Flights from Thunder Bay to Tucson lean towards being more expensive in December. Prices are generally better when you fly from Thunder Bay to Tucson in August, with the cheapest ticket starting at C$ 289.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Thunder Bay is roughly greater than that of Tucson. You can assume this to be the case over the next 20 days.
We forecast the temperature to be around the 39 °C's in June, on average. The temperature in Tucson is generally hotter than in Thunder Bay. Book flights in a timely manner in correlation to your departure date.