Hawaii is generally warm year-round, but sometimes you might encounter a short cold spell when visiting in the winter months. Bring a light jacket (ideally a breathable, rainproof jacket) or sweater.
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In certain parts of Hawaii, it can also rain frequently, so it's a good idea to bring a packable lightweight rain jacket with you.
Take a light jacket or sweater, but chances are you won't even wear that. Of course, if you're planning to stargaze atop Mauna Kea volcano or see sunrise at the summit of Haleakala, you'll need heavier attire because it can dip below the 30s Fahrenheit there.
If you're looking for things to do in Honolulu when it rains, you'll find a number of exciting indoor attractions, including museums and theaters. The weather is usually sunny and warm, though, so you'll still have a chance to explore the city and take in Hawaiian art and culture on your trip.
Beach TowelYou definitely need to bring a beach towel on your Hawaii vacation, but not just any old towel will do! When packing for Hawaii, you'll want to bring a sand-resistant beach towel or blanket to lounge around on. For drying off, I suggest a quick drying microfiber towel. Leave all other bulky towels at home!
Bring a light rain jacket or waterproof poncho that can be folded up small and stashed in your backpack or beach bag during the day. If you plan on hiking rainforest trails, consider packing a waterproof hat.
Pack versatile clothing that you can mix and match, and dress up and down. Leave your denim at home! Denim feels so hot and bulky in the tropics. You will be much more comfortable in cotton or linen shorts or pants.
Hawaii itself is around 80 degrees year-round so you likely won't need these to wear there, except for maybe at night. Every single indoor place in Hawaii is air conditioned excessively which is why sometimes jeans are helpful!
Culex quinquefasciatus is found on all islands and is the most common nigh-biting mosquito in Hawaii. The immature stages of all mosquitoes occur in water; only the adult mosquito lives out of water. Up to 250 are laid singly or in clusters, depending on the species.
To prevent the spread of invasive pests and diseases, APHIS inspects all passenger bags moving from Hawaii to the U.S. mainland, Alaska, and Guam. APHIS officials perform the inspection at the airport prior to your departure. Please be prepared to open and close your own bags.