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Portage, Michigan 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Portage MI
National Weather Service Forecast for:
Portage MI
Issued by: National Weather Service Grand Rapids, MI |
| Updated: 2:21 am EDT May 16, 2026 |
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Overnight
Chance
T-storms
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Saturday
Showers
Likely then
Slight Chance
T-storms
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Saturday
Night
Partly Cloudy
then Slight
Chance
Showers
|
Sunday
Slight Chance
Showers then
Chance
T-storms
|
Sunday
Night
Chance
T-storms then
Mostly Clear
|
Monday
Sunny then
Showers
Likely
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Monday
Night
Showers
Likely
|
Tuesday
Chance
T-storms then
Showers
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Tuesday
Night
Showers
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| Lo 55 °F |
Hi 79 °F |
Lo 57 °F |
Hi 82 °F |
Lo 64 °F |
Hi 86 °F |
Lo 65 °F |
Hi 85 °F |
Lo 53 °F |
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Overnight
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A 30 percent chance of showers and thunderstorms after 5am. Clear early, then becoming mostly cloudy, with a low around 55. South wind around 8 mph, with gusts as high as 20 mph. |
Saturday
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Showers and thunderstorms likely, mainly before noon. Partly sunny, with a high near 79. West wind 9 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
Saturday Night
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A slight chance of showers between 3am and 4am. Partly cloudy, with a low around 57. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%. |
Sunday
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A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 82. Light east southeast wind becoming south 6 to 11 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 40%. |
Sunday Night
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A chance of thunderstorms before 8pm. Partly cloudy, with a low around 64. South wind 9 to 11 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. |
Monday
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Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 86. Chance of precipitation is 70%. |
Monday Night
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Showers likely and possibly a thunderstorm before 8pm, then showers likely between 8pm and 2am, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 70%. |
Tuesday
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A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 2pm, then showers and possibly a thunderstorm after 2pm. Partly sunny, with a high near 85. |
Tuesday Night
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Showers and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 53. |
Wednesday
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A chance of showers before 8am. Partly sunny, with a high near 64. |
Wednesday Night
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Partly cloudy, with a low around 43. |
Thursday
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Mostly sunny, with a high near 65. |
Thursday Night
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Partly cloudy, with a low around 44. |
Friday
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Mostly sunny, with a high near 71. |
Forecast from NOAA-NWS
for Portage MI.
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Weather Forecast Discussion
876
FXUS63 KGRR 160625
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
225 AM EDT Sat May 16 2026
.KEY MESSAGES...
- Storms this morning
- Unsettled into next week; strong/severe storms possible Monday
- Cooler mid to late week
&&
.DISCUSSION...
Issued at 224 AM EDT Sat May 16 2026
- Storms this morning
Regional radar shows a well defined MCV moving ENE across central
Wisconsin. A large area of strong to severe storms was noted with
this MCV. Dewpoints in Wisconsin are in the mid 50s...10 degrees
higher than across the cwa. SPC meso progs suggest that we`ll see
500 or so j/k MUCAPE toward sunrise in southwest Lower. This
should result in a weakening trend as the convection pushes across
the lake. This convection should move across the lake around 400
am and continue eastward, exiting the cwa around 12z. Latest GFS
shows increasing shear between 09-12z suggesting that the storms
won`t weaken too quickly despite lower moisture levels. Indeed,
latest IR loop continues to show cooling cloud tops to the west.
Once the convection moves east of the cwa, there will be a lull.
However, a few of the CAMs point toward renewed showers across
near I-94 late morning. Then, the rest of the day through mid
afternoon Sunday will be dry.
- Unsettled into next week; strong/severe storms possible Monday
A northward moving warm front will move into Lower MI Sunday
afternoon, and this may become a focus for renewed convective
development. Dynamics are somewhat weak; shear values are around
20 kts south of I-96, but closer to 35 knots over the northern
cwa, which is where the RRFS EMC shows some development. Once the
warm front moves north, we`ll be watching trends along the cold
front over Wisconsin/Iowa Sunday night into Monday. Strong to
severe storms will fire along the front across Wisconsin Sunday
night and move east, potentially affecting the northern cwa Monday
afternoon with more development farther south along the frontal
boundary Monday night. Some of these storms could be strong to
severe as well. The convective threat will remain until Tuesday
when the cold front will move through.
- Cooler mid to late week
Air behind the cold front will be in the 60s Wednesday and
Thursday...quite a bit cooler than the 80s ahead of it. However,
temperatures will warm into the lower to mid 70s Friday and
Saturday.
&&
.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
Issued at 1223 AM EDT Sat May 16 2026
Regional radar shows thunderstorms over Wisconsin moving east at
40kts. This places the storms over the lake around 430-500
am...pretty much in line with recent CAM trends. Storms will then
move across the cwa and exit around 12z. The rest of the period
looks to be dry.
As the LLJ moves across the terminals early this morning, some
LLWS is possible from 08z-14z or so. Cigs may briefly fall to MVFR
as the precipitation moves through, then rise back to VFR by late
morning.
&&
.MARINE...
Issued at 224 AM EDT Sat May 16 2026
A weak pressure gradient will result in little if any marine
issues through Sunday. Winds will increase Sunday night as low
pressure over the upper Midwest advances eastward; a small craft
advisory may be needed Sunday night through Tuesday.
&&
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory until 5 AM EDT early this morning for
LMZ846>849.
&&
$$
DISCUSSION...04
AVIATION...04
MARINE...04
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