How do weather conditions affect a via ferrata tour?

Thunderstorms - Stop immediately or do not start at all.
The biggest risk on a via ferrata is a thunderstorm. The steel cable acts as a lightning conductor. A direct strike or nearby discharge can be fatal. Never start if there is a risk of thunderstorms. On the route, take warning signs seriously and retreat if necessary.

Storms and wind
Strong wind is especially dangerous on suspension bridges, ridges, or exposed sections. It can throw you off balance and make clipping and unclipping difficult. If a storm warning exists, postpone the tour. Do not take risks.

Start early, watch the weather
Weather changes faster in the mountains than in the valley. Starting early helps you return to safe terrain before possible afternoon thunderstorms. Dark cumulus clouds, increasing wind, or distant thunder are signs to act.

June to September
Weather is usually stable, days are long, and temperatures are pleasant. In May, snow may still be present; in October, snowfall is possible again.

When in doubt: go with a guide
If you are unsure about the weather, go with a guide. They assess conditions, plan accordingly, and know alternative routes. Especially in uncertain weather, this is the safer option.