Sea & Water Temperature

Before you get in, know how cold it really is. Sea & Water Temperature shows the current water temperature at your coast, tells you what wetsuit (if any) you'll want, and rates how comfortable — and how safe — the water is for swimming, surfing and diving.

A bold thermometer-and-wave display gives you the sea temp now in °C or °F, with an honest comfort read from "warm, bathwater-like" down to "dangerously cold."

WHAT YOU GET

• Sea temperature now — the current water temperature with a swim-comfort rating you can trust at a glance.
• Wetsuit guide — the recommended wetsuit thickness for the temperature, from boardshorts to a 6/5 mm full suit with boots, hood and gloves.
• Air vs water — see how the air temperature compares to the water and why the sea might feel warmer or colder than it looks.
• Activity suitability — quick Great / OK / Tough / Unsafe ratings for swimming, surfing and diving, plus cold-water immersion guidance so you understand the risk.
• 7-day temperature trend — daily sea-surface temperature with the air temperature overlaid for the week ahead.
• Saved spots — add your favourite beaches and lakes and compare their water temperatures side by side.

WHO IT'S FOR

Open-water and cold-water swimmers, surfers and bodyboarders, divers and snorkelers, paddleboarders and kayakers, triathletes, wild swimmers and anyone planning a dip at the beach or lake.

HOW IT WORKS

Water temperatures come from the Open-Meteo marine model for your location. Enable location for your coast, or browse sample data offline. Save spots to compare them anytime.

A NOTE ON ACCURACY & SAFETY

Sea-surface temperatures are model estimates and can differ from the real water at your exact beach, in sheltered coves, or at depth. Wetsuit, comfort and safety guidance is general advice, not medical advice. Cold water is dangerous — always check conditions and never swim alone before a cold-water swim or dive.

No account and no sign-up — just open the app and go.

Recent changes:
A saved spot no longer shows a placeholder temperature when there is no marine data for it — it now says so plainly instead of displaying a number that was never measured.