Sea Temperature: Water Temp
Beach, swim, surf, dive
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Sea temperature at beaches near you, measured by NOAA and NASA satellites — and we tell you exactly where the number came from.
How warm is the sea today? Sea Temperature shows the water temperature at beaches near you, and at any beach in the world you can name.
MEASURED, NOT GUESSED
Temperatures come from NOAA CoastWatch and NASA JPL satellite analysis — the same public data used in oceanographic research, updated every day.
WHAT YOU GET
• Sea temperature at the beaches closest to you
• Search thousands of beaches worldwide — works with no signal
• What the temperature actually means for swimming
• Wetsuit guidance for surfing and diving
• Save the beaches you swim at
HONEST ABOUT WHAT IT IS
Most apps in this category show you a number and leave it there. This one tells you where the number came from and how far offshore it was measured, because that matters: a satellite reports one value for a patch of sea a few kilometres across, and the shallow water you actually stand in can be two or three degrees warmer on a hot, still afternoon.
WHAT IT CANNOT DO
It cannot tell you whether the water is clean, whether there are jellyfish or currents, or whether it is safe to swim today. It does not forecast — every number is a measurement already taken, not a prediction. Always follow the flags and the lifeguards. Oceans and seas only; inland lakes are not covered.
PREMIUM
An optional subscription adds unlimited saved beaches, the last 7 days at every beach, and comparison with the same week last year. You can also unlock one beach's history by watching a short ad instead.
Terms of Use: https://mrtctns.github.io/terms/
Privacy Policy: https://mrtctns.github.io/privacy/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Mert Cetin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Mert Cetin
- Size
- 14.5 MB
- Category
- Weather
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 13 more
- English, Arabic, Bulgarian, Dutch, French, German, Greek, Italian, Polish, Portuguese, Russian, Spanish, Turkish, Ukrainian
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Sea Temp Premium $19.99
- Sea Temp Premium $6.99
- Sea Temp Premium $3.99
- Copyright
- © 2026 Mert Cetin