greystash (of mac-classic.com fame) just built and released a new weather application for Mac OS built in Real-Basic. It allows the user to get weather data for any specified place on earth through the Open-Meteo API. It doesn't support Umlauts (ä,ö,ü) as of now, so a place like "Gävle" needs to be specified as "Gavle" - other than that, it seems to run pretty stable on Mac OS 7 and up, including Mac OS 9.

It also offers a 7-day-forecast function for its registered users. Check it out if you're having a Mac OS 9 install with an online connection.

Get it here: Download