How Warm Is the Water for Snorkeling in Jacó, Costa Rica?

Good news if you run cold: the ocean around Jacó, Costa Rica is warm enough to snorkel in comfortably every single day of the year. There’s no wetsuit, no shivering, and no “just get used to it” moment — you wade into bath-warm water and start looking for fish. Here’s exactly what the water temperature is like for snorkeling near Jacó, and how it changes (barely) through the seasons.

The short answer: high 70s to mid 80s °F, year-round

Jacó sits about 9 degrees north of the equator on Costa Rica’s Central Pacific coast, so the sea here stays tropical-warm all year. Water temperatures typically range from about 78°F to 84°F (26–29°C). That’s squarely in the “no wetsuit needed” zone — most guests snorkel in just a swimsuit, and a lot of people say the water feels like a warm pool.

Does it change with the seasons?

Only a little. Costa Rica doesn’t have a true winter on this coast — it has a dry season (roughly December to April) and a green season (roughly May to November). The air and rainfall change more than the water does. In the green season the sea is, if anything, a touch warmer, and brief afternoon rain doesn’t cool the shallows you’re snorkeling in. In the dry season you get more consistent sun and bright skies. Either way, the water stays comfortably warm — you’re never going to need a thick wetsuit for a half-day snorkel here.

Do you need a wetsuit or rash guard?

You don’t need a wetsuit for warmth. The one thing worth wearing is a rash guard or sun shirt — not for the cold, but for the sun. When you’re floating face-down for over an hour, your back and shoulders are pointed straight at a strong tropical sun, and a light long-sleeve shirt protects you better (and more reliably) than sunscreen alone. If you’d like, read our quick guide on what to wear snorkeling in Jacó.

Warm water is part of why Jacó is so beginner-friendly

Cold water makes people tense up, breathe fast, and cut a snorkel short. Warm, calm water does the opposite — it lets first-timers and kids relax and actually enjoy watching the fish. That’s a big reason the sheltered cove near Playa Mantas works so well for nervous beginners. You can read more about snorkeling if you’re not a strong swimmer, or see what fish you can expect to see.

On a Snorkel Jaco tour you get all the gear, an in-water guide, and photos of your day — about 1.5 hours in the water for $69 per person, with tours at 8am, 10am, and noon. After more than 1,000 tours over four years, warm water is the one thing we’ve never had to apologize for. See what guests say in our reviews.