Today | Weather | Tuesday, December 9, 2025

Weather in Rialto, California

05:18 PM
Now
Night
73° F
Feels Like 72°
Precipitation 0 %
Wind 9 mph
Humidity 21 %
Today
Sunny Weather
Day 81°
Night 48°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 3

Rialto Weather Forecast Updated

32 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 9, 2024)
Night

Day

70°

Night

50°

Wind

16 mph

Precipitation

0 %

Air Quality in Rialto

NOW
167 AQI
Unhealthy air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 88.3 µg/m³
PM10 105.01 µg/m³
O3 0.046 ppm
NO2 40 ppb
SO2 1.9 ppb
CO 0.66 ppm
NH3 1.18 µg/m³
NO 0.45 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:

Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.

Show raw pollutant concentrations (µg/m³)
PM2.588.3 µg/m³
PM10105.01 µg/m³
O389.61 µg/m³
NO275.18 µg/m³
SO24.91 µg/m³
CO760.15 µg/m³
NH31.18 µg/m³
NO0.45 µg/m³