A dry window over the western Alps on Sunday

A dry window opens over the western Alps on Sunday. Chamonix and Zermatt both stay rain-free before showers return on Monday. The catch is the swing. Mornings sit near 8 to 9 degrees, afternoons climb past 20, roughly a 15-degree spread in one day. Start colder than feels comfortable, then shed layers as the valley warms. A merino base under a light shell handles both ends.