It is worth the investment to buy an old laptop and use your cellular phone to uplink to the internet.
In the meanwhile you have on any pass road full cellular coverage in many areas with GPRS bandwith. This enables you to check the weather conditions with MeteoSwiss frequently, since the
weather in the Alps may change within hours.
The picture on the left shows the radar picture from the MeteoSwiss website. Blue means that
there is less humidity or rain, green and yellow means low rain and red is heavy rain. On this picture we would recommend to travel to the Valais county and Lake geneva, since these areas are
free of clouds.
This picture viewed as first each morning is the basic for you tour planning.