On August 27, 2026, a federal order directed US agencies to start calling this lake “Lake America.” New York and Canada are keeping “Lake Ontario.” Read what changed

What Is the Lake Ontario (Lake America) Water Temperature Today?

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See the live reading above, pulled from NOAA NDBC Buoy 45012 in the eastern part of the lake. If the buoy's water temperature field is reporting missing, this page shows "data unavailable" instead of an old number.

Source: NOAA NDBC Buoy 45012

Full water temperature page →