What a bummer. I'm sorry that the weather is so bad. Tomorrow's forecast for Lauterbrunnen is warmer (56F) but still raining. I would leave early tomorrow for Lake Como. Take tunnels instead of passes where you can. The weather on the Italian side should be beautiful but, in fact, is only slightly better. Accuweather forecasts periods of rain tomorrow in Bellagio but at least the temperature should be about 70F with Sunday's weather being a little better.