Today | Weather | Wednesday, March 18, 2026

Weather in Chico, California

02:00 AM
Now
Night
57° F
Feels Like 57°
Precipitation 0 %
Wind 5 mph
Humidity 85 %
Today
Sunny Weather
Day 88°
Night 55°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 5

Chico Weather Forecast Updated

33 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 18, 2025)
Sunny Weather

Day

59°

Night

39°

Wind

4 mph

UV Index

5

Precipitation

6 %

Air Quality in Chico

NOW
23 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 5.6 µg/m³
PM10 7.5 µg/m³
O3 0.017 ppm
NO2 4.1 ppb
SO2 0.1 ppb
CO 0.16 ppm
NH3 2.43 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)
PM2.55.6 µg/m³
PM107.5 µg/m³
O333.65 µg/m³
NO27.64 µg/m³
SO20.14 µg/m³
CO178.33 µg/m³
NH32.43 µg/m³
NO0 µg/m³