Marine Weather Forecast
for Any Coast
SeaLegs AI combines NOAA zone forecasts, NDBC buoy observations, and 12+ high-resolution ocean models into one clear marine forecast — live winds, waves, swell period, tides, SST, and currents. Built for boaters, anglers, and offshore captains who want a straight answer before they leave the dock.
Download SeaLegs AI Offshore Fishing ReportsWhy a marine forecast is its own thing
Land forecasts mislead you on the water. Wind over open water is 20–30% higher. Wave and tide data simply aren't in a land forecast. A proper marine forecast answers different questions.
Wind & Gusts
Surface wind speed and direction from NOAA GFS, HRRR, and ECMWF — with live gusts from NDBC buoys. Knots, not MPH.
Waves, Swell & Period
Combined sea height, wind-wave height, swell height, and period — the number that decides whether a 4-foot sea feels smooth or brutal.
Tides & Currents
NOAA CO-OPS tide predictions plus ocean current speed and direction — so you know when the ebb will meet the wind and turn your ride.
NOAA Warnings
Active small craft advisories, gale warnings, storm warnings, thunderstorm watches — pulled directly from the National Weather Service zone feed.
Why SeaLegs AI, not just NOAA
NOAA is the authoritative baseline. SeaLegs AI does the work every serious boater does by hand and wishes they didn't have to.
Multi-model comparison
When GFS says 15 knots and ECMWF says 25 knots, that disagreement is the signal. SeaLegs AI surfaces the spread between 12+ models so you know when the forecast is high-confidence and when it isn't.
Your trip, not a zone
A NOAA zone forecast covers 20–40 nautical miles. Your trip covers 8. SeaLegs AI gives you wind and waves for the exact points you're going, not an averaged zone.
AI Go / Caution / Avoid
SeaLegs AI synthesizes wind, waves, period, current, and model agreement into a single recommendation for your exact trip — with the reasoning visible, so you can agree or override.
Understand the forecast before you read it
Three explainers written by and for people who actually go out on the water.
Marine Forecasts Explained
What a marine forecast is, what's in it, where NOAA gets the data, and how to read one without a meteorology degree.
Wave Height vs. Period
Why a 3-foot sea at 5 seconds is rougher than a 5-foot swell at 12 seconds — and how to tell the difference at a glance.
Sea Surface Temperature Explained
What SST is, why fish hold on temperature breaks, and how to read an SST map for your next offshore run.
Frequently Asked Questions
What is a marine weather forecast?
A marine weather forecast is a weather prediction written specifically for people on the water, including wind speed and direction at the sea surface, wave and swell height, swell period, tides, visibility, and hazardous-weather warnings. Most U.S. marine forecasts come from the NOAA National Weather Service. See our full explainer →
Is the SeaLegs AI marine forecast free?
Yes. The core marine forecast on sealegs.ai and in the SeaLegs AI app is free. DeepCast offshore fishing reports are a separate paid offering ($9.99 per report or $99.99 for 10) for anglers who want tactical, AI-synthesized guidance on top of the free forecast.
Where does the forecast data come from?
SeaLegs AI combines NOAA National Weather Service zone forecasts, NDBC buoy observations, and 12+ global and regional weather models (GFS, ECMWF, NAM, HRRR, WaveWatch III, and others). The AI layer on top identifies model agreement and disagreement to give you a confidence-weighted forecast.
How is this different from NOAA's free forecast?
NOAA is the authoritative source; SeaLegs AI doesn't replace it. What SeaLegs AI adds: multi-model comparison (so you know when models disagree), AI Go/Caution/Avoid decision support for your specific trip, visualizations for wind, waves, SST, and currents, and regional detail that NOAA's zone forecasts don't capture.
Does the forecast cover offshore waters?
Yes. SeaLegs AI covers coastal, nearshore, and offshore U.S. waters, plus major recreational coastlines globally. DeepCast — our offshore fishing reports feature — adds high-resolution ocean data (SST, chlorophyll, eddies, currents) for anglers targeting canyons, rips, and offshore structure.
Get the Marine Forecast That Actually Helps You Decide
SeaLegs AI is free on iOS and Android. Download once, forecast anywhere. DeepCast offshore fishing reports available as paid add-ons for serious anglers.
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