Planning a trip to Hawaii in December? Awesome choice, guys! But you're probably wondering about the weather, especially the rain situation. Let's dive into what you can expect weather-wise in the Hawaiian Islands during December, so you can pack accordingly and make the most of your vacation.

Overview of Hawaii Weather in December

December in Hawaii marks the beginning of the wet season, but don't let that scare you away! The weather is still amazing compared to most places in the world during this time. Temperatures are generally warm and comfortable, hovering in the low to mid-80s during the day and dropping to the mid-70s at night. The humidity is also relatively high, so pack accordingly.

Now, about the rain. December tends to be one of the rainiest months in Hawaii, but the rainfall isn't consistent across all islands or even all parts of a single island. Some areas might experience frequent showers, while others remain relatively dry. The north and east sides of the islands tend to get more rain due to the trade winds hitting the mountains. In contrast, the south and west sides are typically drier and sunnier. So, you need to be prepared for some wet weather, but don't expect it to ruin your entire trip. Think of it as a chance to see some incredible rainbows!

Temperatures in December

When you're thinking about Hawaii in December, temperatures are a real highlight. Expect daytime highs to average around 82-85°F (28-29°C). Evenings are pleasantly cooler, usually dropping to about 72-75°F (22-24°C). This makes for comfortable sleeping conditions and enjoyable evenings out. The ocean temperature remains warm enough for swimming, surfing, and snorkeling, usually staying around 75-78°F (24-26°C). The humidity is higher in December, contributing to that tropical feel. While this might mean you'll want to pack light, breathable clothing, it also enhances the lushness of the islands, making everything appear vibrant and green.

These consistent warm temperatures make December an ideal escape from colder climates. You can leave your heavy winter coats behind and pack your favorite swimwear, light shirts, and shorts. Even though rain is more frequent in December, it rarely lasts all day. Brief showers often give way to sunshine, providing plenty of opportunities to enjoy the outdoors. Whether you're planning to hike through rainforests, relax on the beach, or explore volcanic landscapes, the temperatures in December provide a comfortable backdrop for all your adventures.

Rainfall Patterns

Understanding rainfall patterns is key to planning your December trip to Hawaii. As mentioned earlier, December is part of Hawaii's wet season. This means you should expect more rain compared to the summer months. However, the rain isn't constant and varies significantly across the islands. The windward (northeast) sides of the islands, such as the east side of Oahu and the north side of Kauai, typically receive the most rainfall. This is because the trade winds carry moisture that gets trapped by the mountains, resulting in frequent showers.

The leeward (southwest) sides of the islands, such as Waikiki on Oahu and the Kona coast on the Big Island, tend to be much drier. These areas are shielded from the trade winds by the mountains, resulting in sunnier conditions. Even on the wetter sides of the islands, the rain often comes in short bursts, followed by clear skies. It’s not uncommon to experience a brief shower in the morning and then enjoy sunshine for the rest of the day. Knowing these patterns can help you plan your daily activities. For example, you might choose to visit a rainforest or waterfall on a day when rain is expected, as these locations are particularly beautiful in the rain. Conversely, you can head to the beach on a day when the forecast predicts sunshine on the leeward side.

Island-by-Island Weather Breakdown

To really nail down your packing list and itinerary, let's break down the weather you can expect on each of the main Hawaiian Islands in December:

Oahu

Oahu is a popular destination, and in December, you'll find a mix of weather conditions. Waikiki, on the south shore, tends to be relatively dry with plenty of sunshine. However, the north shore (famous for its big wave surfing) sees more rain and cloud cover. So, if you're planning to watch the surfers, be prepared for potential showers. The central valley can also experience rain, especially in the evenings. Overall, Oahu offers a balance of sunshine and rain, making it a great choice for a December vacation.

Maui

Maui is another fantastic option, with diverse microclimates. West Maui, including areas like Kaanapali and Lahaina, is usually drier and sunnier. East Maui, home to the Road to Hana, gets significantly more rain. If you're driving the Road to Hana, be prepared for wet conditions and potential road closures due to landslides. The summit of Haleakala can be cold and rainy, so dress warmly if you plan to visit. South Maui, including Kihei and Wailea, tends to be dry and sunny, making it a great place to relax on the beach.

Kauai

Kauai, known as the "Garden Isle," is the greenest of the Hawaiian Islands, and December is one of its rainiest months. The north shore, including Hanalei and Princeville, receives the most rain. However, this also means that the waterfalls are spectacular and the vegetation is incredibly lush. The south shore, including Poipu, tends to be drier and sunnier. The Waimea Canyon, on the west side of the island, can experience variable weather, so check the forecast before you go. Despite the rain, Kauai's natural beauty makes it a worthwhile destination in December.

Big Island (Hawaii Island)

The Big Island is unique because it has so many different climate zones. Kona, on the west coast, is typically dry and sunny, while Hilo, on the east coast, is one of the wettest cities in the United States. The summit of Mauna Kea can experience snow in December, so pack accordingly if you plan to visit. Volcanoes National Park can have variable weather, with rain and fog common at higher elevations. Given its size and diverse climates, it's essential to check the specific forecast for the areas you plan to visit on the Big Island.

Activities to Enjoy in December, Rain or Shine

Even with the increased chance of rain, there are tons of activities you can enjoy in Hawaii in December. Here are some ideas:

Outdoor Adventures

• Surfing: December is prime surf season on the north shores of Oahu and Maui. Even if you're not a pro, you can take a surf lesson.
• Hiking: The trails are less crowded in December. Just be prepared for muddy conditions, especially on the wetter sides of the islands.
• Snorkeling and Diving: The water is still warm enough for snorkeling and diving. Head to the leeward coasts for the best visibility.
• Whale Watching: December marks the beginning of whale watching season in Hawaii. Humpback whales migrate to the islands to breed and give birth.

Indoor Activities

• Museums and Cultural Centers: Learn about Hawaiian history and culture at museums and cultural centers.
• Shopping: Shop for souvenirs and local crafts at the many shops and boutiques.
• Spa Days: Treat yourself to a relaxing spa day.
• Culinary Experiences: Take a cooking class or go on a food tour to sample local cuisine.

What to Pack for Hawaii in December

Okay, so you know the weather scoop. Here’s what needs to be in your suitcase:

• Lightweight Clothing: Pack light, breathable clothing that dries quickly. Think shorts, t-shirts, and sundresses.
• Swimwear: Don't forget your swimsuits, rash guards, and beach cover-ups.
• Rain Gear: A lightweight rain jacket or poncho is essential. An umbrella can also be handy.
• Waterproof Bag: Protect your electronics and valuables with a waterproof bag.
• Sunscreen: Even on cloudy days, the sun can be intense. Pack plenty of sunscreen with a high SPF.
• Insect Repellent: Mosquitoes can be more prevalent during the rainy season.
• Comfortable Shoes: Bring comfortable shoes for hiking and walking. Water shoes can also be useful for rocky beaches.

Tips for Planning Your December Trip

To make your trip as smooth as possible, keep these tips in mind:

• Book Accommodations and Activities in Advance: December is a popular time to visit Hawaii, so book your accommodations and activities well in advance.
• Check the Weather Forecast Regularly: Stay updated on the weather forecast and plan your activities accordingly.
• Be Flexible: Be prepared to adjust your plans if the weather doesn't cooperate. Have backup activities in mind.
• Respect the Local Culture: Learn about Hawaiian culture and customs and be respectful of the local community.
• Stay Safe: Be aware of potential hazards such as strong currents, slippery trails, and volcanic activity.

Conclusion

So, is Hawaii worth visiting in December, even with the chance of rain? Absolutely! The warm temperatures, fewer crowds (compared to summer), and lush landscapes make it a fantastic time to visit. Just be prepared for some rain, pack accordingly, and be flexible with your plans. With a little planning, you can have an unforgettable Hawaiian vacation, rain or shine. Aloha and happy travels! You'll have an awesome trip, and don't worry too much about the rain!