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Pontiac, Michigan 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Pontiac MI
National Weather Service Forecast for: Pontiac MI
Issued by: National Weather Service Detroit/Pontiac, MI
Updated: 12:24 am EDT Jul 15, 2025
 
Overnight

Overnight: Clear, with a low around 66. Light west wind.
Clear

Tuesday

Tuesday: Sunny, with a high near 90. Calm wind becoming south southwest around 6 mph in the afternoon.
Sunny

Tuesday
Night
Tuesday Night: Mostly clear, with a low around 70. South wind around 6 mph becoming calm  in the evening.
Mostly Clear

Wednesday

Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm.  Partly sunny, with a high near 87. Calm wind becoming south around 6 mph in the morning.  Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms then
Showers
Likely
Wednesday
Night
Wednesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am.  Partly cloudy, with a low around 71. South wind around 6 mph.  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
Chance
T-storms
Thursday

Thursday: A chance of showers, then showers and thunderstorms likely after 11am.  Mostly cloudy, with a high near 83. Chance of precipitation is 70%.
T-storms
Likely

Thursday
Night
Thursday Night: Showers and thunderstorms likely before 8pm, then a chance of showers between 8pm and 2am.  Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
T-storms
Likely then
Chance
Showers
Friday

Friday: Partly sunny, with a high near 77.
Partly Sunny

Friday
Night
Friday Night: Partly cloudy, with a low around 60.
Partly Cloudy

Lo 66 °F Hi 90 °F Lo 70 °F Hi 87 °F Lo 71 °F Hi 83 °F Lo 62 °F Hi 77 °F Lo 60 °F

Air Quality Alert
 

Overnight
 
Clear, with a low around 66. Light west wind.
Tuesday
 
Sunny, with a high near 90. Calm wind becoming south southwest around 6 mph in the afternoon.
Tuesday Night
 
Mostly clear, with a low around 70. South wind around 6 mph becoming calm in the evening.
Wednesday
 
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. Calm wind becoming south around 6 mph in the morning. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Partly cloudy, with a low around 71. South wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
 
A chance of showers, then showers and thunderstorms likely after 11am. Mostly cloudy, with a high near 83. Chance of precipitation is 70%.
Thursday Night
 
Showers and thunderstorms likely before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Friday
 
Partly sunny, with a high near 77.
Friday Night
 
Partly cloudy, with a low around 60.
Saturday
 
A chance of showers after 2pm. Partly sunny, with a high near 83.
Saturday Night
 
A chance of showers. Mostly cloudy, with a low around 66.
Sunday
 
A chance of showers and thunderstorms. Partly sunny, with a high near 84.
Sunday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Monday
 
Mostly sunny, with a high near 81.

 

Forecast from NOAA-NWS for Pontiac MI.

Weather Forecast Discussion
367
FXUS63 KDTX 150400
AFDDTX

Area Forecast Discussion
National Weather Service Detroit/Pontiac MI
1200 AM EDT Tue Jul 15 2025

.KEY MESSAGES...

- Sunny and warm Tuesday with temperatures around 90 degrees and
heat indices in the low 90s.

- Shower and thunderstorm chances Wednesday and Thursday with
potential for heavy rainfall.

- A cold front sweeps through the area early Friday followed by
cooler and less humid air next weekend.

&&

.AVIATION...

Predominately VFR conditions are expected through this TAF period
with minimal clouds and light winds. High pressure moves directly
over southeast Michigan and to the east tomorrow turning winds out
of the south. Main item of note remains the presence of wild fire
smoke near the surface that is bringing occasional periods of MVFR
haze. The other item is, some models want to develop areas of fog or
patchy fog across parts of southeast Michigan during the early
morning hours. Confidence in a widespread fog is low, so will leave
out for now and monitor trends through the morning hours.

For DTW/D21 Convection...No thunderstorms expected this TAF period.

THRESHOLD PROBABILITIES...

* None.

&&

.PREV DISCUSSION...
Issued at 326 PM EDT Mon Jul 14 2025

DISCUSSION...

Dry and stable conditions have become established over SE Michigan
today, with the 14.12z KDTX RAOB sampling PWAT values of 0.59" and
dewpoint depressions of over 40 C in the 700-600mb layer. Clear
skies continue through the evening, albeit with filtered sunshine as
a thin layer of Canadian wildfire smoke remains trapped in the sub-
inversion layer. This has muted the diurnal temperature response,
capping daytime highs in the mid-80s which falls short a few degrees
of nearly all model guidance. Varying degrees of surface visibility
reductions have been observed throughout the day as well, with this
transient nature expected through the rest of the evening.

Persistence of the surface high and ridging aloft ensure similar
conditions on Tuesday, while the subsidence inversion caps chances
of convection during the daytime hours. Modest thickness advection
tonight and Tuesday morning along with departing wildfire smoke
afford a few degree temperature boost to bring daytime highs toward
90 degrees under plenty of solar insolation. The surface high is
projected to track right overhead on Tuesday, with divergent surface
flow keeping Gulf moisture (70+ degree dewpoints) well south in the
Ohio Valley. Thus humidity is not expected to raise heat indices
beyond the low 90s.

Pattern shift then begins early Wednesday morning as a vort max/cut
off low lifts into the Ohio Valley along the left exit region of a
25-30 knot 500mb speed max. This lifts a warm front north of the
state line Wed morning which quickly brings dewpoints into the low
70s, MLCAPE values toward 1500 J/kg, and PWAT values near 2.0
inches. Multiple synoptic scale forcing mechanisms will be in play
Wednesday and Thursday to engage the moisture-rich/unstable airmass,
beginning with the southern stream shortwave that shears east into
western Lake Erie early Wednesday morning. Moisture with this
feature is expected to shear east quickly during the morning, and
should allow for at least pockets of sunshine during the first half
of the day Wednesday. Pending this clearing, forecast soundings show
no issue with surface temperatures reaching convective temps by mid-
day to support increasing coverage of pop up showers and
thunderstorms during the peak heating cycle Wednesday. Low
confidence in organized storm potential during the afternoon due to
lack of column flow, but this will be supportive for slow-moving
storms (< 20 mph) that will be conducive for heavy rainfall
especially considering the thermodynamic profiles in place.

Mid-level flow and synoptic forcing then increase Wednesday night
and Thursday as a series of low amplitude shortwaves ripple ahead of
the incoming cold front. This provides a more focused window for
organized thunderstorm potential, but with low confidence as these
types of setups are usually heavily influenced by diabatic heating
and storm/mesoscale boundaries. A cold front eventually sweeps
through the region early Friday, which brings temperatures back
into the mid 80s for the weekend.

MARINE...

Light, mostly southerly winds, the through mid week period will
support warm temperatures and increasing moisture. The next chance
for showers and thunderstorms will enter Wednesday through early
Friday as a series of upper-level disturbances and cold front pass
over the Great Lakes. This brings the chance for some localized
stronger wind gusts with any thunderstorm development, but otherwise
winds remain light given the weaker pressure gradient in place.

&&

.DTX WATCHES/WARNINGS/ADVISORIES...
MI...None.
Lake Huron...None.
Lake St Clair...None.
Michigan waters of Lake Erie...None.
&&

$$

AVIATION.....AA
DISCUSSION...MV
MARINE.......SF


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at www.weather.gov/detroit.
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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