Decatur, IN Weather Forecast
Adams County, Indiana
Seven-day outlook
38–76°F across the weekThe week runs between 43° and 76°, with today the warmest day of it. There is no real trend across it: one day looks much like the next. Wednesday is the wettest day, peaking near 47%. 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 Decatur forecast
Decatur sits at 40.8289°N, 84.9278°W in Adams County, Indiana. 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
- Adams County
- Coordinates
- 40.8289°N, 84.9278°W
- Population
- 10,020 · 2023 estimate
- Land area
- 6.102 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Decatur, 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 Decatur?
The nearest Doppler radar is KIWX (Fort Wayne, IN), 54 miles to the NW. 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 Decatur its center is about 4,000 ft above ground. That is comfortably inside the useful range. The lowest scan passes low enough over Decatur to show rotation in the part of a storm where tornadoes actually form.
The closest instrument actually measuring the air is KVNW · Van Wert Cnty Arpt on the ASOS/AWOS network, 17 miles away. Far enough that "current conditions" for Decatur 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 Indiana observing network as of this build.
Forecasts near Decatur
- Berne, IN12 mi
- Ossian, IN13 mi
- Bluffton, IN14 mi
- New Haven, IN17 mi
- Van Wert, OH18 mi
- Fort Wayne, IN21 mi
- Celina, OH27 mi
- Portland, IN27 mi
Elsewhere in Indiana
IndianapolisFort WayneEvansvilleFishersSouth BendCarmelAll Indiana forecasts →