Is a hamam a good rainy-day activity in Istanbul?
It is an indoor option for a wet day. Reserve a slot and allow time for the journey; rainy weather does not guarantee same-day availability.

Related questions
How can I combine Sultanahmet sightseeing with a hamam?
Group nearby sights and leave a separate appointment window. For Golden Royal, use the address on Peykhane Sokak rather than a generic “Sultanahmet hamam” map result.
What should I pack for a Turkish bath?
Pack swimwear if required, fresh underwear and personal toiletries. Ask whether towels and non-slip footwear are supplied; leave unnecessary valuables at your hotel.
How do I choose a date and time for my hamam?
Select your preferred date in the form and tell the team your preferred time when contacted. Wait for the agreed slot before making fixed plans around it.