Jun 5, 2017 - 10:46 PM
in reply to jslyuan
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Check the detailed regional weather forecasts at Meteoschweiz, and then talk to the staff at the tourist information office next to track #1 in Luzern main station.
They are quite good at such recommendations...if there is a place with a halfway decent forecast, they'll likely be able to point you to it.
By the way, remember that the weather comes in layers.
Attached are some photos taken from Rigi Kaltbad when it was very cloudy.