What Water Temperature Is Good for Snorkeling?
Most people snorkel comfortably in water between 20 and 30°C (68–86°F). Below that, a wetsuit or rash guard makes a big difference. Here's a simple temperature guide plus what to wear.
Water temperature makes or breaks a snorkel. You lose body heat roughly 25 times faster in water than in air, so a sea that feels "fine" for a quick dip can get cold surprisingly quickly when you're floating still and looking down. Here's a simple guide to what's comfortable, and what to wear.
A simple temperature guide
- 28–30°C (82–86°F) — bath-warm tropical water; swimwear only, snorkel as long as you like.
- 25–28°C (77–82°F) — ideal for most people in swimwear.
- 22–25°C (72–77°F) — comfortable for most; a rash guard adds a little warmth and sun protection.
- 18–22°C (64–72°F) — cool; a shorty or 3mm wetsuit keeps you in longer.
- Below 18°C (64°F) — cold; wear a 3mm+ wetsuit and keep sessions short.
What to wear
A rash guard blocks sun and takes the edge off cool water. A shorty wetsuit (short arms and legs) suits 20–24°C. A full 3mm wetsuit is the go-to below about 20°C, and warmer still with a 5mm in cooler seas. Even in warm water, a thin top helps prevent sunburn on your back — the part of you that's exposed the whole time.
Why the forecast matters
Sea temperature varies a lot by location and season, and changes through the year. Rather than rely on averages, check the current and recent sea temperature for your specific spot before you go. Browse a destination below to see its live water temperature alongside wave, wind and tide conditions.
Frequently asked questions
What water temperature is comfortable for snorkeling?
Most snorkelers are comfortable between 20 and 30°C (68 to 86°F). Around 25–28°C is ideal for swimwear alone. From 18 to 22°C a rash guard or shorty wetsuit helps, and below about 18°C you'll want a 3mm or thicker wetsuit to stay warm.
Is 20°C water too cold to snorkel?
20°C (68°F) is on the cool side but fine for a shorter snorkel, especially with a rash guard or shorty wetsuit. You lose heat far faster in water than in air, so if you start shivering, get out and warm up.
How can I check the water temperature before I go?
Use a sea-surface-temperature forecast for your exact spot. SnorkelForecast shows the current and recent average sea temperature for each location, along with wave, wind and tide conditions.