Mill Valley, CA Weather Forecast
Marin County, California
Seven-day outlook
49–67°F across the weekThe week runs between 48° and 67°, with Tuesday the warmest day of it. There is no real trend across it: one day looks much like the next. Saturday is the wettest day, peaking near 30%. 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 Mill Valley forecast
Mill Valley sits at 37.9081°N, 122.5423°W in Marin County, California. 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
- Marin County
- Coordinates
- 37.9081°N, 122.5423°W
- Population
- 13,792 · 2023 estimate
- Land area
- 4.782 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Mill Valley, 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 Mill Valley?
The nearest Doppler radar is KDAX (Sacramento, CA), 62 miles to the NE. 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 Mill Valley its center is about 4,800 ft above ground. That is far enough out that the beam has climbed above the lowest few thousand feet. Storm structure aloft is visible; a shallow circulation near the ground may not be, and a warning here can arrive before anything looks dramatic on the radar picture.
The closest instrument actually measuring the air is KDVO · Novato/Gnoss Fld on the ASOS/AWOS network, 16 miles away. Far enough that "current conditions" for Mill Valley is an educated reading of somewhere else, worth knowing before you plan around a single temperature.
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 California observing network as of this build.
Forecasts near Mill Valley
- Larkspur, CA2 mi
- Corte Madera, CA2 mi
- Sausalito, CA4 mi
- Tiburon, CA5 mi
- San Anselmo, CA5 mi
- San Rafael, CA5 mi
- Fairfax, CA6 mi
- Richmond, CA10 mi
Elsewhere in California
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