Thanks for getting in touch, we do have a tour that offers a great chance to see Whales off the coast of South Africa at Hermanus -

"Today we have a leisurely drive along the Garden Route to the town of Hermanus. The Garden Route visits include Plettenberg Bay, Tsitsikamma National Park and Bloukrans Bridge currently offering the highest bungy jump in the world! At Hermanus between July and October, southern right whales can be seen in the waters here with their young. During the whale season we will make a stop to observe these beautiful mammals. Enjoy free time to explore Hermanus. Later this afternoon we will head to our hotel. Dinner is included at your hotel this evening."

The tour can be found here:

http://www.justyou.co.uk/destinations/africa/southern-africa/south-africa/south-african-explorer/ 

I hope this helps and if you have any further questions please ask,

Kindest,

Ben