When is the quietest time to visit SEA LIFE Weymouth? We are generally quieter on off peak weekdays during school term time, but this can vary day to day. To guarantee you entry and receive priority admission, pre-book here. Related articles When is SEA LIFE Weymouth open? When is the Splash Zone and Pool open? Is Jurassic Skyline open? How can I use my 2-4-1/ Promotional voucher online? What does my ticket include?