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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Scene Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
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Check the live forecast above alongside the Ajax weather buoy data for the most reliable read on Lake Ontario conditions before heading out. The buoy, operated by Environment Canada, gives real-time wave height, wind speed, and water temperature—critical info for boaters and anglers planning a day on the lake.
What does the Ajax weather buoy report?
The buoy measures wind direction and speed, significant wave height, air and water temperature, and barometric pressure. It updates hourly, making it a far better gauge of actual lake conditions than a land-based forecast. For nearby readings, the Port Colborne weather buoy and Grimsby buoy offer similar data for the western and central basin, while the Lake Ontario weather buoy network covers the full shoreline. Anglers also check the Lake Simcoe weather buoy for inland lake conditions, though it is a separate system.
When is the best time to use the buoy data?
Spring and fall are the most variable seasons on Lake Ontario. The buoy becomes essential from April through November, when recreational boating and fishing peak. March-break travellers should note that water temperatures remain near freezing, and the buoy may be removed for winter maintenance. Snowbirds heading south in autumn can compare the Ajax buoy with Windfinder Ajax for wind-surfing and kiteboarding forecasts.
How do I access the Ajax weather buoy data?
View the live buoy report on the Environment Canada marine weather page or through the Canada Scene weather hub. The data is also available via the Weatheradio network and select mobile apps.
Is the Ajax buoy reliable for fishing?
Yes, it is the most accurate source for lake conditions within 10–15 kilometres of shore. Combine its wave-height reading with the Toronto Weather forecast for a complete picture.
What should I pack for a day on Lake Ontario near Ajax?
Even in summer, lake winds can drop temperatures quickly. Bring a windproof jacket, sunscreen, and a VHF radio or smartphone with the buoy feed bookmarked. In spring and fall, add a dry bag and thermal layers.