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Lake Ontario water temperature

Lake Ontario, Sodus Point Nearshore Monitoring · Lake

The current water temperature at Lake Ontario is 23.0 °C (as of July 30, 2026, source: GLOS).

Lakes stratify in summer: bathing-warm on top, markedly colder a few metres down. Measurements are taken at the surface — right where you swim.

23.0 °C
Measured: July 30, 2026 · continuously updated
💧 Water 23.0° · ☀️ Air 16.5° · high today 18.4°
Temperature trend of recent weeks
Lake Ontario
Photo: DanielPenfield · CC BY-SA 4.0 · Wikimedia Commons

Nearby waters

Lake Ontario, Sodus Point, NY · 1.5 km away21.0 °CLake Ontario, Oswego, NY (274) · 39.3 km away21.1 °CLake Ontario, Oswego · 42.5 km away20.5 °CIrondequoit Creek above Blossom Rd near Rochester, New York · 47.2 km away16.1 °CAllen Creek near Rochester, New York · 49.0 km away16.2 °C

More measuring points: Lake Ontario

Niagara-on-the-Lake (ECCC)21.8 °COswego, NY (274)21.1 °CSodus Point, NY21.0 °CWolfe Island (ECCC)20.6 °COswego20.5 °CCape Vincent20.2 °C

Frequently asked questions

Can you swim at Lake Ontario right now?
The current water temperature is 23.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Lake Ontario?
Currently 23.0 °C (updated continuously).

Open in the BrrChecker app

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