Today | Weather | Wednesday, March 18, 2026

Weather in Modesto, California

11:14 AM
Now
Sunny Weather
72° F
Feels Like 79°
Precipitation 0 %
Wind 2 mph
UV Index (0 - 11+) 4
Humidity 69 %
Today
Cloudy Weather
Day 90°
Night 59°
Precipitation 0 %
Wind 4 mph
UV Index (0 - 11+) 5

Modesto Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 18, 2025)
Cloudy Weather

Day

63°

Night

36°

Wind

9 mph

UV Index

5

Precipitation

5 %

Air Quality in Modesto

NOW
79 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 25.62 µg/m³
PM10 31.07 µg/m³
O3 0.031 ppm
NO2 4.6 ppb
SO2 0.4 ppb
CO 0.25 ppm
NH3 4.77 µg/m³
NO 2.51 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.525.62 µg/m³
PM1031.07 µg/m³
O360.16 µg/m³
NO28.6 µg/m³
SO20.93 µg/m³
CO288.49 µg/m³
NH34.77 µg/m³
NO2.51 µg/m³