When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Darwin is roughly greater than that of Sharm El Sheikh. You can assume this to be the case over the next 23 days.
Temperatures around the 37 °Cs can be experienced in July. The weather in Sharm El Sheikh is hotter than in Darwin. Plan for potential changes in flight availability as peak weather approaches in this location.