What you will need
You will want waterproofs and warm clothing for boating, it can get very cold out on the water, you may even want a woolly hat.
Even
if it is sunny it can still be cold so you will still need your
waterproofs and warm clothing, plus it is advisable to wear a sun hat.
Don't forget that you, plus the clothes and shoes you are wearing, could get wet! Bring a towel!