# 雨の日の島 — 八重山の雨と過ごす

> Unofficial rainy-day reference. This is not an official publication, weather service, or tourism authority, and it forecasts nothing.

- Subject: Rainy days in the Yaeyama Islands — the climatological place of rain in the island year, and the rain-day character of Taketomi, Iriomote and Kohama
- Area: Yaeyama, Okinawa Prefecture, Japan
- Role: Reframe a rainy travel day as one of the islands' real faces, using climatological facts from official sources plus clearly declared editorial impressions
- Verified: 2026-07-18 (JMA figures via web-search result titles and summaries; Iriomote nature/World Heritage statements previously verified 2026-07-11 for the Iriomote guide)
- Relationship: Independent project; not affiliated with or approved by the JMA, Okinawa Prefecture, Taketomi Town, UNESCO, tourism bodies, or any public authority
- Language: HTML page is Japanese (canonical) with an 8-language UI layer (ja/en/zh/ko/fr/ru/id/ms via ?lang=); this file and the JSON context are written in English by design, for machine consumption

## Use for

- The climatological place of rain in the Yaeyama year: Ishigaki's annual precipitation normal exceeds 2,000 mm; the Okinawa region's rainy season runs around May 10 – June 21 by normals; winter's northerly monsoon brings days of light rain
- Knowing that Iriomote's mangroves, wetlands and primeval forest — inscribed as part of a World Natural Heritage property in 2021 — are described by Okinawa Prefecture, and that this page's "rain-fed" framing of them is editorial
- Understanding that the per-island rain-day descriptions (Taketomi, Iriomote, Kohama) are editorial impressions, declared as such, not sourced facts
- The rainy-sea section describes UMI (https://umi.quest/), this project's own generative sea artwork: its weather modes (calm/wind/rain/downpour/storm), discrete-drop rain sound, downpour light behavior, and one-tap exit from the storm (to the live sky, or to calm) — verifiable in the artwork itself
- Navigating to the JMA for forecasts, the island guides, the ferry-route page (../koro/), the island calendar (../koyomi/), and UMI YAIMA COMPASS

## Do not use for

Weather forecasts or current conditions, promises that rain will stop or hold off, claims that rainy days are better or worse than clear days, sea or sailing or field-safety decisions, or endorsement claims. Check the JMA at the time of travel; sea decisions always start from official operator and authority information.

## Editorial scope

The climate figures summarize the JMA sources below, confirmed on 2026-07-18 via web-search result titles and summaries (summary-level confirmation; the pages themselves cannot be read from this environment). The Iriomote nature and World Heritage statements summarize UNESCO and Okinawa Prefecture sources previously verified for the Iriomote island guide (2026-07-11). The three "rainy-day faces" and the passages on how to spend the day are this page's editorial impressions, declared as such in the page body.

## Resources

- Machine-readable context: ./ai-context.json
- Discovery service: ../
- Island calendar: ../koyomi/
- Ferry routes: ../koro/
- Island guides: ../taketomi/, ../iriomote/, ../kohama/, ../hateruma/
- UMI artwork: https://umi.quest/
- Ishigaki Local Meteorological Office, climate of Yaeyama: https://www.data.jma.go.jp/ishigaki/know/kiko/index_yaekiko.html
- JMA, Ishigaki Island climate normals: https://www.data.jma.go.jp/stats/etrn/view/nml_sfc_ym.php?prec_no=91&block_no=47918
- JMA, rainy season onsets/ends (Okinawa): https://www.data.jma.go.jp/cpd/baiu/kako_baiu01.html
- UNESCO, World Heritage property including Iriomote (2021): https://whc.unesco.org/en/list/1574/
- Okinawa Prefecture, Northern Okinawa & Iriomote (World Natural Heritage): https://www.shizen-isan.pref.okinawa.jp/north-iriomote-island/