Thunder Bay, Weather – This Friday morning, Lake Superior is making her presence known in Thunder Bay with a cool, humid start. With temperatures hovering near 12°C under mostly clear skies, it’s a refreshing and calm start — but warmer, more humid air will build through the weekend, along with a risk of showers and storms by Saturday afternoon.

Current Conditions (as of 6:00 AM EDT – Thunder Bay Airport)

• 🌡️ Temperature: 11.6°C

• 🌤️ Condition: Mainly Clear

• 💧 Dew Point: 11.4°C

• 💦 Humidity: 99% — fog or mist possible

• 🌬️ Wind: West-northwest at 5 km/h

• 📉 Pressure: 101.1 kPa and falling

• 👁️ Visibility: 32 km

Friday, July 11

• 🌤️ Mix of sun and cloud, becoming more humid by afternoon

• 🌧️ 30% chance of showers in the afternoon with risk of a thunderstorm

• 🌡️ High: 27°C

• 💧 Humidex: 34 — feels much warmer than it is

• 🌞 UV Index: 8 (Very High)

• 🌙 Night: Showers likely

  • Low: 15°C

Saturday, July 12

• 🌥️ Mix of sun and cloud

• 🌧️ 60% chance of showers, especially in the morning and early afternoon

• 🌡️ High: 25°C

• 🌙 Night: Cloudy periods with 30% chance of showers

  • Low: 13°C

Sunday, July 13

• 🌤️ A brighter day ahead

• 🌧️ 30% chance of showers, mainly in the afternoon

• 🌡️ High: 28°C

• 🌙 Night: Cloudy periods with a 40% chance of showers

  • Low: 16°C

Monday, July 14

• 🌤️ Mix of sun and cloud

• 🌡️ High: 25°C

• 🌙 Night: Cloudy periods, 40% chance of showers

  • Low: 15°C

Wardrobe & Activity Tips

• Friday: Start with a light jacket or hoodie in the morning, then switch to breathable summer clothing by midday. Keep an umbrella handy in the afternoon.

• Saturday: Good day for indoor plans or flexible outdoor activities — light rain gear recommended.

• Sunday: Warm and mostly dry — great day for the beach or trail, but keep your eye on the sky later in the day.

Lake Superior Fact 🌊

Did you know?
Lake Superior can lower summer morning temperatures in Thunder Bay by up to 8–10°C, especially when winds come from the north or northeast. That’s why today’s 12°C feels more like early spring than mid-July — classic lake breeze effect!