Today | Weather | Saturday, April 4, 2026

Active Weather Warnings

Wind Advisory

Weather in Santa Ana, California

03:32 AM

Now

57° F

Feels Like 55°

Precipitation 40 %

Wind 7 mph

Humidity 47 %

Today

Day 90°

Night 52°

Precipitation 1 %

Wind 7 mph

UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Santa Ana Weather Forecast Updated

Last updated on April 04, 2026 at 1:55 AM

Weather Forecast History

Last Year's Weather on This Day (April 4, 2025)

Day

72°

Night

46°

Wind

7 mph

UV Index

Precipitation

1 %

Air Quality in Santa Ana

NOW

45 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 8.88 µg/m³

PM₁₀ 17.83 µg/m³

O₃ 0.048 ppm

NO₂ 0.3 ppb

SO₂ 0.2 ppb

CO 0.12 ppm

NH₃ 0.04 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 – 8.88 µg/m³

PM₁₀ – 17.83 µg/m³

O₃ – 94.73 µg/m³

NO₂ – 0.57 µg/m³

SO₂ – 0.54 µg/m³

CO – 141.06 µg/m³

NH₃ – 0.04 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Santa Ana

Moderate Expected Likely

Wind Advisory

Wind Advisory issued April 3 at 9:55PM PDT until April 4 at 1:00PM PDT by NWS San Diego CA

Apr 3, 9:55 PM → Apr 4, 1:00 PM

WHAT: Northeast winds 15 to 30 mph with gusts 35 to 50 mph
expected.

WHERE: Orange County Inland Areas, San Bernardino County
Mountains, San Bernardino and Riverside County Valleys-The Inland
Empire, San Gorgonio Pass near Banning, and Santa Ana Mountains
and Foothills.

WHEN: Until 1 PM PDT Saturday.

IMPACTS: Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.

ADDITIONAL DETAILS: Strongest winds through Saturday will be on
the foothills of the San Bernardino mountains through the Cajon
Pass and below the San Gorgonio Pass into the Inland Empire.

+ Read More

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.

Updated: Apr 4, 1:55 AM Source: NWS Alert