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Fairfield, Ohio 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Fairfield OH
National Weather Service Forecast for: Fairfield OH
Issued by: National Weather Service Wilmington, OH
Updated: 6:53 pm EDT Jul 25, 2025
 
Tonight

Tonight: A slight chance of showers and thunderstorms before 8pm.  Partly cloudy, with a low around 76. Light and variable wind.  Chance of precipitation is 20%.
Slight Chance
T-storms then
Partly Cloudy
Saturday

Saturday: Showers and thunderstorms likely, mainly between 3pm and 5pm.  Mostly sunny, with a high near 92. Heat index values as high as 103. Calm wind becoming southwest 5 to 7 mph in the afternoon.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Slight Chance
T-storms then
T-storms
Likely
Saturday
Night
Saturday Night: A chance of showers and thunderstorms, mainly between 8pm and 2am.  Mostly cloudy, with a low around 76. Southwest wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms

Sunday

Sunday: Showers and thunderstorms likely, mainly after 2pm.  Partly sunny, with a high near 91. Heat index values as high as 103. West wind 3 to 6 mph.  Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
T-storms
Likely
Sunday
Night
Sunday Night: Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and 2am.  Mostly cloudy, with a low around 75. Light west wind.  Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
T-storms
Likely then
Slight Chance
Showers
Monday

Monday: A slight chance of thunderstorms, then a chance of showers and thunderstorms after 8am.  Mostly sunny, with a high near 92. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms

Monday
Night
Monday Night: A chance of showers and thunderstorms before 8pm.  Partly cloudy, with a low around 75. Chance of precipitation is 30%.
Chance
T-storms then
Mostly Clear
Tuesday

Tuesday: Mostly sunny, with a high near 94.
Mostly Sunny

Tuesday
Night
Tuesday Night: Mostly clear, with a low around 74.
Mostly Clear

Lo 76 °F Hi 92 °F Lo 76 °F Hi 91 °F Lo 75 °F Hi 92 °F Lo 75 °F Hi 94 °F Lo 74 °F

Hazardous Weather Outlook
Heat Advisory
 

Tonight
 
A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 76. Light and variable wind. Chance of precipitation is 20%.
Saturday
 
Showers and thunderstorms likely, mainly between 3pm and 5pm. Mostly sunny, with a high near 92. Heat index values as high as 103. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
 
A chance of showers and thunderstorms, mainly between 8pm and 2am. Mostly cloudy, with a low around 76. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
 
Showers and thunderstorms likely, mainly after 2pm. Partly sunny, with a high near 91. Heat index values as high as 103. West wind 3 to 6 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
 
Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 75. Light west wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
 
A slight chance of thunderstorms, then a chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 92. Chance of precipitation is 40%. 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 75. Chance of precipitation is 30%.
Tuesday
 
Mostly sunny, with a high near 94.
Tuesday Night
 
Mostly clear, with a low around 74.
Wednesday
 
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 91. Chance of precipitation is 30%.
Wednesday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
Thursday
 
A chance of showers and thunderstorms. Mostly sunny, with a high near 83. Chance of precipitation is 30%.
Thursday Night
 
A chance of thunderstorms. Partly cloudy, with a low around 63. Chance of precipitation is 30%.
Friday
 
Mostly sunny, with a high near 81.

 

Forecast from NOAA-NWS for Fairfield OH.

Weather Forecast Discussion
448
FXUS61 KILN 252316
AFDILN

Area Forecast Discussion
National Weather Service Wilmington OH
716 PM EDT Fri Jul 25 2025

.SYNOPSIS...
Hot and humid conditions will keep the threat of high heat indicies
and thunderstorms with torrential rainfall in the forecast for the
next few days. A frontal boundary laying out over the region will act
as a focus for storms this weekend. These high temperature values
are expected to continue through mid-week.

&&

.NEAR TERM /THROUGH SATURDAY/...
Thunderstorm activity is expected to decrease significantly this
evening, but then see an uptick overnight in west central Ohio.
Threats from tonight`s storms will be the continued potential for
torrential rains and isolated flooding where they hit poorly drained
areas or maintain themselves over an area for any length of time.

Lows from 70-75 will continue to add/accumulate stress on
individuals who may suffer disproportionately from high heat index
values, including but not limited to the elderly, poor, or those with
serious medical conditions.

&&

.SHORT TERM /SATURDAY NIGHT/...
Thunderstorm activity that should be isolated in the northwest during
the early morning will see an uptick by late morning. This activity
will become more scattered in nature and then become likely in the
latter part of the day. This will be most noted north of the Ohio
river where storms will occur at one point in time or another during
the day.

Once again, the primary threat with these storms lies in the
potential for torrential downpours that have a high chance of
creating localized flooding issues. The more persistent activity in
the north where CAPEs >2000 J/kg stands a chance to combine with a
favorable shear profile to produce potentially damaging winds in the
afternoon.

High temperatures will top out in the upper 80s/low 90s. Combined
with a higher moisture environment, heat indicies will reach the
upper 90s to near 100. A few points could top 100 but these will be
the outliers.

Overnight potential for thunderstorms will be focused more to the
north along the I-70 corridor and then shift eastward to central
Ohio. Another uncomfortable night with lows generally 73-75 are
expected.

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
Expansive mid level ridge centered over the southeastern US will
retrograde into the central part of the country during the early part
of the week. Peak height anomalies over the forecast area are still
around 2 standard deviations on Monday. At the surface, a weak east-
west oriented boundary is forecast to sag south out of the lower
Great Lakes on Sunday. With plenty of moisture and instability in
place, this will serve to enhance convective coverage. Locally heavy
rainfall will continue to be the primary concern, although a few
stronger downdrafts will also be possible. That boundary will likely
dissipate by Monday leaving a more weakly forced environment for
diurnal convection with a similar scenario for Tuesday.

A pattern shift will take place later in the week. This starts on
Wednesday when a lead short wave rounding the base of developing
long wave trough tracks across the Great Lakes. This will drive a
cold front across the region Wednesday into Wednesday night. NBM
PoPs remain modest at this juncture which could be related to how
low level forcing and mid level support align. Regardless, CSU MLP
and CIPS analogs do highlight that day for some potential of severe
weather.

There is some uncertainty on Thursday whether the airmass will
completely dry out or whether some showers will be possible as
cooler air aloft spreads in. But there is a higher likelihood of
drier conditions by Friday.

Hot and humid conditions will persist for the first half of the
week. Believe that NBM temperatures and dew points still have their
slightly high bias, synergistically resulting in pretty high
deterministic apparent temperatures. Probabilities of reaching heat
advisory criteria of 100 are generally less than 30 percent area
wide on Sunday. Probabilities increase across southern counties, 40
to 60 percent on Monday and 50 to 70 percent on Tuesday. Higher
probabilities start to get shunted southwards on Wednesday, although
still around 40 percent across northern Kentucky. Air temperatures
will then fall below normal for the end of the week.

&&

.AVIATION /23Z FRIDAY THROUGH WEDNESDAY/...
Due to the impacts from thunderstorms this afternoon and early
evening, winds may be a bit variable before turning back to southerly
or becoming calm. No additional thunderstorms are forecast for area.
The only non prevailing VFR is LUK with some fog before daybreak.

Scattered storms are expected to affect the region again on
Saturday. Due to a lack of confidence in any particular timing,
PROB30s currently outline the general threat from 16Z-23Z.

With the front lifting north again tonight, winds will be southerly
to southwesterly tomorrow afternoon around 8-10 knots.

OUTLOOK...Showers and thunderstorms are possible through Monday,
peaking in activity during the afternoon and early evening.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...Heat Advisory until 8 PM EDT this evening for OHZ063>065-070>074-
     077>082-088.
KY...Heat Advisory until 8 PM EDT this evening for KYZ089>100.
IN...Heat Advisory until 8 PM EDT this evening for INZ066-073>075-080.

&&

$$

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






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