🔥 Trending Thunder Bay Weather Forecast: Weekend Outlook and Heatwave Information

As of July 12, 2026, the weather in Thunder Bay, Ontario, Canada, presents a mix of conditions with varying temperatures and precipitation chances over the coming days.

Current and Short-Term Forecast (Next 24 Hours)

For today, Saturday, July 12, 2026, Thunder Bay is experiencing a mix of sun and clouds ⁵. Temperatures are expected to be around 23°C to 24°C, with a "feels like" temperature of 25°C ⁵. Humidity is relatively high at 73%, and there's a low chance of rain, around 20% ⁵. Winds are generally light, coming from the west at about 10 km/h ⁵. The UV index is high, so sun protection is recommended ².

Looking into the evening and overnight, temperatures will drop to around 16°C ⁵. The sky will remain partly cloudy, and the wind will shift to the north-northwest at approximately 10 km/h ⁵.

For tomorrow, Sunday, July 13, 2026, the forecast indicates mostly sunny conditions with temperatures reaching up to 26°C ⁷. The chance of precipitation remains low at around 10% ⁷.

Extended Forecast (Next 3-7 Days)

The weather in Thunder Bay is expected to remain relatively stable for the next few days, with a trend towards warmer temperatures and some chances of rain.

• Monday, July 14, 2026: Temperatures are forecast to be around 27°C with a mix of sun and clouds ³. There's a moderate chance of showers, around 40% ³.
• Tuesday, July 15, 2026: The temperature will be similar, around 26°C, with a higher chance of rain, approximately 60% ⁶.
• Wednesday, July 16, 2026: Temperatures are expected to cool slightly to 22°C, with a continued chance of rain ⁶.

Longer-Term Outlook (Up to 16 Days)

While specific conditions can change, the general outlook for Thunder Bay over the next 10 to 16 days suggests a continuation of summer weather, with temperatures generally in the low to mid-20s Celsius ⁴. There will be periods of sunshine interspersed with chances of rain or showers ⁴. Daily forecasts should be checked for the most up-to-date information as the long-range forecast can be subject to change ⁴.

Key Weather Metrics for Thunder Bay (July 12, 2026)

• Temperature: Currently 23°C - 24°C, "feels like" 25°C ⁵
• Humidity: 73% ⁵
• Wind: West at 10 km/h ⁵
• Precipitation Chance: Low (20% today, 10% tomorrow) ⁵⁷
• UV Index: High ²
• Sunrise: Approximately 5:35 AM EDT ⁸
• Sunset: Approximately 9:55 PM EDT ⁸

For the most immediate and detailed hourly updates, Environment Canada provides a detailed forecast for the next 24 hours ¹.