National Weather Service Forecast for: Lancaster, OH Issued by: National Weather Service Wilmington, OH

Updated: 4:01 pm EDT Aug 21, 2026

This Afternoon Sunny Saturday Mostly Sunny then Slight Chance Showers And T-Storms Sunday Sunny Monday Sunny Tuesday Sunny Wednesday Mostly Sunny then Slight Chance Showers And T-Storms Thursday Chance Showers And T-Storms   Hi 80 °F Hi 79 °F Hi 74 °F Hi 73 °F Hi 75 °F Hi 78 °F Hi 80 °F     Tonight Mostly Clear Saturday Night Chance Showers And T-Storms then Partly Cloudy Sunday Night Mostly Clear Monday Night Partly Cloudy Tuesday Night Partly Cloudy Wednesday Night Slight Chance Showers And T-Storms then Chance Showers And T-Storms Thursday Night Chance Showers And T-Storms then Partly Cloudy   Lo 61 °F Lo 59 °F Lo 55 °F Lo 55 °F Lo 58 °F Lo 63 °F Lo 63 °F

Forecast from NOAA-NWS for Lancaster, OH.

086
FXUS61 KILN 211746
AFDILN

Area Forecast Discussion
National Weather Service Wilmington OH
146 PM EDT Fri Aug 21 2026

.WHAT HAS CHANGED...
No significant changes.

&&

.KEY MESSAGES...
1) Additional showers and thunderstorms are expected on Saturday
as another cold front moves through the Ohio Valley.

&&

.DISCUSSION...
KEY MESSAGE 1)
Dry conditions persist through tonight, with some fog development
possible again. However, most of the fog will be confined to the
river valleys and portions of north-central KY into the Scioto
Valley.

Heading into Saturday, a shortwave trough will eject through the Ohio
Valley, helping to generate scattered showers and storms during the
day. Some CAMs do show some isolated showers developing during the
mid to late morning hours, but the better chances for convection will
be during the afternoon and evening.

PWATs still only appear to be reaching the 1.25" to 1.50" range.
While brief pockets of heavier showers are possible, cells are
expected to be more progressive, limiting any hydro/flooding
concerns.

SPC has maintained a Marginal Risk for severe weather on Saturday.
Most CAMs do try to develop moderate instability into our CWA, but
model guidance does suggest a fair amount of cloud coverage
throughout the day. Effective shear generally remains around 25 kts
on the high end, so storm organization will be limited. However,
cannot rule out a few rogue storms that have some strong to damaging
wind gusts. Large hail also cannot be ruled out with some cooler air
aloft and lower freezing levels, but that risk appears to remain
isolated as well.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
Diurnal cu field generally remains VFR, but some pockets of MVFR
cannot be ruled out this afternoon.

Mostly clear skies develop again tonight, with some BR expected.
However, fewer impacts from fog are anticipated tonight -- primary
vsby reductions will be at KLUK with the proximity of the river.

Cu field builds back in on Saturday and surface winds increase out of
the southwest ahead of a cold front. Some afternoon showers and
storms will be possible.


OUTLOOK...Thunderstorms possible Saturday afternoon and evening.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...None.
KY...None.
IN...None.

&&

$$

DISCUSSION...Clark
AVIATION...Clark

NWS ILN Office Area Forecast Discussion