MyObservatory is a popular weather app developed by the Hong Kong Observatory, available for iPhone users. This app offers personalized weather services, delivering current weather details such as temperature, humidity, rainfall, wind direction, and speed. Users can view weather photographs captured by nearby weather stations at their location, specified locations, or selected weather stations. Updates for weather photos and rainfall data occur at 5-minute and 15-minute intervals respectively, while other data is refreshed every 10 minutes, with update times displayed on the front page.

The app also provides notification services for weather warnings, Special Weather Tips, and Location-based Rain Forecast through Apple Push Notification service (APNs). Users are advised not to solely rely on the app for crucial weather information due to potential delays in receiving notifications. Additionally, enabling Location-based Rain Forecast notifications may slightly increase battery usage and data consumption, prompting users to adjust settings for optimal use.