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Green Bay, Wisconsin 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Green Bay WI
National Weather Service Forecast for: Green Bay WI
Issued by: National Weather Service Green Bay, WI
Updated: 5:21 pm CDT Jul 11, 2025
 
Tonight

Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am.  Patchy fog after 2am. Low around 67. South southeast wind around 6 mph.  Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and
Patchy Fog
Saturday

Saturday: A 50 percent chance of showers and thunderstorms, mainly after 2pm.  Patchy smoke after 5pm. Mostly cloudy, with a high near 83. Heat index values as high as 87. West southwest wind 6 to 13 mph, with gusts as high as 18 mph.  New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Chance
T-storms
Saturday
Night
Saturday Night: A 10 percent chance of showers and thunderstorms before 7pm.  Patchy smoke before 8pm. Mostly clear, with a low around 63. West wind 6 to 10 mph, with gusts as high as 18 mph.
Slight Chance
T-storms then
Mostly Clear
Sunday

Sunday: Patchy smoke after 10am. Mostly sunny, with a high near 83. West wind 6 to 9 mph.
Patchy Smoke

Sunday
Night
Sunday Night: Mostly clear, with a low around 67. Southwest wind around 7 mph.
Mostly Clear

Monday

Monday: Sunny, with a high near 86.
Sunny

Monday
Night
Monday Night: Partly cloudy, with a low around 67.
Partly Cloudy

Tuesday

Tuesday: A 30 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 87.
Mostly Sunny
then Chance
T-storms
Tuesday
Night
Tuesday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 67.
Chance
T-storms
Lo 67 °F Hi 83 °F Lo 63 °F Hi 83 °F Lo 67 °F Hi 86 °F Lo 67 °F Hi 87 °F Lo 67 °F

Hazardous Weather Outlook
Air Quality Alert
 

Tonight
 
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Patchy fog after 2am. Low around 67. South southeast wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
 
A 50 percent chance of showers and thunderstorms, mainly after 2pm. Patchy smoke after 5pm. Mostly cloudy, with a high near 83. Heat index values as high as 87. West southwest wind 6 to 13 mph, with gusts as high as 18 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
 
A 10 percent chance of showers and thunderstorms before 7pm. Patchy smoke before 8pm. Mostly clear, with a low around 63. West wind 6 to 10 mph, with gusts as high as 18 mph.
Sunday
 
Patchy smoke after 10am. Mostly sunny, with a high near 83. West wind 6 to 9 mph.
Sunday Night
 
Mostly clear, with a low around 67. Southwest wind around 7 mph.
Monday
 
Sunny, with a high near 86.
Monday Night
 
Partly cloudy, with a low around 67.
Tuesday
 
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.
Tuesday Night
 
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Wednesday
 
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.
Wednesday Night
 
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Thursday
 
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 74.
Thursday Night
 
A 20 percent chance of showers. Mostly cloudy, with a low around 58.
Friday
 
Sunny, with a high near 75.

 

Forecast from NOAA-NWS for Green Bay WI.

Weather Forecast Discussion
172
FXUS63 KGRB 112138
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
438 PM CDT Fri Jul 11 2025

Forecast discussion for routine afternoon forecast issuance

.KEY MESSAGES...

- Rain and non-severe thunderstorms are expected this evening and
  overnight. A narrow band of heavy rain (1-2+ inches) is
  possible east of a Stevens Point to Iron Mountain line, which
  may result in flooding of urban and low-lying areas.

- A few strong to severe storms will be possible on Saturday.
  Gusty winds, isolated large hail, and heavy downpours will be
  the main hazards with any stronger storms.

- Next round of active weather arrives during the middle of next week.

&&

.DISCUSSION...
Issued at 438 PM CDT Fri Jul 11 2025

Precipitation/Thunderstorm Chances...This afternoon`s water vapor
imagery was showing two features of interest. A developing MCS
was located over eastern IA/southwestern WI/northwestern IL, while
a line of convection developed along a cold front in northern MN.

In the near term, the attention is focused with the developing MCS
as models have trended with a slightly further north track. While
the higher potential for severe weather will remain well to the
south of the forecast area, a threat for a narrow corridor of heavy
rainfall is seeming more apparent as models indicate the deformation
zone of the system will set up somewhere over the area tonight.
There seems to be a general consensus the narrow band will occur
east of a Stevens Point to Iron Mountain line. Within this band, 1
to 2+ inches of rainfall and localized flooding is possible. Even
higher, very localized, rainfall amounts cannot be ruled out given
the abnormal PWATs of 1.75 to 2.10 inches (175-200% of normal for
this time of year). Locations in north-central WI will see the
lowest rainfall amounts (0.50 inches or less). The precip associated
with this system will come to an end Saturday morning as it exits to
the northeast of the region.

The aforementioned cold front in northern MN will be the feature
of concern for Saturday as it tracks across the forecast area.
There is good consensus that a broken line of showers and
thunderstorms will develop along the front sometime midday
Saturday or Saturday afternoon over the area. The front and
convection will exit by Saturday evening. A tongue of 1000-1500
J/kg of MUCAPE, deep-layer shear of 35-45 kts, and steep mid-level
lapse rates will support a marginal severe threat for any of the
storms that develop along the front. However, if there is too much
cloud debris Saturday morning from the overnight precipitation,
this may hinder some of the instability for the afternoon. If
strong or severe thunderstorms develop, damaging winds, large
hail, and brief heavy downpours will all be possible.

Following the cold front, models continue to show subtle indications
of a weak boundary sweeping across the area late Sunday or Monday,
which could bring light precip and thunderstorm chances. Otherwise,
sometime midweek will be the next chance for widespread
precipitation and thunderstorms.

Smoke...An area of smoke from Canadian wildfires was observed on
visible satellite imagery this afternoon entering far northwest MN,
following the previously mentioned cold front. Smoke models indicate
a concentrated area of near-surface smoke sweeping across the
forecast area following the front for Saturday and continuing into
Sunday. As a result, coordination with the WI DNR has led to the
issuance of an Air Quality Advisory for the entire state through
noon Monday, with the PM2.5 AQI reaching the Unhealthy for Sensitive
Groups to Unhealthy level.

&&

.AVIATION...for 18Z TAF Issuance
Issued at 110 PM CDT Fri Jul 11 2025

A mix of MVFR and VFR ceilings will continue this afternoon and
evening. A stray shower will possible this afternoon and early
evening across central and north central WI as daytime
instability builds. Otherwise, look for ceilings and vsbys to drop
later this evening and overnight (to IFR/MVFR) as a MCV spreads
showers/storms across much of the area. Still some disagreement
where the heaviest rain will fall (likely somewhere east of a
Stevens Point to Iron Mtn line), along with the best chance for a
storm, so have keep the storm chances in PROB30s for now. The
showers associated with the MCV will end early Saturday morning,
with isolated to scattered round of quick moving showers and
storms expected Saturday afternoon.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION.....Kruk
AVIATION.......Bersch
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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