Build marine weather forecasts into your app with our REST API. No charts to interpret, no data to analyze—just clear, human-readable conditions and recommendations for any marine location on Earth.
curl -X POST https://api.sealegs.ai/v3/spotcast \
-H "X-API-Key: your_api_key" \
-d '{
"latitude": 25.954,
"longitude": -79.743,
"start_date": "2025-12-03",
"num_days": 3
}'{
"summary": "The three-day period shows progressively
favorable conditions for recreational boating.
Wednesday starts rough but improves significantly
by evening. Thursday and Friday offer excellent
all-day conditions with light winds (7-12kt) and
manageable seas (1.8-2.8ft). High forecast
confidence (95%) for Thursday and Friday ensures
reliable planning. Wave periods remain short at
4 seconds throughout, creating slightly choppy
conditions, but wave heights stay comfortable
for typical recreational vessels."
}Everything you need to build marine weather applications
Weather forecasts for any marine location worldwide, including coastal waters and open ocean.
Wind speed, gusts, wave height, swell, precipitation, visibility, and more for marine conditions.
Access data from GFS, NAM, HRRR, and other leading weather models for comprehensive analysis.
We analyze data from multiple weather models and look at trends with a proprietary algorithm to create trusted, accurate forecasts.
AI-powered daily classifications and natural language summaries to help you understand the conditions at a glance.
AI-powered marine forecasts for any location on Earth. Explore our regional guides.
Start free with 10 forecast-day credits. Pay only for what you use after that.
Integrate the marine weather API with the approach that works best for you
Embed a live marine forecast on your website with just a few lines of HTML. No API calls needed—we handle everything.
Full programmatic access to marine forecasts. Build custom integrations, mobile apps, or backend services.
curl -X POST .../v3/spotcast \
-d '{"latitude": 25.954,
"longitude": -79.743}'{"summary": "Excellent
conditions with light
winds (7-12kt)..."}Go to your dashboard and create a new SpotCast Widget. Set your location, customize the style, and we'll give you an embed code.
Copy the embed code and paste it into your HTML. That's it—your live marine forecast is ready!
<!-- Add this where you want the widget -->
<div id="sealegs-widget-wgt_abc123"></div>
<script src="https://cdn.sealegs.ai/spotcast_widget.js"
data-widget-id="wgt_abc123"
data-type="mini"
async></script>Generate an API key from your dashboard. Keep it secure!
X-API-Key: slk_live_abc123...Fetch a marine weather forecast for any location.
curl -X POST https://api.sealegs.ai/v3/spotcast \
-H "X-API-Key: your_api_key" \
-d '{
"latitude": 25.954,
"longitude": -79.743,
"start_date": "2025-12-03",
"num_days": 3
}'Use the AI-powered forecast to power your marine application!
{
"summary": "The three-day period shows progressively
favorable conditions for recreational boating.
Wednesday starts rough but improves significantly
by evening. Thursday and Friday offer excellent
all-day conditions with light winds (7-12kt) and
manageable seas (1.8-2.8ft). High forecast
confidence (95%) for Thursday and Friday ensures
reliable planning. Wave periods remain short at
4 seconds throughout, creating slightly choppy
conditions, but wave heights stay comfortable
for typical recreational vessels."
}Technical articles about marine weather APIs, integration guides, and engineering insights.
Automate go/no-go decisions, proactive rescheduling, and customer weather communication.
Read more →Add a live marine weather forecast to your website in under 5 minutes with the SpotCast widget.
Read more →Build a webhook receiver, verify signatures, handle retries, and create an automated daily alert system.
Read more →Create your free developer account and start building with our marine weather API today.
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