Today | Weather | Thursday, December 4, 2025

Weather in San Bernardino, California

01:30 AM
Now
Night
45° F
Feels Like 43°
Precipitation 0 %
Wind 5 mph
Humidity 41 %
Today
Cloudy Weather
Day 68°
Night 39°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 3

San Bernardino Weather Forecast Updated

11 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 4, 2024)
Night

Day

70°

Night

43°

Wind

4 mph

Precipitation

0 %

Air Quality in San Bernardino

NOW
86 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 29.03 µg/m³
PM10 40.49 µg/m³
O3 0.033 ppm
NO2 12.3 ppb
SO2 2 ppb
CO 0.30 ppm
NH3 0.63 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.529.03 µg/m³
PM1040.49 µg/m³
O365.17 µg/m³
NO223.22 µg/m³
SO25.18 µg/m³
CO340.26 µg/m³
NH30.63 µg/m³
NO0 µg/m³