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Because of its tropical climate, Volcano is considered a year round destination. With this being said, in areas of higher elevation around the volcano, the weather can become cold and rainy any time of the year. Being in the middle of the Pacific Ocean, the big island of Hawaii experiences fairly unstable weather patterns. Rainstorms can consume sunshine in the blink of an eye, and cloudy skies can clear just as fast. There is however a distinct rainy season, during which time precipitation falls nearly every day. Check out this
Climate in Hawaii page for detailed information on this subject.
On average, the warmest months of the year are August and September, during which time the daily high temperatures will hover in the low 70’s. The nighttime temperatures during these months will generally drop to the mid 50’s. In contrast, the coldest months of the year are March and April, during which time the daily highs will be in the high 60’s, and the nighttime lows will be in the low 50’s.
More important than the temperatures (because they are fairly consistent throughout the year), are the seasons. The rainy season is from November until April. The rest of the year is the dry season.
With all of this being said, always be prepared for the weather to change while in volcano. An umbrella or raincoat is essential to any day trip. When climbing in elevation, taking a warm layer of clothes is also advised.