What’s the weather at Spiazzi di Gromo today? The current Spiazzi di Gromo weather is: Thunderstorm, 17 C° base and 9 C° Summit, 28 km/h wind. Scroll down to Hour by Hour for an hourly Spiazzi di Gromo weather forecast breakdown for a detailed Spiazzi di Gromo weather and snow forecast for the next seven days.