The short versionCheck wind and sea state, tide timing and currents, water temperature, available water-quality information, daylight, entry and exit points, and official warnings. No single green signal makes a swim safe.
What Seyva checks for swimming
The public outlook compares predicted high-tide windows with hourly wind and weather. Its starter swimming setting uses an 11 mph maximum sustained wind and avoids available pollution warnings. That threshold is a product default, not a universal safety limit.
Conditions that can change the decision
- Wind and sea state: wind can build chop, move you away from an exit point and make the return harder.
- Tide and current: tide height changes access while moving water can create strong local currents.
- Cold: colder water and air can reduce the time you can comfortably and safely remain in the water.
- Water quality: check official bathing-water information and live overflow reports where available.
- Local hazards: rocks, groynes, piers, boats, surf and rip currents are not captured by a town-level forecast.
Before entering
Choose a lifeguarded beach where possible, swim with someone, identify entry and exit points, wear visible equipment appropriate for the conditions, and carry a means of calling for help. If the conditions do not look or feel right, change the plan.