Marine forecast
Grand Portage to Grand Marais, MN
- current wind
- 10 kt WSW
- Seas
- 2.6 ft
- Period
- 6 sec
- Air
- 47°F
- 72-hr peak
- 21 kt
Observed Tue 1:56 PM | LSZ140
- Seas now
- 2.6 ft · 6 sec
- Air
- 47°F
- 72-hr peak
- 21 kt
In brief
At 1:56 pm CDT on Oct 13, 2026, NDBC station KGNA (Bay of Grand Marais, MN, 25 miles away) measured wind from the WSW at 10 kt; buoy 45023 measured seas of 2.6 ft. The NWS forecast for Grand Portage to Grand Marais, MN issued at 2:22 pm CDT on Oct 13, 2026 reads, for tonight: “Northwest wind 5 to 10 knots. Mostly cloudy.”
Source: National Weather Service Duluth MN forecast; NDBC observations
Wind forecast · ktPeak 21 kt
NWS marine forecast
| Period | Forecast |
|---|---|
| Tonight | Northwest wind 5 to 10 knots. Mostly cloudy. Waves 1 to 2 feet. |
| Wednesday | Northwest wind 5 to 10 knots. Partly sunny. Waves 1 foot or less. |
| Wednesday Night | North wind 5 knots becoming northeast after midnight, then becoming southeast early in the morning. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 foot or less. |
| Thursday | South wind 10 to 15 knots with gusts to around 20 knots becoming southwest with gusts to around 20 knots late in the afternoon. Slight chance of rain showers in the morning, then chance of rain showers in the afternoon. Waves 1 to 2 feet. |
Issued Tue 2:22 PM by Duluth MN (product NSHDLH).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 1:56 PM | 10 kt WSW | — | — | — |
| Tue 12:56 PM | 8 kt WSW | — | — | — |
| Tue 11:56 AM | 6 kt WSW | — | — | — |
| Tue 10:56 AM | 4 kt SW | — | — | — |
| Tue 9:56 AM | 3 kt | — | — | — |
| Tue 8:56 AM | 4 kt N | — | — | — |
| Tue 7:56 AM | 6 kt N | — | — | — |
| Tue 6:56 AM | 4 kt | — | — | — |
| Tue 5:56 AM | 7 kt NNE | — | — | — |
| Tue 4:56 AM | 5 kt NNE | — | — | — |
| Tue 3:56 AM | 5 kt | — | — | — |
| Tue 2:56 AM | 0 kt | — | — | — |
Observed Tue 1:56 PM at NDBC buoy KGNA (Bay of Grand Marais, MN), 24.9 miles away. Seas from buoy 45023 (North Entry Buoy, North Keweenaw Peninsula, MI), 71.1 miles away, at Tue 1:40 PM.
Frequently asked questions
What is the marine forecast for Grand Portage to Grand Marais today?
Tonight: Northwest wind 5 to 10 knots. Mostly cloudy. Waves 1 to 2 feet.
Is there a small craft advisory for Grand Portage to Grand Marais?
No advisories, warnings or watches are in effect for NWS zone LSZ140 as of the last update on this page. Advisories can be issued at any time; check the current bulletin before leaving the dock.
How high are the waves at Grand Portage to Grand Marais right now?
Seas are running 2.6 ft at a 6-second period, measured at NDBC buoy KGNA Tue 1:56 PM, 24.9 miles from this zone.
What do the wind speeds in knots mean?
One knot is 1.15 mph. The National Weather Service issues a small craft advisory for sustained winds of roughly 22–33 knots or hazardous seas, a gale warning at 34–47 knots, and a storm warning at 48 knots and above. Exact advisory thresholds vary by forecast office and by water body — a bay reaches dangerous chop at a lower wind speed than open ocean.
Where does this forecast come from?
The forecast text is the National Weather Service's own marine bulletin for zone LSZ140, issued by Duluth MN, reproduced in full. The wind and seas charts are drawn from the NWS gridded forecast for a point inside the zone. Observations come from the nearest reporting NDBC buoy. We are not affiliated with NOAA or the National Weather Service.
Forecast: NOAA/NWS product NSHDLH, issued Tue 2:22 PM. Observations: NOAA National Data Buoy Center station KGNA, read Tue 1:56 PM. Retrieved Oct 13, 2:42 PM. Conditions offshore change faster than any page can be rebuilt, so check the current NWS bulletin and your own instruments before going out.