Algonac, MI Weather Forecast
St. Clair County, Michigan
Seven-day outlook
40–68°F across the weekThe week runs between 42° and 68°, 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 67%. 4 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 Algonac forecast
Algonac sits at 42.6209°N, 82.5339°W in St. Clair County, Michigan. 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
- St. Clair County
- Coordinates
- 42.6209°N, 82.5339°W
- Population
- 4,125 · 2023 estimate
- Land area
- 1.419 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Algonac, 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 Algonac?
The nearest Doppler radar is KDTX (Detroit, MI), 48 miles to the W. 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 Algonac its center is about 3,400 ft above ground. That is comfortably inside the useful range. The lowest scan passes low enough over Algonac to show rotation in the part of a storm where tornadoes actually form.
The closest instrument actually measuring the air is KMTC · Selfridge ANGB on the ASOS/AWOS network, 15 miles away. Far enough that "current conditions" for Algonac 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 Michigan observing network as of this build.
Forecasts near Algonac
- Clay, MI5 mi
- Cottrellville, MI5 mi
- Marine City, MI7 mi
- Ira, MI8 mi
- East China, MI10 mi
- China, MI11 mi
- New Baltimore, MI11 mi
- Casco, MI12 mi
Elsewhere in Michigan
DetroitGrand RapidsWarrenSterling HeightsAnn ArborLansingAll Michigan forecasts →