Today | Weather | Wednesday, March 18, 2026
Active Weather Warnings

Weather in Shoreline, Washington

12:04 AM
Now
Cloudy Weather
54° F
Feels Like 46°
Precipitation 34 %
Wind 15 mph
Humidity 81 %
Today
Rainy Weather
Day 57°
Night 52°
Precipitation 88 %
Wind 15 mph
UV Index (0 - 11+) 1

Shoreline Weather Forecast Updated

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

Day

48°

Night

34°

Air Quality in Shoreline

NOW
14 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.1 µg/m³
PM10 3.9 µg/m³
O3 0.016 ppm
NO2 5 ppb
SO2 0.2 ppb
CO 0.18 ppm
NH3 0.23 µg/m³
NO 0.01 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)
PM2.53.1 µg/m³
PM103.9 µg/m³
O330.51 µg/m³
NO29.34 µg/m³
SO20.6 µg/m³
CO201.23 µg/m³
NH30.23 µg/m³
NO0.01 µg/m³

Weather Alerts and Warnings for Shoreline

Severe Future Possible

Flood Watch

Flood Watch issued March 17 at 4:23PM PDT until March 20 at 5:00PM PDT by NWS Seattle WA
Mar 18, 1:00 PM Mar 20, 5:00 PM
WHAT: Flooding caused by excessive rainfall continues to be
possible.

WHERE: Portions of northwest and west central Washington,
including the following counties, in northwest Washington, Skagit
and Whatcom. In west central Washington, King and Snohomish.

WHEN: From Wednesday afternoon through Friday afternoon.

IMPACTS: Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

ADDITIONAL DETAILS:
- High snow levels, heavy rainfall, and snowmelt runoff will
lead to rises on area rivers with flooding possible.
- http://www.weather.gov/safety/flood
+ Read More
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Updated: Mar 17, 11:58 PM Source: NWS Alert