The BeachWeather app for iPhone and iPad has air and water temperatures, UV forecasts, wind speed and direction and tide tables.
Surfline for iPhone and Androids gives you a glimpse of the waves long before you see the coastline, surf cameras plus surf forecasts and reports with wave height, wind speed and direction, weather, sunrise and sunset times.
And to keep you and your family safe in the sun, there's the Coppertone My UVA alert app. from the makers of the popular sunscreen. The app gives you the UV index at your current location, lets you save multiple sun care profiles for family members, and lets you set a timer and alarm for when it's time to reapply.
The sun timer app for android performs a similar service, allowing you to enter skin tone, your sunscreen's SPF, and the sun's conditions to know when you'll go from golden glow to danger zone.
This is a CNN report.