Today | Weather | Wednesday, October 21, 2026

Weather in Riverside, California

03:57 AM
Now
Cloudy Night
63° F
Feels Like 63°
Precipitation 36 %
Wind 5 mph
Humidity 88 %
Today
Stormy Weather
Day 82°
Night 61°
Precipitation 65 %
Wind 7 mph
UV Index (0 - 11+) 2

Riverside Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 21, 2025)
Rainy Night

Day

90°

Night

61°

Wind

5 mph

Precipitation

55 %

Air Quality in Riverside

NOW
37 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4 µg/m³
PM10 13.5 µg/m³
O3 0.040 ppm
NO2 1.1 ppb
SO2 0.6 ppb
CO 0.12 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:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.5 – 4 µg/m³
PM10 – 13.5 µg/m³
O3 – 79.08 µg/m³
NO2 – 2.06 µg/m³
SO2 – 1.47 µg/m³
CO – 139.76 µg/m³
NH3 – 0.18 µg/m³
NO – 0 µg/m³