It's not raining everywhere, far from that: many regions in the Southwest and Northwest have some sunshine today. In any case, good weather on a Sunday in spring is supposed to be bad for the turnout.

As for Mélenchon voters, polls showed those who will go and vote, to split two thirds for Macron and one third for Le Pen. As much as many people don't care much for Macron, they care even less for Le Pen.