Slackwater: Tides & Weather
3,600+ NOAA tide stations
About
Get real-time tide and weather information for over 3,600 NOAA stations. Plan your water activities with detailed forecasts, wind data, and fishing times. Save favorite spots for quick checks and utilize home-screen widgets for instant updates.
What's New in Slackwater
1.4
July 31, 2026
Sea state is here. Know how the conditions before you go: • New sea-state layer on the map, wave height as a clean, water-only color field • Tap any station for the full read: wave height, swell, and wind-wave, with direction and period • Faster, smoother weather layers • Tide status now tells you exactly when the tide turns, "Low in 1h 12m" • Station-card polish throughout
MoreSubscription plans
Slackwater Pro
Unlocks all Slackwater features for one year.
Developer apps
FAQ
What is Slackwater?
Slackwater is a weather app that provides real-time tide information, wind and precipitation forecasts, and fishing times for over 3,600 NOAA tide stations. It is designed for planning recreational water activities.
Does Slackwater have ads?
No, Slackwater is ad-free. The app is designed with privacy in mind and does not include advertisements or tracking.
How much does Slackwater Pro cost?
Slackwater Pro is available for $4.99 per year and includes a 7-day free trial. This subscription removes ads and supports the app's services.
Can I cancel my Slackwater Pro subscription?
Yes, you can manage or cancel your Slackwater Pro subscription at any time through your Apple ID settings. Auto-renewal can be turned off at least 24 hours before the current period ends.
What devices support Slackwater?
Slackwater is supported on iPhone and iPad devices. It is available for download on the App Store.
How often is Slackwater updated?
Slackwater was last updated on July 16, 2026, with version 1.2. The app receives regular updates to improve functionality and data accuracy.
What data sources does Slackwater use?
Slackwater uses data from NOAA, the National Weather Service, and the U.S. Naval Observatory. Radar data is provided by RainViewer, and forecast grids are from Open-Meteo.
Is Slackwater suitable for navigation?
No, Slackwater is intended for planning and recreation only. Tides and weather information provided are not for navigation or safety-of-life decisions. Always check official sources before heading out.