Duluth, Minnesota 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

649
FXUS63 KDLH 052333
AFDDLH

Area Forecast Discussion
National Weather Service Duluth MN
633 PM CDT Fri Sep 5 2025

.KEY MESSAGES...

- Gale Warning for portions of western Lake Superior through
  tonight.

- Frost Advisory tonight into Saturday morning for portions of
  northeast Minnesota, including the Arrowhead, Iron Range and
  Borderlands areas.

- Continued cool on Saturday with scattered rain showers and a
  few embedded thunderstorms.

- Frost will be a concern on Saturday and Sunday nights before
  temperatures warm next week.

&&

.DISCUSSION...
Issued at 121 PM CDT Fri Sep 5 2025

Issued a Frost Advisory for tonight into Saturday morning for
portions of northeast Minnesota, including the Arrowhead, Iron
Range and Borderlands areas, namely inland Lake and Cook
counties, northern and central St. Louis county, Koochiching and
northern Itasca counties. Given what will be a very cool start
to the evening, frost is likely for the above areas with light
winds with a reduced pressure gradient and clearing skies as
wrap around moisture pushes east through the evening and night.
Some mid level cloud cover is expected through the night,
however, the cool start to the evening should make low
temperatures in the lower to mid 30s very achievable. Elsewhere
across northeast Minnesota and northwest Wisconsin, the frost
threat is not zero, and will be largely dependent on how fast
winds and clouds decrease this evening. An expansion of the
Frost Advisory is not out of the question.

Furthermore, there is also a non-zero chance for a few
snowflakes from fading rain showers near sunset this evening.

Another cool day is forecast on Saturday across the Northland
with cyclonic flow aloft, and one more stronger embedded shortwave
that will support another round of scattered rain showers. A
bit more instability will be in place on Saturday, so a few non-
severe thunderstorms are possible with peak daytime heating.
High temperatures on Saturday will be in the upper 50s to the
lower 60s, which are above record low max temperatures for
Saturday. Frost will also be possible Saturday and Sunday nights
potentially across a larger portion of northeast Minnesota and
northwest Wisconsin, but, will be dependent on cloud cover.

Cyclonic flow aloft will become more zonal Monday into Tuesday
marking a moderation in temperatures back to near normal in the
upper 60s and lower 70s. This will also temporarily reduce the
overnight frost threat as well. The timing and amplitude of the
shortwave on Tuesday, and its associated rain shower and
thunderstorm threat, has some differences across the global
ensemble suites to sort out over the next few days.

&&

.AVIATION /00Z TAFS THROUGH 00Z SUNDAY/...
Issued at 633 PM CDT Fri Sep 5 2025

VFR/MVFR conditions with stratus and scattered rain showers
will continue for a few more hours this evening across most of
northwest Wisconsin and northeast Minnesota. The clouds are
epected to slowly clear from northwest to southeast tonight.
Northwest wind gusts up to 20kts will gradually diminish
through 03z. VFR conditions are forecast on Saturday with
cumulus fields and scattered rain showers and perhaps a few
thunderstorms with peak daytime heating.

&&

.MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/...
Issued at 930 AM CDT Fri Sep 5 2025

Upgraded to a Gale Warning from Port Wing to Sand Island and for
the Outer Apostle Islands today and tonight for northwest wind
gusts to 35 kts and waves of 4 to 8 feet. Elsewhere, a Small
Craft Advisory remains in effect today and into tonight for
wind gusts of 25 to 30 kts, and waves of 1 to 3 feet along the
North Shore and 2 to 5 feet for areas not in the Gale Warning on
the South Shore. There is a 30 to 40 percent chance of Gale
Force wind gusts of 35 to 40kts along the North Shore this
afternoon and evening, especially from Taconite Harbor to Grand
Marais to Grand Portage, with stronger winds off of the
terrain.


For the open water discussion, refer to the NWS Marquette Area
Forecast Discussion at weather.gov/mqt.

&&

.DLH WATCHES/WARNINGS/ADVISORIES...
MN...Frost Advisory from 1 AM to 9 AM CDT Saturday for MNZ010>012-
     018-019.
WI...None.
MARINE...Small Craft Advisory until 5 AM CDT Saturday for LSZ121-140-
     141-147-148.
     Small Craft Advisory until 1 AM CDT Saturday for LSZ142>145.
     Gale Warning until 5 AM CDT Saturday for LSZ146-150.

&&

$$

DISCUSSION...PA
AVIATION...LE
MARINE...PA