We recommend a dry suit or minimum 7 mm suit and hood from December until the end of April. You will certainly need a coat and long trousers for the night time. If you are using a semi-dry or wetsuit, it’s best to also bring a windcheater or waterproof coat to stop the windchill between the dives.
Once May has arrived the temperatures are picking up and I am happy in a 7 mm wetsuit and it is normally warm enough when you are out not to get chilled between dives. It’s still advisable to bring a fleece for the night time.
I typically wear a 5mm suit from July to the end of September although people who are used to colder weather often use a 3 mm suit. October is one of my favourite months it is not too hot when we are suited up and the water is still nice and warm. By mid November it can get a bit chilly between dives if its cloudy or a bit windy and I’m certainly reaching for my semi-dry or drysuit, not because the water is too cold – just to avoid the wind chill between dives. A coat and long trousers are best for the night and some days too, although we have has the odd day in shorts and t-shirts in December.