You can unlock professional Foreca, Open-Meteo, and Dark Sky forecast sources, weather alerts, nowcast, and all styles and options via a reasonably priced subscription, which covers the cost of data and allows me to further improve Weathergraph.
Weathergraph is a beautiful visual hourly weather widget and forecast for Watch, iPhone, iPad, and Mac, with the Apple Watch app and complications.
Hourly forecast is updated every hour and cached offline — the chart always shows the current temperature according to the last obtained forecast, even when you go off for a long trek without a data connection.
If rain or snow is expected during the next 3 hours, you will get a notice on a widget (iPhone, iPad & Mac), a large complication (Watch), and a detailed 3-hour precipitation chart in the app.
Nowcast and alerts are powered by Foreca and depend on the precision of rain radars in your area.
Subscriptions made on Apple devices will be charged to your credit card through your iTunes account.
If you liked Weather Line, Weathertron, or Weather Strip, you might like Weathergraph too :).
Nowcast and rain alerts update every 15 minutes.
Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period.
Manage or turn off your subscriptions in App Store app > Account > Subscriptions.
You will not be able to cancel once activated.