The thickness of the wetsuit you need for the water temperature you’ll be surfing in depends on several factors, including your individual tolerance for cold, the length of your surf sessions, and the type of water activity you’ll be doing. Here are some general guidelines for wetsuit thickness based on water temperature:

1. 75°F and above: A 1-2mm wetsuit top, rash guard, or boardshorts are typically suitable for warm water temperatures.

2. 65°F-75°F: A 2-3mm full wetsuit is generally appropriate for water temperatures in this range. If you’re prone to feeling cold, consider a wetsuit with a thicker torso and thinner arms and legs, such as a 3/2mm.

3. 55°F-65°F: A 4/3mm or 3/2mm full wetsuit is recommended for water temperatures in this range. If the water is closer to 55°F, consider a 5/4mm or 4/3mm hooded wetsuit for added warmth.

4. 45°F-55°F: A 5/4mm or 6/5/4mm hooded wetsuit is recommended for cold water temperatures in this range. Some surfers may also choose to wear boots, gloves, and a hood for added warmth.

5. 45°F and below: A 6/5/4mm or 7/6mm hooded wetsuit is necessary for very cold water temperatures. You should also wear boots, gloves, and a hood to keep your extremities warm.

It’s important to note that these guidelines are not absolute and that everyone has different temperature preferences. If you’re unsure of what wetsuit thickness is appropriate for the water temperature you’ll be surfing in, it’s always best to err on the side of caution and choose a slightly thicker wetsuit.