Marine forecast
St. Joseph to South Haven, MI
- current wind
- 6 kt SSW
- Gusts
- 8 kt
- Seas
- 1.6 ft
- Period
- 4 sec
- Air
- 64°F
Observed Tue 3:00 PM | LMZ844
- Gusts now
- 8 kt
- Seas now
- 1.6 ft · 4 sec
- Air
- 64°F
- Water
- 62°F
- 72-hr peak
- 35 kt
In brief
At 3:00 pm EDT on Oct 13, 2026, NDBC station 45168 (South Haven Buoy, MI, 8 miles away) measured wind from the SSW at 6 kt, gusting to 8 kt, with seas of 1.6 ft. The NWS forecast for St. Joseph to South Haven, MI issued at 2:11 pm EDT on Oct 13, 2026 reads, for through early evening: “West winds 5 to 15 knots. Sunny.”
Source: National Weather Service Grand Rapids MI forecast; NDBC observations
Wind forecast · ktPeak 35 kt
Seas forecast · ftPeak 15 ft
NWS marine forecast
| Period | Forecast |
|---|---|
| Through Early Evening | West winds 5 to 15 knots. Sunny. Waves 2 to 4 feet. |
| Tonight | North winds around 5 knots veering northeast after midnight. Mostly clear in the evening then becoming mostly cloudy. A chance of rain showers and a slight chance of thunderstorms. Waves 1 to 2 feet. |
| Wednesday | Northeast winds 5 to 15 knots backing north 15 to 20 knots early in the afternoon. Partly sunny with a slight chance of rain showers. Waves 1 to 3 feet. |
| Wednesday Night | Northeast winds 10 to 20 knots veering east after midnight. Partly cloudy. Waves 2 to 4 feet. |
| Thursday | East winds 10 to 15 knots. Mostly cloudy with rain showers likely. Waves 1 to 2 feet. |
| Thursday Night | East winds around 10 knots backing northwest 10 to 20 knots in the late evening and early morning, then increasing to gales to 35 knots after midnight. Rain showers likely. Waves 1 to 2 feet building to 5 to 7 feet after midnight. |
| Friday | Northwest gales to 45 knots. Partly sunny with a chance of rain showers. Waves 13 to 17 feet building to 16 to 20 feet early in the afternoon. |
| Saturday | North winds 10 to 20 knots backing west early in the afternoon. Sunny. Waves 6 to 9 feet subsiding to 3 to 5 feet early in the afternoon. |
| Sunday | Southwest winds 15 to 25 knots. Sunny. Waves 3 to 5 feet. |
Issued Tue 2:11 PM by Grand Rapids MI (product NSHGRR).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 3:00 PM | 6 kt SSW | 8 kt | 1.6 ft | 62°F |
| Tue 2:50 PM | 8 kt S | 8 kt | 1.6 ft | 62°F |
| Tue 1:50 PM | 6 kt S | 6 kt | 1.6 ft | 61°F |
| Tue 12:50 PM | 12 kt S | 14 kt | 2.0 ft | 61°F |
| Tue 11:50 AM | 10 kt S | 12 kt | 2.3 ft | 61°F |
| Tue 10:50 AM | 14 kt S | 18 kt | 2.6 ft | 60°F |
| Tue 9:50 AM | 14 kt S | 18 kt | 3.0 ft | 60°F |
| Tue 8:50 AM | 14 kt S | 18 kt | 3.0 ft | 60°F |
| Tue 7:50 AM | 16 kt S | 18 kt | 3.6 ft | 60°F |
| Tue 6:50 AM | 16 kt S | 19 kt | 3.6 ft | 60°F |
| Tue 5:50 AM | 16 kt S | 19 kt | 3.6 ft | 60°F |
| Tue 4:50 AM | 16 kt S | 19 kt | 3.0 ft | 60°F |
Observed Tue 3:00 PM at NDBC buoy 45168 (South Haven Buoy, MI), 8.0 miles away.
Frequently asked questions
What is the marine forecast for St. Joseph to South Haven today?
Through Early Evening: West winds 5 to 15 knots. Sunny. Waves 2 to 4 feet.
Is there a small craft advisory for St. Joseph to South Haven?
No advisories, warnings or watches are in effect for NWS zone LMZ844 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 St. Joseph to South Haven right now?
Seas are running 1.6 ft at a 4-second period, measured at NDBC buoy 45168 Tue 3:00 PM, 8.0 miles from this zone. The forecast peaks at 15.0 ft Fri 3 PM.
What is the water temperature at St. Joseph to South Haven?
The nearest buoy read 62°F (16°C) at Tue 3:00 PM. Sea surface temperature at a single buoy can differ by several degrees from the water at a beach or in a shallow bay nearby.
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 LMZ844, issued by Grand Rapids MI, 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 NSHGRR, issued Tue 2:11 PM. Observations: NOAA National Data Buoy Center station 45168, read Tue 3:00 PM. Retrieved Oct 13, 3:42 PM. Conditions offshore change faster than any page can be rebuilt, so check the current NWS bulletin and your own instruments before going out.