Marine forecast
Green Bay: Cedar River–Rock I. Offshore, WI
- current wind
- 6 kt W
- Gusts
- 11 kt
- Seas
- 2.6 ft
- Period
- 5 sec
- Air
- 60°F
Observed Tue 2:00 PM | LMZ521
- Gusts now
- 11 kt
- Seas now
- 2.6 ft · 5 sec
- Air
- 60°F
- Water
- 62°F
- 72-hr peak
- 28 kt
In brief
At 2:00 pm CDT on Oct 13, 2026, NDBC station MNMM4 (Menominee, MI, 9 miles away) measured wind from the W at 6 kt, gusting to 11 kt; buoy 45210 measured seas of 2.6 ft. The NWS forecast for Green Bay: Cedar River–Rock I. Offshore, WI issued at 1:56 pm CDT on Oct 13, 2026 reads, for this afternoon: “NW wind 10 to 15 kts. Waves 2 ft or less.”
Source: National Weather Service Green Bay WI forecast; NDBC observations
Wind forecast · ktPeak 28 kt
Seas forecast · ftPeak 5 ft
NWS marine forecast
| Period | Forecast |
|---|---|
| This Afternoon | NW wind 10 to 15 kts. Waves 2 ft or less. Mostly cloudy. |
| Tonight | N wind 5 to 10 kts. Waves 2 ft or less. Mostly cloudy. |
| Wednesday | N wind 10 to 15 kts veering NE 5 to 10 kts early in the afternoon. Waves 2 ft or less. Partly sunny. |
| Wednesday Night | NE wind 10 to 15 kts. Waves 2 ft or less. Mostly cloudy. |
Issued Tue 1:56 PM by Green Bay WI (product NSHGRB).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 2:00 PM | 6 kt W | 11 kt | — | 62°F |
| Tue 1:54 PM | 7 kt W | 11 kt | — | 62°F |
| Tue 12:54 PM | 7 kt W | 13 kt | — | 62°F |
| Tue 11:54 AM | 8 kt WNW | 14 kt | — | 62°F |
| Tue 10:54 AM | 8 kt WNW | 13 kt | — | 62°F |
| Tue 9:54 AM | 12 kt WNW | 18 kt | — | 62°F |
| Tue 8:54 AM | 6 kt WNW | 9 kt | — | 62°F |
| Tue 7:54 AM | 6 kt NW | 8 kt | — | 62°F |
| Tue 6:54 AM | 5 kt WNW | 6 kt | — | 62°F |
| Tue 5:54 AM | 7 kt NW | 9 kt | — | 62°F |
| Tue 4:54 AM | 4 kt NNW | 6 kt | — | 62°F |
| Tue 3:54 AM | 7 kt N | 9 kt | — | 62°F |
Observed Tue 2:00 PM at NDBC buoy MNMM4 (Menominee, MI), 9.1 miles away. Seas from buoy 45210 (Rawley Point East, WI (269)), 71.8 miles away, at Tue 1:56 PM.
Frequently asked questions
What is the marine forecast for Green Bay: Cedar River–Rock I. Offshore today?
This Afternoon: NW wind 10 to 15 kts. Waves 2 ft or less. Mostly cloudy.
Is there a small craft advisory for Green Bay: Cedar River–Rock I. Offshore?
No advisories, warnings or watches are in effect for NWS zone LMZ521 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 Green Bay: Cedar River–Rock I. Offshore right now?
Seas are running 2.6 ft at a 5-second period, measured at NDBC buoy MNMM4 Tue 2:00 PM, 9.1 miles from this zone. The forecast peaks at 5.0 ft Fri 7 AM.
What is the water temperature at Green Bay: Cedar River–Rock I. Offshore?
The nearest buoy read 62°F (17°C) at Tue 2:00 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 LMZ521, issued by Green Bay WI, 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 NSHGRB, issued Tue 1:56 PM. Observations: NOAA National Data Buoy Center station MNMM4, read Tue 2:00 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.