Today | Weather | Wednesday, May 20, 2026

Weather in Chico, California

01:50 PM
Now
Cloudy Weather
88° F
Feels Like 97°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 9
Humidity 18 %
Today
Cloudy Weather
Day 91°
Night 64°
Precipitation 0 %
Wind 4 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Chico Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 20, 2025)
Sunny Weather

Day

90°

Night

59°

Wind

12 mph

UV Index

10

Precipitation

0 %

Air Quality in Chico

NOW
49 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.65 µg/m³
PM10 3.96 µg/m³
O3 0.053 ppm
NO2 0.4 ppb
SO2 0.2 ppb
CO 0.10 ppm
NH3 0.87 µg/m³
NO 0.17 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)
PM2.52.65 µg/m³
PM103.96 µg/m³
O3104.46 µg/m³
NO20.78 µg/m³
SO20.42 µg/m³
CO111.27 µg/m³
NH30.87 µg/m³
NO0.17 µg/m³