Koa treeThe following is current weather and forecast for the Volcano, Hawai'i. Approximately 30 miles south of Hilo, the Volcano area is at an elevation of 4,000' and temperatures tend to be 10 to 15 degrees cooler than at sea level. Volcano's weather can be variable, from clear and warm to cool and rainy. Dressing in layers and being prepared for rain is always a good idea. In Volcano, average yearly rainfall varies between 100" and 125" with temperatures usually between 50 to 75 degrees.