Today | Weather | Thursday, December 4, 2025

Weather in Chico, California

01:29 AM
Now
Cloudy Night
43° F
Feels Like 41°
Precipitation 0 %
Wind 5 mph
Humidity 89 %
Today
Cloudy Weather
Day 54°
Night 39°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 2

Chico Weather Forecast Updated

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

Day

66°

Night

41°

Wind

4 mph

Precipitation

1 %

Air Quality in Chico

NOW
24 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.82 µg/m³
PM10 6.82 µg/m³
O3 0.026 ppm
NO2 6.2 ppb
SO2 0.1 ppb
CO 0.19 ppm
NH3 2.91 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)
PM2.54.82 µg/m³
PM106.82 µg/m³
O350.12 µg/m³
NO211.68 µg/m³
SO20.23 µg/m³
CO218.04 µg/m³
NH32.91 µg/m³
NO0 µg/m³