM PDT Tuesday.

IMPACTS: Dangerous swimming and surfing conditions and
localized beach erosion.

ADDITIONAL DETAILS: South swell of 4 to 5 feet with a period
of 11-13 seconds generating high surf, primarily for south-
facing beaches. High risk of rip currents exists with high
surf and strong longshore currents are expected on west-facing
beaches. High tides will generally be at or below 5.5 feet,
but localized areas of beach erosion and minor tidal overflow
may occur with the high surf during high tides. Swell and surf
will decrease late Tuesday into Wednesday.

+ Read More

Inexperienced swimmers should remain out of the water due to dangerous surf conditions.

Updated: Jul 21, 1:35 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Chula Vista

High Surf Advisory

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