Today | Weather | Wednesday, May 20, 2026

Weather in Modesto, California

01:54 PM
Now
Cloudy Weather
88° F
Feels Like 97°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 10
Humidity 16 %
Today
Cloudy Weather
Day 91°
Night 59°
Precipitation 0 %
Wind 5 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.

Modesto Weather Forecast Updated

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

Day

90°

Night

57°

Wind

12 mph

UV Index

11

Precipitation

0 %

Air Quality in Modesto

NOW
56 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.81 µg/m³
PM10 8.29 µg/m³
O3 0.056 ppm
NO2 0.4 ppb
SO2 0.3 ppb
CO 0.10 ppm
NH3 0.69 µg/m³
NO 0.16 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)
PM2.54.81 µg/m³
PM108.29 µg/m³
O3110.01 µg/m³
NO20.73 µg/m³
SO20.67 µg/m³
CO116.12 µg/m³
NH30.69 µg/m³
NO0.16 µg/m³