Today | Weather | Friday, September 18, 2026

Weather in Chico, California

06:35 AM
Now
Sunny Weather
55° F
Feels Like 57°
Precipitation 0 %
Wind 4 mph
UV Index (0 - 11+) 0
Humidity 80 %
Today
Sunny Weather
Day 90°
Night 61°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 5

Chico Weather Forecast Updated

13 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Cloudy Weather

Day

91°

Night

70°

Wind

7 mph

Precipitation

49 %

Air Quality in Chico

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

Pollutant Concentrations:

PM2.5 7.37 µg/m³
PM10 14.07 µg/m³
O3 0.013 ppm
NO2 2.5 ppb
SO2 0.1 ppb
CO 0.15 ppm
NH3 0.86 µg/m³
NO 0.03 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)
PM2.57.37 µg/m³
PM1014.07 µg/m³
O326.21 µg/m³
NO24.7 µg/m³
SO20.18 µg/m³
CO176.52 µg/m³
NH30.86 µg/m³
NO0.03 µg/m³