Today | Weather | Sunday, December 14, 2025

Active Weather Warnings

Dense Fog Advisory

Weather in San Jose, California

05:06 AM

Now

43° F

Feels Like 43°

Precipitation 0 %

Wind 2 mph

Humidity 95 %

Today

Day 57°

Night 43°

Precipitation 0 %

Wind 4 mph

UV Index (0 - 11+) 2

San Jose Weather Forecast Updated

42 minutes ago

Last updated on December 14, 2025 at 4:24 AM

Weather Forecast History

Last Year's Weather on This Day (December 14, 2024)

Day

59°

Night

41°

Wind

4 mph

Precipitation

1 %

Air Quality in San Jose

NOW

37 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 8.72 µg/m³

PM₁₀ 15.35 µg/m³

O₃ 0.040 ppm

NO₂ 0.8 ppb

SO₂ 0.4 ppb

CO 0.11 ppm

NH₃ 0.05 µg/m³

NO 0 µg/m³

PM_2.5 – 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)

PM_2.5 – 8.72 µg/m³

PM₁₀ – 15.35 µg/m³

O₃ – 77.84 µg/m³

NO₂ – 1.49 µg/m³

SO₂ – 1.13 µg/m³

CO – 120.96 µg/m³

NH₃ – 0.05 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for San Jose

Moderate Expected Likely

Dense Fog Advisory

Dense Fog Advisory issued December 14 at 4:03AM PST until December 14 at 11:00AM PST by NWS San Francisco CA

Dec 14, 4:03 AM → Dec 14, 11:00 AM

WHAT: Visibility one quarter mile or less in dense fog.

WHERE: Santa Clara Valley, including San Jose.

WHEN: Until 11 AM PST this morning.

IMPACTS: Hazardous driving conditions due to low visibility.

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If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Updated: Dec 14, 4:24 AM Source: NWS Alert