If it's shot at around 65 degrees, and not sunny, do you still have to water it for 7 days?
It is always best to.
Air draws the moisture out. The moisture is needed for the chemical reactions taking place. Failing to wet it down will result in the moisture further in the concrete to be drawn to towards the surface, weakening the entire concrete thickness.
Here is an old article that puts it into simple laymans terms, and explains the process.
Here is a link that might be useful: Concrete curing