West Lake Ontario - Grimsby (45139) — Live Marine Conditions & Buoy Data
NOAA station 45139, West Lake Ontario - Grimsby, reports real-time marine conditions from 43.250°N, 79.530°W in Lake Ontario. Readings refresh roughly every 10 minutes, and Big Buoy adds a solunar table and a multi-day weather outlook for the area.
Lake Ontario Marine Conditions — West Lake Ontario - Grimsby is one of several stations in Lake Ontario. See live buoy data and solunar for the whole area.
Current conditions at West Lake Ontario - Grimsby
As of August 21, 2026 at 18:00 UTC, West Lake Ontario - Grimsby (45139) is reporting water temperature 73°F, air temperature 72°F, wave height 0.3 ft at a 2-second dominant period, wind from the NE at 9 mph gusting 9 mph, and barometric pressure 30.10 inHg.
- Water temperature
- 73°F
- Air temperature
- 72°F
- Wave height
- 0.3 ft @ 2 s
- Wind
- NE 9 mph (gust 9)
- Barometric pressure
- 30.10 inHg
Observed August 21, 2026 at 18:00 UTC from NOAA NDBC station 45139. Readings update about every 10 minutes.
What NOAA buoy 45139 measures
As a NOAA meteorological station, 45139 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 Ontario
Lake Ontario is deep and steep-sided, so it stratifies strongly in summer and holds cold water below the thermocline while wind-driven upwelling swings surface temperature along the shore. Seas build quickly on a sustained westerly or northeasterly blow — read wind and water temperature together before you go.
Frequently asked questions
- Where is NOAA buoy 45139 located?
- West Lake Ontario - Grimsby (45139) reports from 43.250°N, 79.530°W in Lake Ontario.
- How often is NOAA buoy 45139 updated?
- Station 45139 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 45139 measure?
- Big Buoy shows wind, barometric pressure, air and water temperature, and wave height and period where available for West Lake Ontario - Grimsby, plus solunar peak windows and a multi-day weather outlook.
- Is Big Buoy free to use?
- Yes. Live data for West Lake Ontario - Grimsby 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.