Grand Traverse Light, MI (GTLM4) — Live Marine Conditions & Buoy Data
NOAA station GTLM4, Grand Traverse Light, MI, reports real-time marine conditions from 45.211°N, 85.550°W in Lake Michigan (Michigan). Readings refresh roughly every 10 minutes, and Big Buoy adds a solunar table and a multi-day weather outlook for the area.
Current conditions at Grand Traverse Light, MI
As of August 21, 2026 at 19:40 UTC, Grand Traverse Light, MI (GTLM4) is reporting air temperature 74°F, wind from the W at 8 mph gusting 10 mph, and barometric pressure 29.98 inHg.
- Air temperature
- 74°F
- Wind
- W 8 mph (gust 10)
- Barometric pressure
- 29.98 inHg
Observed August 21, 2026 at 19:40 UTC from NOAA NDBC station GTLM4. Readings update about every 10 minutes.
What NOAA buoy GTLM4 measures
As a NOAA meteorological station, GTLM4 reports wind speed, gusts and direction, barometric pressure, air and water temperature, and — where wave sensors are fitted — significant wave height, swell period, and wave direction.
What to watch in Lake Michigan
Lake Michigan’s long north-south axis lets a sustained northerly or southerly wind build large, steep seas over its full fetch, sometimes within hours. Summer stratification is sharp and wind-driven upwelling can swing nearshore water temperature 15–20°F in a day, so watch wind direction and buoy temperatures together.
Frequently asked questions
- Where is NOAA buoy GTLM4 located?
- Grand Traverse Light, MI (GTLM4) reports from 45.211°N, 85.550°W in Lake Michigan (Michigan).
- How often is NOAA buoy GTLM4 updated?
- Station GTLM4 typically reports new observations about every 10 minutes. Big Buoy refreshes continuously so you always see the latest readings, alongside a solunar table for the area.
- What does NOAA buoy GTLM4 measure?
- Big Buoy shows wind, barometric pressure, air and water temperature, and wave height and period where available for Grand Traverse Light, MI, plus solunar peak windows and a multi-day weather outlook.
- Is Big Buoy free to use?
- Yes. Live data for Grand Traverse Light, MI and every other NOAA buoy is free with no account required. Big Buoy Pro adds the Wind Tab, the Depth Chart, satellite overlays (sea surface temp, chlorophyll, currents), 16-day forecasts, and forecast model switching.