When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Doha is roughly less than Fredericton. You can assume this to be the case over the next 0 days.
You can imagine temperatures to be in the 42 °C range in June. The weather in Fredericton is generally colder than Doha's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.