Granite Falls, WA Weather Forecast
Snohomish County, Washington
Seven-day outlook
34–57°F across the weekThe week runs between 34° and 57°, with Wednesday the warmest day of it. There is no real trend across it: one day looks much like the next. Tomorrow is the wettest day, peaking near 44%. 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 Granite Falls forecast
Granite Falls sits at 48.0896°N, 121.9692°W in Snohomish 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
- Snohomish County
- Coordinates
- 48.0896°N, 121.9692°W
- Population
- 4,829 · 2023 estimate
- Land area
- 2.192 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Granite Falls, 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 Granite Falls?
The nearest Doppler radar is KATX (Seattle/Tacoma, WA), 25 miles to the WNW. 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 Granite Falls its center is about 1,500 ft above ground. That is about as close as radar coverage gets in the United States: the lowest scan is still near the ground when it reaches Granite Falls, so low-level rotation and the leading edge of a gust front show up on it. Granite Falls is closer to its radar than 77% of US cities.
The closest instrument actually measuring the air is KAWO · Arlington Muni on the ASOS/AWOS network, 10.0 miles away. Near enough to be representative on most days, though a summer thunderstorm can soak one and miss the other entirely.
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 Granite Falls
- Lake Stevens, WA8 mi
- Marysville, WA9 mi
- Arlington, WA10 mi
- Snohomish, WA12 mi
- Everett, WA13 mi
- Monroe, WA16 mi
- Sultan, WA17 mi
- Mill Creek, WA19 mi
Elsewhere in Washington
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