Meteo Switzerland

Meteo Switzerland is the official weather service of Switzerland with very accurate detailed forecasts, including the much-used rain radar with surprising accuracy. The written weather report is particularly informative and much more relevant than the usual weather icons.
meteoschweiz.admin.ch/#tab=forecast-map

German Weather Service

The German Weather Service is the equivalent of Meteo Schweiz in Germany. It is important to limit it to one federal state, otherwise the data for the whole country is too variable. The presentation of the forecasts is not very user-friendly, but provides reliable data with a little clicking.
dwd.de

Zentralanstalt für Meteorologie, Österreich

The website of the public weather service of Austria is a horror, but the data is informative. The breakdown by federal state is also necessary here. Here too, the forecast text provides the more interesting basics than the abstract symbols. The precipitation radar is practically useless due to its inaccuracy.
zamg.ac.at/cms/en/weather/weather-oesterreich

Weather services Italy

In Italy, the weather forecasts of the individual provinces are a good basis. These are structured differently, but all provide more reliable data than the large weather platforms.
Piedmont: regione.piemonte.it/web/meteo
Aosta: cf.regione.vda.it/it/
South Tyrol: weather.province.bz.it

Extra tip: YR

The Norwegian weather service YR has become one of the hottest tips within the weather apps. They are considered to be among the most accurate of the global meteorological services. YR has a high-quality mobile app.
yr.no

The classic: Meteoblue

There are now countless providers of "neutral" weather apps. They are based on global weather models, which they use to determine their forecasts. One of the most widely used apps is Meteoblue with its useful "Wheretogo" function, which can be used to display the location with the best weather within an adjustable radius.
meteoblue.com

Weather forecasts are still fundamentally inaccurate. On the one hand, this is due to global weather models, which are often unable to adequately depict local situations. On the other hand, the saying also applies here: "Forecasts are difficult, especially when they concern the future". A good approach is to consult several weather forecasts, at least three of them.