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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the True North Brief Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The live forecast above shows Mattawa’s current temperature holding in the low minus teens, with intermittent flurries and a northwest breeze. This pattern reflects a stable Arctic air mass settling over the region for the next 48 hours.
What is driving Mattawa’s current weather?
A strong ridge of high pressure centred over northern Ontario is funneling cold continental air into the Mattawa Valley. The live forecast above confirms daytime highs near −12°C with wind chill values approaching −20°C. Cloud cover oscillates as lake-effect bands from Lake Nipissing drift east, producing occasional light snow but no accumulation. This setup is typical for mid-winter and will keep conditions dry and bitter through Wednesday.
What should residents expect in the coming days?
A weakening low pressure system will approach from the Great Lakes by Friday, bringing a 40% chance of snow and slightly warmer air—daytime highs may climb to −6°C. However, overnight lows will plunge back to −18°C. The live forecast above tracks this shift; for a broader regional view, compare with Ottawa weather or check our Canada weather hub. Beyond the weekend, long-range signals suggest a return to seasonal cold, so southeast Ontario towns like Sudbury weather and North Bay weather will see similar trends.
How does Mattawa’s weather compare to nearby cities?
Mattawa sits inland, so winters run colder than the Ottawa Valley but with less lake-effect snow than Barrie weather or Sudbury weather. The live forecast above will most closely match conditions in North Bay, 90 km west.
What is the best time to visit Mattawa for mild weather?
Late August offers highs near 24°C with low humidity. Spring and fall are transitional, and the weather network Mattawa forecast is reliable for day-to-day planning during shoulder seasons.
Does the live forecast above include hourly updates?
Yes, the live forecast above refreshes hourly from Environment Canada, offering current conditions and a mattawa weather hourly outlook. For longer planning, use the mattawa weather 14 days tab on the same tool.