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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Perspective Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Check the live forecast above before heading out in Tottenham today, as conditions in this Simcoe County community can shift quickly with the Holland Marsh lowlands to the east and the Oak Ridges Moraine to the south.
What makes Tottenham’s weather distinct from the Greater Toronto Area?
Tottenham sits roughly 60 kilometres northwest of downtown Toronto, but its inland position away from Lake Ontario means overnight lows often run a few degrees cooler and summer afternoons can feel noticeably warmer. The Holland Marsh, a major agricultural basin just east of town, adds moisture to the air and can produce patchy fog along Highway 9 during spring and autumn mornings. For a broader look at conditions across the region, visit the Toronto Weather page.
How reliable are 14-day outlooks for planning in Tottenham?
Extended forecasts—such as the Tottenham Ontario weather 14 day forecast you might find on the Tottenham weather network or via AccuWeather Tottenham Ontario—offer a useful trend but lose confidence beyond day seven. The Tottenham weather 14 day forecast AccuWeather style of outlook works best as a general guide; for concrete decisions, refer to the live forecast above and check again the morning of your planned activity. For severe weather alerts, bookmark the Weather Warning page.
Does Tottenham get more snow than Toronto?
Yes, typically. Tottenham’s inland location and proximity to the Oak Ridges Moraine often produce slightly higher snowfall totals than downtown Toronto, though lake-effect bands from Georgian Bay can boost amounts further north in Simcoe County.
What causes fog along Highway 9 near Tottenham?
Radiational cooling over the Holland Marsh, combined with moisture from the peaty soil and drainage canals, creates dense fog on calm, clear nights. This is most common in late summer and early autumn, reducing visibility sharply until mid-morning.
When do frost warnings typically begin in the fall?
Frost advisories from Environment Canada usually start in late September for Tottenham, with the first hard frost often arriving by mid-October. Gardeners in the Holland Marsh area should monitor the live forecast above and the Canada weather hub for local alerts.