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Hamilton, Ohio 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Hamilton OH
National Weather Service Forecast for: Hamilton OH
Issued by: National Weather Service Wilmington, OH
Updated: 4:00 am EDT Jul 25, 2025
 
This
Afternoon
This Afternoon: A chance of showers and thunderstorms.  Partly sunny, with a high near 92. Heat index values as high as 103. Southwest wind around 6 mph.  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

Tonight

Tonight: A chance of showers and thunderstorms, mainly before 2am.  Mostly cloudy, with a low around 73. Calm wind.  Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms

Saturday

Saturday: Showers and thunderstorms likely, mainly after 2pm.  Partly sunny, with a high near 91. Heat index values as high as 102. Calm wind becoming southwest around 6 mph in the afternoon.  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
Saturday
Night
Saturday Night: Showers and thunderstorms likely before 2am, then a chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am.  Mostly cloudy, with a low around 75. Light southwest wind.  Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
T-storms
Likely then
Chance
Showers
Sunday

Sunday: Showers and thunderstorms likely, mainly between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm.  Partly sunny, with a high near 91. Calm wind becoming west around 6 mph in the afternoon.  Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
T-storms
Likely
Sunday
Night
Sunday Night: Showers likely and possibly a thunderstorm before 8pm, then a slight chance of showers and thunderstorms between 8pm and 2am.  Partly cloudy, with a low around 75. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers
Likely then
Slight Chance
T-storms
Monday

Monday: A chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 93. Chance of precipitation is 40%.
Mostly Sunny
then Chance
T-storms
Monday
Night
Monday Night: A chance of showers and thunderstorms before 8pm.  Mostly clear, with a low around 76. Chance of precipitation is 30%.
Chance
T-storms then
Mostly Clear
Tuesday

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

Hi 92 °F Lo 73 °F Hi 91 °F Lo 75 °F Hi 91 °F Lo 75 °F Hi 93 °F Lo 76 °F Hi 94 °F

Hazardous Weather Outlook
Heat Advisory
 

This Afternoon
 
A chance of showers and thunderstorms. Partly sunny, with a high near 92. Heat index values as high as 103. Southwest wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
 
A chance of showers and thunderstorms, mainly before 2am. Mostly cloudy, with a low around 73. Calm wind. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
 
Showers and thunderstorms likely, mainly after 2pm. Partly sunny, with a high near 91. Heat index values as high as 102. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
 
Showers and thunderstorms likely before 2am, then a chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 75. Light southwest wind. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
 
Showers and thunderstorms likely, mainly between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Partly sunny, with a high near 91. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
 
Showers likely and possibly a thunderstorm before 8pm, then a slight chance of showers and thunderstorms between 8pm and 2am. Partly cloudy, with a low around 75. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
 
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 40%.
Monday Night
 
A chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 76. Chance of precipitation is 30%.
Tuesday
 
Mostly sunny, with a high near 94.
Tuesday Night
 
Mostly clear, with a low around 73.
Wednesday
 
Mostly sunny, with a high near 89.
Wednesday Night
 
Mostly cloudy, with a low around 66.
Thursday
 
Mostly sunny, with a high near 82.

 

Forecast from NOAA-NWS for Hamilton OH.

Weather Forecast Discussion
024
FXUS61 KILN 251815
AFDILN

Area Forecast Discussion
National Weather Service Wilmington OH
215 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 TONIGHT/...
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 THROUGH 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 THURSDAY/...
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 /18Z FRIDAY THROUGH WEDNESDAY/...
Thunderstorm activity this afternoon may get a reinforcing shot of
dynamics on the south side of a boundary that is primarily noted by
the convection that has fired along it. This is likely at the
intersection of increased CAPE values and increased theta-e values
found in a wsw-ene orientation. That is, dynamic and ingredient
based, not discernible in surface observations.

Storms should remain se of Dayton, but upstream convection may eke
further north than the convergent area they are firing on attm which
will necessitate amendments if the trend over central IN increases as
this location is currently covered by a prob30 starting at 22Z which
looks to have the correct timing.

Storms should remain n of Cinci/Lunken this afternoon but will
maintain a closer eye on it as amendments will be necessary if
convection pops further south of the better dynamics indicated by the
boundary and location of current convection.

Isolated activity remains possible this evening but coverage is
sparse and will need to be amended into the fcst or noted with 00Z
issuance.

Some fog is possible at KLUK before daybreak. Scattered storms are
expected to affect the region again on Saturday. This is covered by a
late morning prob30. VFR conditions will prevail outside of LUK fog
and any periods of thunderstorm activity.

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...Franks
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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