Dolomites weather and afternoon storms — how to read the day

From mid-July to late August the typical Dolomites weather day looks the same: clear and cold at dawn, sunny and warming through mid-morning, scattered cumulus building from around 12:00, towering cumulonimbus over the high peaks by 14:00–15:00, and a 30–60 minute storm with lightning, hail and a sharp temperature drop between 14:00 and 17:00. Then it clears again by evening.

The implication for walking: leave the hut by 7:00, take your big ascent in the morning, and be off any exposed ridge, summit or via ferrata by 13:00. Treat 14:00 as the cut-off for the day's hard work, not the start of the afternoon.

Three sources cover the Dolomites well, all free and in English where possible.

Rifugio wardens look at the same three regional sites every evening and give an honest opinion at dinner. Ask. 'Che tempo fa domani?' is enough; the answer will be more useful than any app.

Cumulus growing vertically into anvils with hard edges by 12:00 means a storm by 15:00 — descend now. Lenticular clouds (smooth lens shapes) on the high peaks mean strong winds aloft; not immediately dangerous but uncomfortable on ridges. A general grey ceiling with no convection often passes without thunderstorms — colder and wetter, less electrically dangerous.

Wind dropping suddenly and the air going still and warm in the early afternoon is the classic pre-storm signal in the mountains. Move.

If you can hear thunder, you're already within strike range — the rule of thumb is 10 km per 30 seconds between flash and rumble. Get off the summit, off the ridge, and off any via ferrata cable (which conducts) immediately. Drop 50–100 metres of elevation if possible.

If you can't descend, find a position low and away from the highest point: crouch on your pack with your feet together, knees up, hands off the ground. Don't shelter under an isolated tree or a cave entrance — both attract strikes. Stay 30 metres apart from your companions so a single strike can't take the whole group.

First snow on the highest passes (above 2,800 m) is possible from 1 September and likely from 20 September. By 15 October the high routes are usually snowbound and impassable without winter gear.

Spring snow lingers in north-facing couloirs into early July in heavy winters. The passes most prone to late snow are Forcella del Lago and Forcella Marmolada (AV2), Forcella del Marmarole (AV4), and the col between Tissi and Vazzoler on AV1. Phone the relevant rifugi a week ahead in June and ask about conditions.