Today | Weather | Saturday, August 29, 2026

Active Weather Warnings

Extreme Heat Warning

Weather in Fontana, California

05:06 PM

Now

97° F

Feels Like 95°

Precipitation 0 %

Wind 16 mph

UV Index (0 - 11+) 3

Humidity 22 %

Today

Day 99°

Night 72°

Precipitation 2 %

Wind 8 mph

UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

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.

Fontana Weather Forecast Updated

7 minutes ago

Last updated on August 29, 2026 at 4:58 PM

Weather Forecast History

Last Year's Weather on This Day (August 29, 2025)

Day

93°

Night

66°

Wind

4 mph

Precipitation

0 %

Air Quality in Fontana

NOW

41 AQI

Good air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 9.88 µg/m³

PM₁₀ 28.75 µg/m³

O₃ 0.043 ppm

NO₂ 0.3 ppb

SO₂ 0.3 ppb

CO 0.08 ppm

NH₃ 0 µg/m³

NO 0.08 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 – 9.88 µg/m³

PM₁₀ – 28.75 µg/m³

O₃ – 84.28 µg/m³

NO₂ – 0.54 µg/m³

SO₂ – 0.75 µg/m³

CO – 92.98 µg/m³

NH₃ – 0 µg/m³

NO – 0.08 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Fontana

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued August 29 at 11:40AM PDT until August 29 at 8:00PM PDT by NWS San Diego CA

Aug 29, 11:40 AM → Aug 29, 8:00 PM

WHAT: Dangerously hot conditions with temperatures 96 to 103.

WHERE: San Bernardino and Riverside County Valleys-The Inland
Empire.

WHEN: Until 8 PM PDT this evening.

IMPACTS: Heat related illnesses increase significantly during
extreme heat events.

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Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Updated: Aug 29, 4:58 PM Source: NWS Alert