Today | Weather | Friday, September 18, 2026

Weather in Modesto, California

02:38 AM
Now
Night
59° F
Feels Like 57°
Precipitation 0 %
Wind 6 mph
Humidity 82 %
Today
Sunny Weather
Day 84°
Night 57°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 6

Modesto Weather Forecast Updated

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

Day

88°

Night

68°

Wind

7 mph

Precipitation

88 %

Air Quality in Modesto

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

Pollutant Concentrations:

PM2.5 5.96 µg/m³
PM10 12.25 µg/m³
O3 0.026 ppm
NO2 1.9 ppb
SO2 0.1 ppb
CO 0.15 ppm
NH3 0.25 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)
PM2.55.96 µg/m³
PM1012.25 µg/m³
O351.96 µg/m³
NO23.57 µg/m³
SO20.3 µg/m³
CO174.76 µg/m³
NH30.25 µg/m³
NO0 µg/m³