Friday Harbor, WA Weather Forecast
San Juan County, Washington
Seven-day outlook
42–53°F across the weekThe week runs between 42° and 52°, with today the warmest day of it. There is no real trend across it: one day looks much like the next. Today is the wettest day, peaking near 31%. 5 of the 7 days stay dry.
Forecasts come from the National Weather Service's own computer models, and current conditions from the nearest reporting weather station. Both are served through the weather API. A forecast is guidance, not a warning, and anything the Weather Service has actually issued is on the live map.
The written summaries on this page are generated from the forecast data above, not by a meteorologist. Each sentence is a reading of the same numbers you can see, and no forecaster has reviewed them.
About the Friday Harbor forecast
Friday Harbor sits at 48.5339°N, 123.0190°W in San Juan County, Washington. The forecast above is drawn for that point from the National Weather Service's own computer models: a seven-day outlook, and a finer-grained one covering the next eighteen hours where it reaches, and the radar and alert panels show what the Weather Service has out over the area right now.
- County
- San Juan County
- Coordinates
- 48.5339°N, 123.0190°W
- Population
- 2,736 · 2023 estimate
- Land area
- 2.187 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Friday Harbor, and the forecast is for that location, not for every address inside the city limits, and a large city can have real weather differences from one side to the other.
How well can the network see Friday Harbor?
The nearest Doppler radar is KATX (Seattle/Tacoma, WA), 34 miles to the SE. A WSR-88D's lowest routine scan sits half a degree above horizontal, and the earth curves away beneath it, so by the time that beam reaches Friday Harbor its center is about 2,100 ft above ground. That is comfortably inside the useful range. The lowest scan passes low enough over Friday Harbor to show rotation in the part of a storm where tornadoes actually form. Friday Harbor is closer to its radar than 65% of US cities.
The closest instrument actually measuring the air is KFHR · Friday Harbor Arpt on the ASOS/AWOS network, 1.0 miles away. Close enough that its readings are, for practical purposes, the conditions in town.
Beam height is the standard 4/3-earth approximation for the 0.5° scan and assumes normal refraction; it is where the center of the beam is, not its edges, and unusual temperature profiles bend it. Radar siting from the NWS WSR-88D network, station positions from the Washington observing network as of this build.
Forecasts near Friday Harbor
- Anacortes, WA18 mi
- Oak Harbor, WA24 mi
- Bellingham, WA29 mi
- Ferndale, WA29 mi
- Port Townsend, WA30 mi
- Burlington, WA32 mi
- Sequim, WA32 mi
- Mount Vernon, WA33 mi
Elsewhere in Washington
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