Lancaster, OH Weather Forecast
Fairfield County, Ohio
Seven-day outlook
37–74°F across the weekThe week runs between 45° and 74°, with today the warmest day of it. There is no real trend across it: one day looks much like the next. Monday is the wettest day, peaking near 36%. 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 Lancaster forecast
Lancaster sits at 39.7252°N, 82.6052°W in Fairfield County, Ohio. 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
- Fairfield County
- Coordinates
- 39.7252°N, 82.6052°W
- Population
- 41,422 · 2023 estimate
- Land area
- 19.044 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Lancaster, 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 Lancaster?
The nearest Doppler radar is KILN (Wilmington, OH), 67 miles to the WSW. 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 Lancaster its center is about 5,300 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 KLHQ · Lancaster/Fairfield Cnty on the ASOS/AWOS network, 3.8 miles away. Close enough that its readings are, for practical purposes, the conditions in town.
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 Ohio observing network as of this build.
Forecasts near Lancaster
- Baltimore, OH8 mi
- Lithopolis, OH13 mi
- Pickerington, OH14 mi
- Canal Winchester, OH14 mi
- Buckeye Lake, OH16 mi
- Logan, OH17 mi
- Groveport, OH18 mi
- Ashville, OH19 mi
Elsewhere in Ohio
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