Today | Weather | Tuesday, April 21, 2026

Weather in Santa Rosa, California

04:49 PM
Now
Sunny with a Chance of Thunderstorms
59° F
Feels Like 57°
Precipitation 49 %
Wind 7 mph
UV Index (0 - 11+) 1
Humidity 67 %
Today
Sunny with a Chance of Thunderstorms
Day 63°
Night 46°
Precipitation 88 %
Wind 7 mph
UV Index (0 - 11+) 4

Santa Rosa Weather Forecast Updated

34 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 21, 2025)
Sunny Weather

Day

75°

Night

46°

Wind

6 mph

UV Index

8

Precipitation

40 %

Air Quality in Santa Rosa

NOW
52 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.51 µg/m³
PM10 1.23 µg/m³
O3 0.055 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.13 ppm
NH3 0 µg/m³
NO 0.04 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)
PM2.50.51 µg/m³
PM101.23 µg/m³
O3107.2 µg/m³
NO20.22 µg/m³
SO20.34 µg/m³
CO144.32 µg/m³
NH30 µg/m³
NO0.04 µg/m³