June 1, 2026: Thunder Bay Weather Focus — Cool Sunny Start, Frost Risk Tonight
Thunder Bay, Ontario — Thunder Bay weather for June 1, 2026: Mainly sunny and cool at 5. Thunder Bay weather for June 1, 2026: Mainly sunny and cool at 5.3°C this morning, warming to 18°C with very high UV THUNDER BAY – WEATHER – Thunder Bay is starting June with a crisp, mainly sunny morning and very light winds. The…