In July, Thunder Bay typically sees daytime highs of 23.9°C and overnight lows around 10.3°C. Compared to the annual average high of 8.0°C, July runs +15.9°C.
July in Thunder Bay averages a daytime high of 23.9°C and an overnight low of 10.3°C.
July runs +15.9°C compared to Thunder Bay's annual average high of 8.0°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 23.9°C and cooler evenings around 10.3°C.