Most of the whale sights are in the summer months from July to August when they are there with their calves.
We have binoculars to watch them. Of course there is always a possibility to spot them all year round but summer time is absolutely the best time. There are also sometimes sunbathing seals at the beach (a bit difficult to spot as they sometimes look like stones from the distance). Best is if you go for a walk at the beach and look for them.