Mostly grey clouds linger over Thunder Bay Saturday, with light morning showers possible . The lake keeps shoreline temps cool while clouds stick around. Sunday brings sharp sun breaks inland. waterside breeze lingers than inland areas warm faster. Monday brings sharp temp jumps as the heat wave peaks away from Superior. Lakefront areas see relief while inland spots bake. Local forecasters issued this outlook on July 12, 2026. A sunny Sunday follows the week’s damp start.