Today | Weather | Sunday, January 18, 2026

Weather in Rialto, California

10:47 PM
Now
Cloudy Night
57° F
Feels Like 54°
Precipitation 0 %
Wind 7 mph
Humidity 38 %
Today
Cloudy Night
Day 77°
Night 48°
Precipitation 0 %
Wind 6 mph

Rialto Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (January 18, 2025)
Cloudy Weather

Day

63°

Night

39°

Wind

4 mph

UV Index

3

Precipitation

0 %

Air Quality in Rialto

NOW
109 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 38.83 µg/m³
PM10 50.4 µg/m³
O3 0.035 ppm
NO2 7.9 ppb
SO2 0.7 ppb
CO 0.35 ppm
NH3 0.18 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:

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Show raw pollutant concentrations (µg/m³)
PM2.538.83 µg/m³
PM1050.4 µg/m³
O368.84 µg/m³
NO214.84 µg/m³
SO21.96 µg/m³
CO397.63 µg/m³
NH30.18 µg/m³
NO0 µg/m³