제주도 날씨 is an Android app that provides users with the current weather and a 3-day weather forecast for Jeju Island. Developed by Happy2U, this app is designed to be useful for both tourists and locals, as Jeju Island often experiences different weather conditions in its northern, southern, eastern, and western parts.

The weather data provided in 제주도 날씨 is sourced from the Korea Meteorological Administration. The current weather is updated every hour on the hour, directly from the meteorological administration. In case there are any issues with the meteorological administration's server and the current weather data is not available, the app retrieves the current weather information from the meteorological administration's website instead.

Please note that the current weather information on the meteorological administration's website is only available for four specific locations on Jeju Island, representing the north, south, east, and west regions.