Hi Dave,
Water temperatures here at the moment are around 23-24 degrees celcius so I would definitely bring your 5mm if you don't want to get cold.
The diving in this area is fantastic, absolutely world class, wherever you have been before you will not be disappointed. The main dive spots in the region are Tofo, Barra and Jangamo and all are within a 45 minute drive from Inhambane, the main hub of the region.
The premium dive site of the area is Manta Reef, which has 3 Manta cleaning stations and an unbeliveable level of reef fish and game fish. Manta Reef is about 20km from Tofo, 30km from Barra and 10km from Jangamo.
Each area also has local reefs which are all spectacular, you will be guaranteed to see lion fish, paper fish, countless nudibranches, many morays and even frog fish if you're lucky.
Visibility is mixed at the moment, sometimes as low as 5m, others up to 20 or 30m. There are not too many whale sharks around right now but they are here, BUT it is a great time of year to see the Humpback whales, which you can often see breaching out in the water from the beach.
Tofo is a great place, has a good backpacker vibe and party scene and is always busy with many divers. I actually manage a PADI 5* Gold Palm dive centre down at Jangamo beach, at Jeff's Palm Resort (jeffsmozdotcom), which is a little bit quieter than Tofo but much less developed and has more of a chilled feel.
I hope you enjoy your diving trip, if you feel like visiting us down here at Jeff's you can drop me a line or give me a call once you get to Inhambane to arrange transport to the resort.
Happy diving!
Mike Kelly
PADI MSDT #498052
Manager
Jeff's Pro Dive Centre
Praia de Jangamo
Inhambane, Mozambique
Email: mikekelly1980atgmail.com
Tel: +258 84 239 1100