At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Prestwick and Sarnia for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Prestwick is roughly greater than that of Sarnia. You can assume this to be the case over the next 7 days.
We forecast the temperature to be around the 25 °Cs in July, on average. The temperature in Sarnia is generally hotter than in Prestwick. Book flights in a timely manner in correlation to your departure date.