Today | Weather | Wednesday, October 7, 2026
Active Weather Warnings

Weather in Fontana, California

09:56 PM
Now
Night
82° F
Feels Like 81°
Precipitation 0 %
Wind 5 mph
Humidity 43 %
Today
Night
Day 100°
Night 72°
Precipitation 0 %
Wind 5 mph

Fontana Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 7, 2025)
Night

Day

79°

Night

55°

Wind

4 mph

Precipitation

0 %

Air Quality in Fontana

NOW
49 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 11.65 µg/m³
PM10 25.39 µg/m³
O3 0.044 ppm
NO2 1.7 ppb
SO2 0.4 ppb
CO 0.11 ppm
NH3 0 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.5 – 11.65 µg/m³
PM10 – 25.39 µg/m³
O3 – 86.01 µg/m³
NO2 – 3.12 µg/m³
SO2 – 1.08 µg/m³
CO – 124.63 µg/m³
NH3 – 0 µg/m³
NO – 0 µg/m³

Weather Alerts and Warnings for Fontana

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued October 7 at 11:47AM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
Oct 7, 11:47 AM → Oct 8, 8:00 PM
WHAT: Dangerously hot conditions with high temperatures in the
upper 90s to 105. Nights will be very warm with low temperatures in
the upper 60s to low 70s.

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

WHEN: Until 8 PM PDT Thursday.

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: Oct 7, 8:55 PM Source: NWS Alert