[ad_1] THUNDER BAY – WEATHER DESK – Thunder Bay is waking up to a damp and mild Sunday morning, with spring continuing its slow transition toward summer. While today brings clouds, the possibility of showers, and even a late-day thunderstorm risk, residents can also look ahead to a major warm-up arriving by midweek. It feels very close with the humidity at 97%. You won’t need gloves but you will appreciate that you are wearing a windbreaker and fleece jacket. At 8:00 AM EDT, Thunder Bay Airport reported a temperature of 7.9°C with very moist air across the region. Current conditions include: Temperature: 7.9°C Humidity: 97% Dew Point: 7.4°C Wind: West 4 km/h Pressure: 101.5 kPa Visibility: Moist conditions with fog patches lingering in some areas The near-saturated humidity levels explain the damp morning feel across the city, while weak winds are allowing lingering low cloud and patchy fog to slowly clear. Today’s Weather Overview Sunday will feature mainly cloudy skies with a 40 percent chance of showers early this morning and again late this afternoon. Forecasters are also tracking a risk of thunderstorms developing late this afternoon, so anyone planning outdoor activities should keep an eye on changing skies. Fog patches will dissipate through the morning. Forecast High 20°C UV Index 5 – Moderate For late May in Thunder Bay, this is a fairly typical spring setup — moisture, instability, and fluctuating temperatures battling for control. Tonight – Fog Returns Tonight will turn partly cloudy with lingering weather risks early. 40 percent chance of showers early this evening Risk of a thunderstorm early tonight Fog patches redevelop after midnight Overnight Low 5°C Motorists heading out late tonight or early Monday morning should prepare for reduced visibility in localized fog areas. Monday Forecast – Another Storm Chance Before Sunshine Takes Over Monday continues the unsettled trend. Expect mainly cloudy skies with a 40 percent chance of afternoon showers and another risk of thunderstorms late in the day. Morning fog patches will clear. Monday High 22°C UV Index 7 – High Monday night remains mild. Cloudy periods 30 percent chance of showers Low 8°C Extended Forecast – Summer Finally Knocking on Thunder Bay’s Door Tuesday, May 26 ☀️ SunnyHigh 27°CLow 7°C Wednesday, May 27 ☀️ SunnyHigh 23°CLow 8°C Thursday, May 28 ☀️ SunnyHigh 25°CLow 8°C Friday, May 29 ☀️ SunnyHigh 23°CLow 6°C Saturday, May 30 ☀️ SunnyHigh 24°C After weeks of what often felt more like April than late May, Thunder Bay appears poised for a much-needed stretch of spring warmth. Lake Superior Marine Weather Outlook Boaters on western Lake Superior should remain alert for changing conditions today and Monday. Patchy fog early today may reduce visibility near shorelines and harbour areas. Thunderstorm development late Sunday and Monday could also bring sudden gusty winds and rapidly changing wave conditions. Calmer and more stable marine weather arrives Tuesday into the latter half of the week as high pressure settles across Northwestern Ontario. Wardrobe Recommendations Today: Light layers and a waterproof jacket remain smart choices. Keep rain gear handy if spending extended time outdoors. Monday: Similar conditions — comfortable but variable. Tuesday onward: Sunglasses, sunscreen, and lighter summer clothing may finally become the go-to choices. Weather Trivia Thunder Bay’s location beside Lake Superior often delays spring warming compared to inland Northwestern Ontario communities. Cold lake water acts like nature’s air conditioner well into May and sometimes June — one reason why inland communities can reach summer temperatures while the shoreline remains significantly cooler. Overview Thunder Bay Weather Desk Update for May 24, 2026: Showers and thunderstorm risks continue Sunday and Monday before sunshine and summer warmth arrive with highs reaching 27°C. [ad_2] Source link
