Why sailors need chart-based forecasts
Sailing decisions revolve around timing. You need to know when the wind fills in, when it clocks around, when a front passes, and how long the window stays open before the next system arrives. Traditional weather apps reduce all of this to a single wind speed number and a rain icon. That is not enough information to plan a passage, schedule a race start, or decide whether to leave the harbor.
Weathercaster shows the forecast as a continuous timeline, with precipitation, cloud cover, temperature, and lightning risk together and wind speed and direction in a dedicated chart. A rain icon on both Friday and Saturday could hide a storm that passes overnight; the charts show when the rain ends, whether the wind shifts afterward, and when a safer sailing window may open. This format was inspired by weather charts used on wind farms, where timing matters.
Features that matter on the water
Wind chart with speed and direction
Enable Weathercaster's dedicated wind chart to compare sustained wind with gust speed. Direction vectors show shifts through the day. You can see a sea breeze build, spot changes around a front, and identify calmer periods for motoring or anchoring.
Offshore map pin placement
Coastal forecasts may not describe conditions 10 or 20 miles offshore. With Weathercaster Pro, you can drag the map pin to a point on the water. Place pins at waypoints along your route, at an anchorage, or in the middle of a passage to request an Apple Weather forecast for that location.
Hurricane and tropical storm tracking
During hurricane season, Weathercaster Pro provides shortcuts to track active storms alongside your regular forecast locations. Whether you are monitoring a developing system from the dock or making passage decisions in tropical waters, you can see storm data in the same chart-based format as your regular forecasts. This puts storm timing in context with your local conditions.
Model-run overlays for forecast context
Weathercaster Pro can overlay multiple forecast runs on the same chart. When successive runs remain similar, the forecast has been relatively stable; when they diverge, the outlook is changing. This provides useful context for multi-day planning, but agreement between runs does not guarantee accuracy.
CSV export for voyage planning
Weathercaster Pro lets you export forecast data as CSV files. Use this to build passage plans in a spreadsheet, log expected conditions for a delivery, or share forecast data with crew before departure. The export includes all the data visible on the chart: temperature, wind speed and direction, precipitation, and cloud cover, hour by hour.
Weather windows at a glance
The landscape 10-day view is where passage planning happens. Turn your iPhone sideways and you can see the full extended forecast on one screen. Fronts appear as precipitation bands with wind shifts; high-pressure windows show as clear stretches of yellow cloud cover and steady wind. You can spot the best departure window, estimate arrival conditions, and identify when the next system arrives.
Free vs. Pro for sailors
Free Weathercaster gives you two locations with the full chart experience. This works for day sailors who primarily sail from one harbor. Pro unlocks unlimited locations for multiple waypoints along a route, offshore map pin placement, hurricane tracking, model-run overlays, and CSV export. If you do coastal cruising, racing, or passages, Pro is where the sailing-specific tools live.
How to use Weathercaster for sailing
- Set up your locations. Add your home harbor, then use map pin adjustment to place pins at key waypoints along your regular routes or at offshore racing areas.
- Read the wind chart. Look at the wind speed line and directional arrows together. Identify when breeze fills in, when shifts happen, and when conditions exceed your comfort level.
- Find weather windows in landscape mode. Turn your phone sideways to see the full 10-day chart. Look for stretches between fronts with manageable wind and minimal precipitation.
- Check model-run overlays. Compare recent runs to see whether the expected timing and conditions have remained stable or shifted.
- Export and share. Pull CSV data for your passage plan or share it with crew so everyone is looking at the same forecast.
- Download before departure. Save forecasts for offline use in case you lose cell coverage offshore.
Data source and privacy
Weathercaster gets its forecast data from Apple Weather through WeatherKit, which uses multiple weather models and providers. Weathercaster's charts make the timing of rain, clouds, and wind shifts easier to compare. Learn more about the forecast source. The app does not require an account or use third-party analytics and trackers; it checks your current location only when you ask it to.
