July 3, 2026: Thunder Bay Weather Focus — Mainly Cloudy, Warm, and Humid Before a Sunny Stretch

THUNDER BAY – WEATHER – Thunder Bay starts Friday under mostly cloudy skies with a mild and damp early morning feel. At 7:00 AM EDT, the temperature was 16.2°C, with humidity at 91 percent and light west winds. The day will stay mostly cloudy, but temperatures will climb to 27°C, with a humidex near 30 and a very high UV index.
Today’s Weather Overview
Current Conditions
At 7:00 AM EDT, Thunder Bay was reporting mostly cloudy skies and a temperature of 16.2°C. The d