What’s the weather at Gressoney-La-Trinité - Monterosa Ski today? The current Gressoney-La-Trinité - Monterosa Ski weather is: Rain showers, 16 C° base and 6 C° Summit, 10 km/h wind. Scroll down to Hour by Hour for an hourly Gressoney-La-Trinité - Monterosa Ski weather forecast breakdown for a detailed Gressoney-La-Trinité - Monterosa Ski weather and snow forecast for the next seven days.