1. Choose a location
Search for a UK town, city or beach. Local weather pages show the forecast for the selected place, including inland cities such as London and Bristol. Coastal outlooks also use a nearby tide reference for planning time on the water.
2. Combine the live data
Every location has local temperature, rain and wind forecasts. Coastal pages also bring together tide events, available sea-temperature information and water-quality checks where the sources cover that location. Missing water-quality information is shown as “Not available”. The forecast update time is shown with the weather.
3. Match an activity window
For coastal public pages, paddleboarding uses an 8 mph maximum wind and 12°C minimum air temperature. Swimming uses an 11 mph maximum wind. Kayaking accepts any tide, caps wind at 12 mph, avoids location-based offshore directions, requires at least 8°C air temperature and keeps the full session between sunrise and sunset. Available pollution checks are included. These website defaults differ from the personal preferences you can set in the app, and are planning settings rather than safety limits.
4. Show the clearest result
Excellent means a window matches the selected settings without identified warnings in the available data. Good indicates a match with a caution to read. No match means the returned windows did not meet the starter settings. None of these labels confirms that entering the water is safe. Local weather pages link to coastal destinations when you want an activity check.
Forecasts and feeds can be delayed, incomplete or wrong. Always recheck official and local information before entering the water.
Website, Free app and Seyva Plus
The Android app is in testing. See the Seyva app page for the current public testing link status and app previews.
Use Weather to check weather and sea conditions, Planner to find sessions that fit your preferences, and My sessions to see the sessions you follow.
Website: a quick public check
Check up to five available forecast days of weather and tides, plus today’s activity windows using public starter settings. No account needed. Plan personalised activities for other days in the app.
Free app: your next two sessions
Choose up to two activities and set your preferences. Check weather and sea conditions for today and tomorrow. Full details are included for your next two available sessions, in time order across your activities, including sessions on later days. This means two activity sessions, not two calendar days.
Optional ads: unlock more details
Where offered, watch an ad to unlock forecast or session details. A forecast reward opens up to five forecast dates, including today, until midnight UK time. A session reward opens that session’s details until it finishes. The unlock screen explains the scope and expiry before you choose. Ad availability varies, and ad unlocks do not include following or session alerts.
Seyva Plus: plan further and follow sessions
Choose swimming, paddleboarding, kayaking and windsurfing, open every session’s details, and plan across up to 14 available forecast days. Follow sessions for forecast-change alerts and reminders. No ads.
£2.99/month after a 14-day free trial for eligible subscribers. A trial or subscription starts only when you confirm it in the app store. Unless cancelled, an eligible trial becomes a paid subscription and subscriptions renew automatically. Check the store’s price, eligibility and renewal terms before subscribing.
Following sessions requires Seyva Plus. Essential warnings and available water-quality information remain accessible. Forecast coverage depends on the data returned; missing marine values are shown as a dash, and a session may remain Potential until the required forecast is available.