Welcome at Prince Arthurs Landing THUNDER BAY – WEATHER – Monday, September 14, 2026 – The weather in Thunder Bay over the next three days will include sunshine, some overnight showers, and a breezy Tuesday before clear skies return on Wednesday. This forecast for September 14-16 is based on Environment Canada’s updates released at 5:30 a. m. EDT on September 14.
Monday, September 14: Sunny Start with Evening Showers
The day begins with sunshine, but expect a mix of sun and clouds by this afternoon. South winds will pick up to 20 km/h, with gusts reaching up to 40 km/h. The temperature will reach a high of 18°C, accompanied by a moderate UV index of 5. Tonight’s showers could bring about 10-15 mm of rain before tapering off by morning. There’s still a 40 percent chance of lingering showers afterward. Southeast winds that gust up to 40 km/h will shift to southwest after midnight. The low tonight is expected to be around 11°C.Tuesday, September 15: Blustery Conditions
Look for mainly cloudy skies tomorrow along with a 40 percent chance of rain. Southwest winds will gust up to 50 km/h initially and then switch to west at around 40 km/h, potentially reaching gusts of up to 70 km/h later in the morning. The high temperature is forecasted to be around 18°C, with a moderate UV index sitting at about 3.Wednesday, September 16: Clear Skies Ahead
The night leading into Wednesday should be clear with lows dropping down to about 7°C. Expect plenty of sunshine on Wednesday along with highs reaching around 19°C. Cloud cover is expected again Wednesday night with another chance for showers at about 40 percent and lows near 10°C.Your Plans This Week
The strong wind gusts predicted for Tuesday are worth noting. Make sure you secure any outdoor items like bins or patio furniture ahead of time. Drivers operating trucks or towing trailers should also stay cautious due to potential crosswinds in open areas. If you’re heading out Monday evening or Tuesday, it’s smart to have your rain jacket ready. However, Wednesday looks much better for outdoor plans. This report doesn’t guarantee highway closures. For the latest road conditions and updated forecasts or alerts, please check Ontario 511 and Environment and Climate Change Canada prior to traveling.Source link
