I'm planning to hitchhike around Europe for 2 weeks and

You can almost always find shelter when you need it in Europe. Cow sheds, tool sheds, bus stops...that being said, a tarp weighs nothing, so there's no reason not to bring one, plus some paracord to string it up (practice this at home before you try doing it in the dark in the pissing rain)

>>1261972
>I'm not expecting any rain.

Did you double check this with God?

btw, where are you going?

>>1261972
>for 2 weeks and I'm not expecting any rain
Forecasts aren't very accurate that far ahead.

It will rain and then you'll just get wet. It's summer, how bad it can be?