Today | Weather | Sunday, August 23, 2026

Weather in Modesto, California

11:14 PM
Now
Cloudy Night
81° F
Feels Like 79°
Precipitation 0 %
Wind 7 mph
Humidity 35 %
Today
Cloudy Weather
Day 97°
Night 66°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

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.

Modesto Weather Forecast Updated

Weather Forecast History
Last Year's Weather on This Day (August 23, 2025)
Stormy Weather

Day

100°

Night

66°

Wind

7 mph

Precipitation

55 %

Air Quality in Modesto

NOW
24 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.59 µg/m³
PM10 9.68 µg/m³
O3 0.026 ppm
NO2 1.9 ppb
SO2 0.1 ppb
CO 0.08 ppm
NH3 0.28 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)
PM2.53.59 µg/m³
PM109.68 µg/m³
O350.75 µg/m³
NO23.58 µg/m³
SO20.36 µg/m³
CO94.34 µg/m³
NH30.28 µg/m³
NO0 µg/m³