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Lancaster, Ohio 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Lancaster OH
National Weather Service Forecast for: Lancaster OH
Issued by: National Weather Service Wilmington, OH
Updated: 7:06 pm EDT Jul 4, 2025
 
Tonight

Tonight: Mostly clear, with a low around 68. Calm wind.
Mostly Clear

Saturday

Saturday: Sunny, with a high near 93. Light and variable wind.
Sunny

Saturday
Night
Saturday Night: Mostly clear, with a low around 70. Calm wind.
Mostly Clear

Sunday

Sunday: Sunny, with a high near 93. Southwest wind 3 to 7 mph.
Sunny

Sunday
Night
Sunday Night: Mostly clear, with a low around 71. Southwest wind around 5 mph becoming calm  in the evening.
Mostly Clear

Monday

Monday: A chance of showers and thunderstorms, mainly after 2pm.  Mostly sunny, with a high near 90. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Slight Chance
T-storms then
Chance
T-storms
Monday
Night
Monday Night: A chance of showers and thunderstorms before 8pm.  Partly cloudy, with a low around 69. Chance of precipitation is 30%.
Chance
T-storms then
Partly Cloudy
Tuesday

Tuesday: A chance of showers and thunderstorms after 2pm.  Partly sunny, with a high near 87. Chance of precipitation is 30%.
Partly Sunny
then Chance
T-storms
Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms before 8pm.  Partly cloudy, with a low around 68. Chance of precipitation is 30%.
Chance
T-storms then
Mostly Cloudy
Lo 68 °F Hi 93 °F Lo 70 °F Hi 93 °F Lo 71 °F Hi 90 °F Lo 69 °F Hi 87 °F Lo 68 °F

Air Quality Alert
 

Tonight
 
Mostly clear, with a low around 68. Calm wind.
Saturday
 
Sunny, with a high near 93. Light and variable wind.
Saturday Night
 
Mostly clear, with a low around 70. Calm wind.
Sunday
 
Sunny, with a high near 93. Southwest wind 3 to 7 mph.
Sunday Night
 
Mostly clear, with a low around 71. Southwest wind around 5 mph becoming calm in the evening.
Monday
 
A chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
 
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 69. Chance of precipitation is 30%.
Tuesday
 
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 30%.
Tuesday Night
 
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
Wednesday
 
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 40%.
Wednesday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 40%.
Thursday
 
A chance of showers and thunderstorms. Mostly cloudy, with a high near 84. Chance of precipitation is 50%.
Thursday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Friday
 
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 87. Chance of precipitation is 60%.

 

Forecast from NOAA-NWS for Lancaster OH.

Weather Forecast Discussion
690
FXUS61 KILN 042328
AFDILN

Area Forecast Discussion
National Weather Service Wilmington OH
728 PM EDT Fri Jul 4 2025

.SYNOPSIS...
High pressure will prevail into the weekend amidst increasingly warm
and humid conditions. A weak cold front will approach the area late
Sunday into Monday, providing increased chances for showers and
storms. Isolated showers and storms may continue at times through
midweek with near normal temperatures by midweek.

&&

.NEAR TERM /THROUGH SATURDAY/...
Tranquil conditions continue tonight. Diurnally-driven Cu will
dissipate toward/beyond sunset, yielding seasonably mild temps amidst
mostly clear skies. Lows bottom out in the upper 60s by daybreak
Saturday.

&&

.SHORT TERM /SATURDAY NIGHT/...
The center of the sfc high will slide off to the E of the region by
Saturday, but the "dry" air mass associated with it will persist,
despite the increase in LL SW flow. The midlevel ridge will expand a
bit into the srn OH Vly while also flattening in the Great Lakes as
a S/W approaches from the W. Temps will nudge a degree or two higher
than will be the case today, generally topping out in the low 90s
just about everywhere.

Dry conditions continue Saturday night with more humidity building
into the region by Sunday. Temps dip into the upper 60s and lower
70s by sunrise Sunday.

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
To wrap up the weekend, the ridge begins to break down over the
Great Lakes as a weak trough moves eastward. So while hot and humid
weather will continue Sunday afternoon, the heat will not stick
around with daily rainfall chances providing clouds and heat relief
throughout the upcoming week.

There are some differences in how wet the week could be with weak
systems providing opportunities for rainfall chances. However, there
are some differences across the model suite with the GEFS
contributing to a wetter pattern in contrast to the ECMWF ensembles
which is considerable drier.  The reason for this difference is
dependent on how quickly the next trough arrives to the region by
midweek. The ECMWF ensembles are a bit slower, resulting in drier
conditions on Tuesday and Wednesday. The complete ensemble package
eventually aligns with above normal PWATs arriving to the region for
late in the week.

For the forecast, this results in higher chances for rainfall across
the southern half of the forecast area much of the week, with ECMWF
ensembles contributing to lower chances across the north. Rainfall
chances increase area wide on Thursday and Friday as the next
stronger system moves in.

Temperature outlook: For Sunday, heat indices are in the mid 90s to
approaching 100. For the remainder of the week, temperatures are
near seasonal normals, but local high temperatures will ultimately
be dependent on rainfall development. The lack of deep ridging
decreases the potential for another extended heat wave.

&&

.AVIATION /00Z SATURDAY THROUGH WEDNESDAY/...
Mostly clear skies and light winds will continue through the TAF
period... outside a brief period of patchy river valley fog at LUK.
Generally wind direction on Saturday will be southerly.

OUTLOOK...Thunderstorms are possible Monday and Tuesday.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...Air Quality Alert until midnight EDT Saturday night for OHZ070-071-
     077-078.
     Air Quality Alert from midnight tonight to midnight EDT Saturday
     night for OHZ046-055-056-065.
KY...Air Quality Alert until midnight EDT Saturday night for KYZ091>093.
IN...Air Quality Alert until midnight EDT tonight for INZ050-058-059-066.
     Air Quality Alert until midnight EDT Saturday night for INZ074.

&&

$$

SYNOPSIS...KC
NEAR TERM...KC
SHORT TERM...KC
LONG TERM...McGinnis
AVIATION...
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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