San Juan International Billfish TournamentMarine Weather — San Juan, Puerto Rico

About the San Juan International Billfish Tournament

• DatesNov 17–22, 2026
• Host portSan Juan, Puerto Rico — Club Náutico de San Juan, Miramar (registration, weigh-ins and awards)
• The runOut of San Juan Bay past El Morro into Blue Marlin Alley — blue water within a few miles of the harbour mouth
• Target speciesblue marlin, fished IGFA tag-and-release

The San Juan International Billfish Tournament is run by the Club Náutico de San Juan, which bills it as the longest consecutively held big-game fishing tournament in the world; the 73rd edition is fished in November 2026. Boats leave San Juan Bay, clear the harbour mouth under El Morro, and are in blue water almost immediately — the strip of deep water off this coast has its own name, Blue Marlin Alley.

The format is IGFA tag-and-release for blue marlin, with sonar and non-sonar divisions, fished over three days. What makes the weather call here different from a canyon tournament is the geography: there is no long run and no shelf to cross, so the question is never whether you can reach the grounds. It is whether the harbour entrance is workable — and that is the single reading this page is built around. The card below gives each day a plain GO, CAUTION, or NO-GO call, updated every morning from the latest marine model data, the same AI rating used in the SeaLegs AI app.

Official tournament site & registration →

Reading conditions for the San Juan IBT

Read the swell before the wind. Puerto Rico's north coast faces the open Atlantic with almost no continental shelf in front of it, so a long-period north or northeast groundswell — generated by a system thousands of miles away, often under a clear local sky and a light breeze — lands on this coast at close to full strength. Height alone will not tell you how the morning will go; the period is what says how the entrance channel will behave. This is a winter-weighted pattern that builds from November through March, and the tournament sits right at the front edge of that window.

Then read the trades. The prevailing easterly to northeasterly trade winds are the everyday driver, generally freshest through the middle of the day and lightest around dawn — which is why boats leave early. Trade-driven chop riding on top of a groundswell already running is a very different sea from either one alone, and the two stack in the entrance. Note also that the Atlantic hurricane season runs through November 30, so a distant tropical system is still a live consideration during tournament week.

The bay itself is the shelter. Bahía de San Juan is a genuine deep-water harbour behind a narrow entrance, so inside stays workable in conditions that shut the outside down. Crossing that entrance is the decision point, not the distance offshore — and once you are past it there is no shallow water to duck into. This page is a planning aid, not a substitute for the official NWS coastal waters forecast and marine warnings, which for this stretch is zone AMZ712 out to 10 nautical miles.

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