textproduct: Duluth

KEY MESSAGES

- Near-normal temperatures for August are expected through this week.

- There are chances for rain showers and non-severe storms about every other day.

UPDATE

Issued at 232 AM CDT Mon Aug 10 2026

Fog is developing across portions of the Northland, mainly in our typical low-lying areas and river valleys. Visibility will improve after sunrise, giving way to a pleasant August day. Skies should be mostly sunny, with afternoon highs in the mid 70s to mid 80s. Skies may appear hazy due to elevated wildfire smoke drifting across the area.

Much of this week we will have persistent west-northwest flow across the region aloft, and weak systems diving through the region will bring periodic chances for showers and storms. The first of these should move through tonight, bringing a small chance for mainly showers with isolated storms tonight into early Tuesday. Tuesday will remain warm, with highs once again in the mid 70s to mid 80s.

A stronger wave will bring higher chances for showers and storms Tuesday night into Wednesday morning. Wednesday will be cooler, with cloud cover helping to keep high temperatures in the 70s to low 80s.

This pattern of northwest flow aloft continues through the remainder of the week with a stalled frontal boundary parked well to our south. This will keep temperatures near normal for mid-August, featuring daytime highs in the 70s to lower 80s. Overnight lows will be pleasantly cool, dropping into the 40s and 50s. We will also see a persistent pattern of weak disturbances passing through every couple of days.

DISCUSSION

Issued at 129 PM CDT Sun Aug 9 2026

For the rest of the day, mainly widely scattered rain showers and possibly (10-20% chance only) an isolated non-severe thunderstorm are forecast this afternoon for inland northwest Wisconsin. The main hazard if any non-severe storm could come to be would be a quick burst of localized heavy rainfall and cloud to ground lightning. Meanwhile, smoke aloft departs slowly to the southeast with some blue skies returning into this afternoon across the Northland. Quiet conditions take over tonight as temperatures dip slightly below normal under light winds. However, the next round of smoke aloft moves in tonight and sets up for Monday.

This incoming smoke layer will be creating sky cover for areas south of US Highway 2 throughout the day on Monday. Aside from the hazy skies, Monday will feature pleasant conditions with near-normal daytime high temperatures climbing into the upper 70s to lower 80s across the area. Humidity levels will drop a bit, creating a comfortable feel for mid-August. Light variable winds in the morning will eventually turn toward the west and northwest during the afternoon hours.

Heading into the rest of the week, a persistent northwest flow aloft continues as a stalled frontal boundary to our south keeps us on the cooler side. This northwest flow continues to create near- normal daytime high temperatures in the 70s to lower 80s, and slightly below normal low temperatures each night falling into the mid 40s to lower 50s.

Within this northwest flow will be weak and small-scale disturbances helping create the off-and-on mainly rain shower with embedded non-severe thunderstorm chances every 36 to 48 hours. Any showers and storms would likely be very localized and short-lived in nature from this setup of shear, moisture and instability-limited environmental progs in longer-range ensemble guidance.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/

Issued at 1252 PM CDT Mon Aug 10 2026

VFR conditions are expected until early Tuesday morning when fog may develop at HIB and HYR.

MARINE /FOR NEARSHORE WATERS OF WESTERN LAKE SUPERIOR/

Issued at 232 AM CDT Mon Aug 10 2026

Winds across western Lake Superior are expected to increase out of the southwest today, but still only 5 to 10 knots with gusts up to 15 knots, with waves of 1 foot or less. Winds become light and variable overnight before becoming northeast on Tuesday around 5 to 10 knots, though gusts of 10 to 15 knots are possible. Waves will remain 1 foot or less. No showers or storms are expected today, but showers are possible tonight into Tuesday. Thunderstorm chances return Tuesday night into Wednesday.

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

FIRE WEATHER

Issued at 232 AM CDT Mon Aug 10 2026

A slightly drier airmass moves into the region today with minimum relative humidity values dropping into the 35 to 45 percent range. West to northwest winds of 5 to 10 mph is expected today. By Tuesday, moisture beginning to move back into the area will bring the minimum RH values of 40 to 50 percent with northwest winds of 5 to 10 mph. A pattern of periodic non- severe thunderstorms will return every 36 to 48 hours this week, bringing localized wetting rains.

See the Fire Weather Forecast product for a more thorough breakdown of fire weather conditions.

DLH WATCHES/WARNINGS/ADVISORIES

MN...None. WI...None. MARINE...None.