Casco, MI Weather Forecast

St. Clair County, Michigan

Conditions now · Sun, 5:55 PM EDT

72°FDewpoint 54°FPartly cloudy

Measured at KPHN · Port Huron/St Clair Cnty, MI · airport · 12 mi away · 22 minutes ago

Casco, MI at Sun, 5:55 PM EDT: 72°F and partly cloudy, measured at KPHN (Port Huron/St Clair Cnty, MI) 12 mi away, 22 minutes ago. Rest of today: high 77°F, low 57°F, 20% chance of rain. No active National Weather Service alerts for this location.

Current radarNational Weather Service radar · alerts refresh every minuteOpen live map →

Rain: light → heavyRadar mosaic © Iowa Environmental Mesonet / NWS · Basemap © OpenStreetMap contributors, © Protomaps

Hour by hourTemperatureChance of rain

12 PMPartly cloudy75°F1%

1 PMPartly cloudy76°F1%

2 PMPartly cloudy77°F1%

3 PMPartly cloudy77°F1%

4 PMMostly cloudy76°F1%

5 PMMostly cloudy75°F3%

6 PMOvercast71°F13%

7 PMMostly cloudy68°F20%

8 PMMostly cloudy65°F6%

9 PMPartly cloudy61°F2%

10 PMMostly sunny59°F0%

11 PMClear57°F0%

Seven-day outlook

49–78°F across the week

TodaySep 13Partly cloudy · 20% chance of rain57°F / 77°F

MonSep 14Mostly sunny · 1% chance of rain49°F / 68°F

TueSep 15Scattered rain · 33% chance of rain56°F / 78°F

WedSep 16Rain likely · 55% chance of rain63°F / 72°F

ThuSep 17Rain likely · 57% chance of rain63°F / 75°F

FriSep 18Partly cloudy · 13% chance of rain60°F / 72°F

SatSep 19Scattered rain · 32% chance of rain59°F / 71°F

SunSep 20Scattered rain · 32% chance of rain58°F / 67°F

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.

About the Casco forecast

Casco sits at 42.7646°N, 82.6668°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: 42.7646°N, 82.6668°W
Population: 4,003 · 2023 estimate
Land area: 36.881 sq mi

Place data from the US Census Bureau. Coordinates are the Census internal point for Casco, 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 Casco?

The nearest Doppler radar is KDTX (Detroit, MI), 41 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 Casco its centre is about 2,700 ft above ground. That is comfortably inside the useful range. The lowest scan passes low enough over Casco to show rotation in the part of a storm where tornadoes actually form. Casco is closer to its radar than 54% of US cities.

The closest instrument actually measuring the air is KPHN · Port Huron/St Clair Cnty on the ASOS/AWOS network, 12 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 centre 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 Casco

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