Hawaii basically has just two seasons, winter and summer:
It is very rare for it to rain continuously for days. Hurricane season is officially from June to November.
Weather wise you can visit anytime as it is pleasant. Avoid June to November if possible. "High" season is considered from mid-December to mid-April. This is when flights and accommodations are usually more expensive. The summer months are also very busy because kids are out of school. The best time to visit Maui price wise is April, May, September, October, and sometimes November.