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 October 19, 2026 at 19:00 UTC, West Lake Ontario - Grimsby (45139) is reporting water temperature 61°F, air temperature 65°F, wave height 0.3 ft at a 2-second dominant period, wind from the SSE at 2 mph gusting 4 mph, and barometric pressure 30.36 inHg.
- Water temperature
- 61°F
- Air temperature
- 65°F
- Wave height
- 0.3 ft @ 2 s
- Wind
- SSE 2 mph (gust 4)
- Barometric pressure
- 30.36 inHg
Observed October 19, 2026 at 19:00 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
- What is the water temperature at West Lake Ontario?
- Sea surface temperature at West Lake Ontario was 61°F. Measured October 19, 2026 at 19:00 UTC by NOAA station 45139 (West Lake Ontario - Grimsby). NDBC measures this near the surface, at a depth that varies by station.
- What is the air temperature at West Lake Ontario?
- Air temperature at West Lake Ontario was 65°F. Measured October 19, 2026 at 19:00 UTC by NOAA station 45139 (West Lake Ontario - Grimsby).
- What is the wind doing at West Lake Ontario?
- Wind at West Lake Ontario was from the SSE at 2 mph, with peak gusts to 4 mph. Measured October 19, 2026 at 19:00 UTC by NOAA station 45139 (West Lake Ontario - Grimsby). NDBC records wind at the station’s anemometer height, which is not the 10 m height used in marine forecasts.
- What is the barometric pressure at West Lake Ontario?
- Sea-level pressure at West Lake Ontario was 30.36 inHg (1028 hPa). Measured October 19, 2026 at 19:00 UTC by NOAA station 45139 (West Lake Ontario - Grimsby). NDBC reports pressure reduced to sea level rather than the raw reading at the station.
- 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.