Impossible to predict. You could check the local weather site closer to when you want to go. At the moment day temps are mainly in the mid teens celsius and rain on two of the next five days, cloudy the others. Click on Temuco on the map of Chile and it will show Pucon on the map which pops up.
Yes wait till the last minute and go only if the forecast is good. You can book a nightbus on the same day.
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