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Widespread 20°C temperature readings are possible on Thursday as well, as a low-pressure system developing arcs north. Some places will likely hit 20°C back-to-back-to-back, particularly up the 401 in eastern Ontario.
Remember how warm the start of October was? Keep in mind, that Ottawa and most of southern Ontario just see a few days above 20°C in October. Most regions are at 6 days, with the potential to tack on a couple more this week.
Make the most of this warm-up, as copious amounts of Arctic air are draining across the Prairies this week. There’s a huge amount of uncertainty when that cold air oozes across Ontario next weekend, but if you’re planning Halloween costumes, go for a warmer option.
Stay tuned to The Weather Network for more forecast updates for southern Ontario.