Provides detailed marine weather forecasts for various water sports and leisure activities. Offers real-time wind predictions, wave data, and tide information for over 18,000 coastal locations. Includes a free trial for premium features.
1.2.57
November 11, 2026
一部風速バーの表示がされない不具合を修正しました。 本バージョンより動作環境を iOS 15.0 以降 に変更いたしました。
海快晴１ヶ月自動更新
海快晴 is a specialized marine weather information service offering detailed forecasts for water sports and leisure activities. It provides real-time wind predictions, wave data, and tide information for over 18,000 coastal locations across Japan.
Yes, 海快晴 offers a one-month free trial for its Basic Course to first-time subscribers. This trial period allows users to explore premium features before committing to a paid subscription.
Paid features include hourly updated real-time wind forecasts up to 10 hours ahead, pinpoint forecasts for wind, wave height, and tide for over 18,000 coastal locations up to 72 hours ahead, and offshore weekly forecasts. It also offers dual forecast data from proprietary models and the Japan Meteorological Agency (JMA).
The paid subscription for 海快晴 costs 480 yen (tax included) per month. This subscription provides access to advanced marine weather forecasting features.
To cancel your subscription, go to your iPhone/iPad's 'Settings', tap your user name, select 'Subscriptions', and then choose '海快晴' to cancel the automatic renewal. Cancellations must be done through the App Store or iTunes.
The app requires an internet connection to access real-time weather data and forecasts. While some cached information might be available, full functionality, especially for updated forecasts, relies on an active internet connection.
海快晴 is available for iPhone and iPod. The app is designed for iOS devices.
The app itself is regularly updated with new features and improvements, with the latest version being 1.2.57 as of November 11, 2026. The weather data within the app, such as the real-time wind forecast, is updated hourly or every 30 minutes depending on the feature.
