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Weather Warnings for Naoshima
The Japan Meteorological Agency's own warnings and advisories for Naoshima — heavy rain, wind, high waves and thunderstorms — with the wind at Miyanoura and the channels that decide whether the boats sail.
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From Town Tools. For the current version, visit https://www.towntools.org/naoshima-kagawa-prefecture-jp/weather-warnings
The Japan Meteorological Agency's warnings and advisories for Naoshima itself — heavy rain, flooding, high wind, high waves, thunderstorms and the rest — plus the wind at Miyanoura.
Kagawa Prefecture is covered by the Takamatsu Local Meteorological Office, and Naoshima is reported as its own area (直島町) rather than lumped in with Takamatsu City. What you see here is what that office has issued, in the office's own terms.
No weather warnings for Naoshima right now.
The Japan Meteorological Agency has no warnings or advisories in force for Naoshima, as of Sat 8 August at 10:49.
The wind at Miyanoura Port
A moderate breeze (about 27 km/h, gusts to 44), out of the east.
Strongest gusts forecast over the next 24 hours: about 44 km/h. Wind words follow the Beaufort scale. This is a weather model’s forecast for the hour, not a measurement — exposed ground above town will see more.
Where to check next
This page carries the JMA's hazard warnings. Whether a particular boat sails is the operator's decision, not the JMA's, and the town office is the channel for evacuation notices and shelter openings — so in weather bad enough to matter, all three are worth a look.
Shikoku Kisen — operating statusWhether today's boats are running, from the company that runs them. A warning here does not automatically cancel a crossing, and a crossing can be cancelled with no warning in force.
Naoshima Town Office (直島町役場)Evacuation advisories, shelter openings and school closures come from the town, not from this page. Tel 087-892-2222.
Naoshima Fureai Clinic — out-of-hours careTel 087-892-2266. Worth knowing before a storm: when the boats stop, the clinic is the island's only medical care until they start again.
Get an email when a warning is issued
Official warnings, forwarded the moment the national service issues one for the area — headline and all, in its own words. Nothing in between. No account, one-click unsubscribe.
Worth knowing
A warning is about the weather, not about the ferry
These are the Meteorological Agency's hazard warnings for the island. Shikoku Kisen decides separately whether each crossing sails, and it publishes its own cancellation notices — which is what the "Are the Ferries Running?" page on this site reads. The two do not always move together: fog closes crossings with no warning in force at all, and an advisory can be running while every boat sails to time.
The Inland Sea is sheltered — the risk here is being on the wrong side
Naoshima sits inside the Seto Inland Sea, so it does not get the open-ocean storm surge that exposed Pacific coasts do. What a typhoon does here is stop the boats. With no bridge, that is the whole of it: a suspended crossing means a missed hospital appointment in Tamano, a high-school student who cannot get to Takamatsu, and a supply run that does not happen. The warnings worth acting on early are wind (暴風) and high waves (波浪).
When the warnings come
Typhoon season runs roughly July to October, with August and September the busiest. The June rainy season brings the heavy-rain (大雨) and flood (洪水) warnings instead. Winter brings strong north-westerlies that can close a crossing on a clear day.
What the words mean
The JMA issues three levels. 注意報 (advisory) means conditions could cause damage. 警報 (warning) means serious damage is possible. 特別警報 (emergency warning) is reserved for the scale of event seen once in decades — if one is issued, act on the town's instructions immediately and do not wait for anything on this page.
Warning data: Japan Meteorological Agency, from the official open distribution at jma.go.jp (Public Data License v1.0, compatible with CC BY 4.0); shown as JMA issues them, processed into English using JMA’s own multilingual dictionary. This page reads the warnings JMA has posted for Naoshima. Wind forecast: Open-Meteo (CC BY 4.0). This page is not an alert service — sign up to the official channels above.