Today | Weather | Friday, April 17, 2026

Weather in Santa Rosa, California

04:05 AM
Now
Night
52° F
Feels Like 48°
Precipitation 0 %
Wind 7 mph
Humidity 36 %
Today
Cloudy Weather
Day 73°
Night 43°
Precipitation 1 %
Wind 6 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.

Santa Rosa Weather Forecast Updated

28 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 17, 2025)
Cloudy Weather

Day

66°

Night

48°

Wind

6 mph

UV Index

5

Precipitation

8 %

Air Quality in Santa Rosa

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.1 µg/m³
PM10 8.43 µg/m³
O3 0.048 ppm
NO2 0.7 ppb
SO2 0.4 ppb
CO 0.13 ppm
NH3 0.19 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)
PM2.52.1 µg/m³
PM108.43 µg/m³
O394.36 µg/m³
NO21.31 µg/m³
SO21.16 µg/m³
CO151.97 µg/m³
NH30.19 µg/m³
NO0 µg/m³