Outdoor weddings in Hawaiʻi can be gorgeous, especially on a beautiful secluded sandy beach. But one thing to keep in mind is the weather. In Hawaiʻi there is a rainy season (October through March) and a dry season (April through September). The upside to a wedding during the dry season months is the plentiful sunshine, but with it comes hotter temperatures. The cooler months may be better for your guest, but only if the skies hold up and stay dry.
If the sun is being fickle, console yourself with the knowledge that the most gorgeous photographs are taken on overcast days with diffuse light. The sun is high contrast and tends to be less flattering. On an overcast day, colors will also be richer and more vibrant, and faces will be more open and natural.