Big Island Weather: A Month-by-Month Guide

Oct 29, 2025 by Jhon Lennon 43 views

Hey guys, if you're planning a trip to the Big Island of Hawaii, you're in for a treat! This place is paradise, but understanding the weather on the Big Island by month is key to making your trip amazing. That's why I put together this month-by-month guide. We'll dive into the details, so you know exactly what to expect, from sunshine and showers to the best times for specific activities. The Big Island is huge, with diverse microclimates, so knowing what to expect can really help you pack smart and enjoy your vacation to the fullest. Whether you're into surfing, hiking, or just chilling on the beach, this guide has got you covered. Let's get started and explore the Big Island weather!

January: Kicking Off the Year with Sunshine

Alright, let's kick things off with January weather on the Big Island. Generally, January is a fantastic time to visit! You can usually expect pleasant temperatures, with average highs in the low 80s Fahrenheit (around 27-28 Celsius) during the day. The evenings cool down a bit, often dipping into the high 60s or low 70s Fahrenheit (around 20-22 Celsius). Rainfall is typically moderate, especially on the windward side (east side) of the island, where you might experience more frequent showers. But don't worry too much – these showers usually pass quickly, and you'll often see rainbows! The sunshine hours are still plentiful, so you can definitely plan on getting plenty of beach time and outdoor adventures in. January is also a great time for whale watching, as humpback whales migrate to the warm Hawaiian waters. The ocean conditions are generally pretty good for swimming and water activities. If you're heading to higher elevations, like the summits of Mauna Kea or Mauna Loa, be prepared for much cooler temperatures and potentially snowy conditions. Pack accordingly! For those looking for Big Island weather in January, you're in for a treat. It's a sweet spot before the peak tourist season really hits.

Activities to Enjoy in January

Whale Watching: Take a boat tour or head to a coastal lookout for a chance to spot humpback whales.
Beaches: Enjoy the beaches with cooler temperatures. Perfect for swimming and relaxation.
Hiking: Explore the island's many trails, keeping an eye on the weather forecast for higher elevations.

February: Continuing the Hawaiian Charm

As we move into February on the Big Island, the weather patterns continue to be quite favorable. You can expect very similar conditions to January, with consistent temperatures in the low 80s Fahrenheit (around 27-28 Celsius) during the day and evenings in the high 60s to low 70s Fahrenheit (around 20-22 Celsius). Rainfall patterns are also consistent, with the windward side of the island experiencing more showers than the leeward (west) side. Again, these showers are usually short-lived and add to the island's lush beauty. February weather provides plenty of sunshine, making it an excellent time to explore the island's diverse landscapes. The ocean conditions continue to be good for various water activities, including swimming, snorkeling, and diving. The Big Island weather in February is very attractive. It's a great time to avoid the peak tourist crowds and enjoy the island's tranquility. You will be able to enjoy the beautiful scenery. The whales continue to grace the waters around the island, offering more chances for unforgettable whale-watching experiences. Make sure to pack layers, especially if you plan to visit higher elevations, as the temperatures can drop significantly.

Activities to Enjoy in February

Whale Watching: Opportunities remain excellent for whale watching.
Snorkeling and Diving: Explore the island's vibrant coral reefs and marine life.
Exploring Volcanoes National Park: Visit the active volcano and witness the awe-inspiring geological formations.

March: Transitioning to Warmer Days

Alright, let's talk about March weather on the Big Island. This month marks a transition into warmer and drier conditions. Average temperatures start to creep up slightly, with daytime highs still in the low to mid-80s Fahrenheit (around 28-29 Celsius), but you might start to feel the warmth more consistently. Evenings remain comfortable, with temperatures in the low 70s Fahrenheit (around 22 Celsius). Rainfall tends to decrease, especially on the leeward side of the island. The windward side might still see some showers, but they become less frequent. March weather offers a great balance of sunshine and pleasant temperatures, perfect for outdoor activities. The ocean conditions remain favorable for water activities. Big Island weather in March is starting to get more predictable, it's a sweet spot between the wetter winter months and the hotter summer months. The island is starting to get ready for the influx of tourists, making it a great time to visit before the crowds really pick up. Consider bringing lighter clothing and sun protection, as the sun's intensity starts to increase. You can enjoy the outdoor activities you have been waiting for.

Activities to Enjoy in March

Hiking: Explore the island's trails under the warming sun.
Water Activities: Swimming, snorkeling, and diving are great options.
Sightseeing: Discover the island's beautiful landscapes.

April: The Sweet Spot for Sunshine

Hello, April! April weather on the Big Island is considered by many to be one of the best times to visit. You'll find consistently warm and sunny weather. Daytime temperatures are typically in the mid-80s Fahrenheit (around 29-30 Celsius), with comfortable evenings in the low 70s Fahrenheit (around 22 Celsius). Rainfall is minimal across most of the island, and the humidity is usually quite manageable. The sunshine hours are at their peak, making it ideal for beach days, exploring, and enjoying all the outdoor activities the island has to offer. The Big Island weather in April is a big win! You can be sure you'll get great sunshine and pleasant weather. The ocean conditions are usually calm and clear, perfect for swimming, snorkeling, and diving. It's an excellent time to explore the various beaches and coastal areas. However, keep in mind that the shoulder season is starting, so the tourist numbers may begin to increase. If you are lucky, you will experience the amazing scenery of this beautiful island. Pack your sunscreen and your favorite swimwear, because you're in for a treat!

Activities to Enjoy in April

Beaches: Spend your days relaxing and swimming on the island's stunning beaches.
Snorkeling and Diving: Discover the colorful marine life.
Island Exploration: Explore the island's diverse landscapes and attractions.

May: Embracing the Summer Heat

As we move into May on the Big Island, the weather continues to warm up, signaling the start of the summer season. You can expect daytime temperatures to be in the high 80s Fahrenheit (around 30-31 Celsius), and evenings remain warm, with temperatures in the mid-70s Fahrenheit (around 23-24 Celsius). Rainfall remains low, with sunny skies dominating most days. May weather is perfect for those who love warm, sunny days. The humidity starts to increase a bit, but it's generally still very comfortable. The ocean conditions continue to be ideal for water activities. Big Island weather in May provides the perfect conditions for a beach vacation. As the summer season approaches, the tourist numbers may start to increase. Keep in mind that the sun's intensity is strong during this time, so make sure to protect yourself with sunscreen, hats, and sunglasses. You will surely be able to have great outdoor activities!

Activities to Enjoy in May

Beaches: Enjoy the sun and ocean on the island's beautiful beaches.
Water Activities: Swimming, snorkeling, and diving remain popular choices.
Hiking: Continue exploring the island's trails.

June: Peak Summer Days

Welcome to June on the Big Island! The summer heat is in full swing. Daytime temperatures often reach into the high 80s or even low 90s Fahrenheit (around 31-33 Celsius), and the evenings are warm, with temperatures in the mid-70s Fahrenheit (around 23-24 Celsius). Rainfall is minimal, with mostly sunny skies. June weather is perfect for those who love hot, sunny days and water activities. You will be able to enjoy the ocean. The ocean conditions are usually calm and clear, making it a great time for swimming, snorkeling, and diving. Big Island weather in June is at its peak. Be prepared for strong sunshine and high temperatures. Remember to stay hydrated and protect yourself from the sun. The summer is a great time to enjoy the amazing activities. As the tourist season is in full swing, you can expect more crowds at popular attractions and beaches. Plan ahead and consider making reservations for tours and activities.

Activities to Enjoy in June

Beaches: Spend your days enjoying the sun, sand, and ocean.
Water Activities: Swimming, snorkeling, diving, and surfing are popular.
Island Exploration: Explore the island's diverse landscapes and attractions.

July: Hot and Sunny Continues

As we continue into July on the Big Island, the hot and sunny weather persists. Daytime temperatures remain in the high 80s or low 90s Fahrenheit (around 31-33 Celsius), and evenings stay warm in the mid-70s Fahrenheit (around 23-24 Celsius). Rainfall is still minimal, with plenty of sunshine. The July weather is perfect for anyone who loves the heat. You can be sure you'll get plenty of sun and warmth. The ocean conditions remain ideal for water activities. Big Island weather in July is perfect for swimming, snorkeling, and diving. It's a great time to enjoy the beaches and explore the island. However, be prepared for increased crowds and higher prices, as it's a popular vacation time. Be sure to stay hydrated and protect yourself from the sun. Have fun and enjoy the nice weather!

Activities to Enjoy in July

Beaches: Relax on the island's beautiful beaches.
Water Activities: Enjoy swimming, snorkeling, diving, and surfing.
Island Exploration: Discover the island's diverse landscapes and attractions.

August: Still Sunny and Warm

Moving into August on the Big Island, the weather remains consistently warm and sunny. Daytime temperatures continue to be in the high 80s or low 90s Fahrenheit (around 31-33 Celsius), and evenings stay warm in the mid-70s Fahrenheit (around 23-24 Celsius). Rainfall remains low, with clear skies dominating most days. August weather is ideal for those who love hot weather and beach vacations. You'll definitely experience plenty of sunshine and warmth. The ocean conditions are ideal for water activities. Big Island weather in August offers great conditions for swimming, snorkeling, and diving. Keep in mind that it's a popular vacation time, and prices may be higher. The beaches are perfect for relaxation and sunbathing. Make sure to pack accordingly, protect yourself from the sun, and stay hydrated. Remember to have fun.

Activities to Enjoy in August

Beaches: Spend your days enjoying the sun and ocean on the island's beaches.
Water Activities: Swim, snorkel, dive, and surf.
Island Exploration: Explore the island's diverse landscapes and attractions.

September: Transition to Shoulder Season

As we enter September on the Big Island, we start to see a transition towards the shoulder season. The weather remains warm and sunny, with daytime temperatures still in the high 80s Fahrenheit (around 30-31 Celsius) and evenings in the mid-70s Fahrenheit (around 23-24 Celsius). Rainfall may start to increase slightly, especially on the windward side of the island. The September weather is still great for a vacation. You can get lots of sunshine and warmth. The ocean conditions are still suitable for water activities. Big Island weather in September provides excellent conditions for swimming, snorkeling, and diving. It is a wonderful time to explore the island and enjoy various outdoor activities. The crowds start to thin out a bit as the peak summer season ends, making it a great time to visit. Enjoy the beautiful places this island has to offer. Always be prepared for a potential change in the weather, and pack accordingly.

Activities to Enjoy in September

Beaches: Enjoy the sun and ocean.
Water Activities: Great for swimming, snorkeling, and diving.
Island Exploration: Discover the island's diverse landscapes.

October: Welcoming the Fall Season

Welcome, October on the Big Island! The weather continues to transition into fall, but it remains beautiful and warm. Daytime temperatures are typically in the mid-80s Fahrenheit (around 29-30 Celsius), with comfortable evenings in the low 70s Fahrenheit (around 22 Celsius). Rainfall starts to increase a bit more, especially on the windward side, but you can still expect plenty of sunshine. The October weather is great for a vacation. The heat is still here, but there's a nice breeze. The ocean conditions are still great for water activities. Big Island weather in October offers a nice balance of warmth and sunshine. It is a fantastic time to enjoy outdoor activities and explore the island. The tourist crowds are usually smaller compared to the summer months, providing a more relaxed atmosphere. It's a great time to visit. Be ready for some showers and pack accordingly. Get ready to enjoy the beautiful scenery!

Activities to Enjoy in October

Beaches: Enjoy the beaches with lovely weather.
Water Activities: Continue enjoying swimming, snorkeling, and diving.
Hiking: Explore the island's trails.

November: Preparing for Winter

As we head into November on the Big Island, the weather continues to become cooler. Daytime temperatures are typically in the low to mid-80s Fahrenheit (around 27-29 Celsius), with evenings in the high 60s or low 70s Fahrenheit (around 20-22 Celsius). Rainfall starts to increase more noticeably, especially on the windward side. The November weather provides a good balance between sunshine and rain. The temperature is not too hot and you'll get a nice breeze. The ocean conditions are still favorable for water activities. Big Island weather in November is great for escaping the colder weather. You can enjoy various activities with a reasonable temperature. The tourist crowds are significantly smaller, making it a more relaxing time to visit. Get ready to enjoy the beautiful scenery.

Activities to Enjoy in November

Beaches: Enjoy the sun and beautiful beaches.
Water Activities: Swim, snorkel, and dive.
Island Exploration: Explore the island's beautiful attractions.

December: Holiday Cheer and Mild Weather

And finally, we arrive at December on the Big Island. The weather continues to cool down, with daytime temperatures typically in the low 80s Fahrenheit (around 27-28 Celsius) and evenings in the high 60s or low 70s Fahrenheit (around 20-22 Celsius). Rainfall is typically moderate, especially on the windward side. December weather is a good time to visit. The weather isn't too hot, and the scenery is nice. The ocean conditions are usually still good for water activities. Big Island weather in December provides a nice escape from the cold. A good time to enjoy the beaches and the outdoors. While it's a popular time for tourists, it's still more manageable than the peak summer months. It's a great time to enjoy the holiday festivities and enjoy the beautiful scenery.

Activities to Enjoy in December

Whale Watching: Humpback whales start to arrive.
Beaches: Enjoy the sun and the beach.
Holiday Festivities: Participate in the holiday celebrations.

So there you have it, guys! A month-by-month guide to the weather on the Big Island. No matter when you choose to visit, you're bound to have an amazing time. Just remember to pack accordingly and be prepared for the diverse microclimates across the island. Enjoy your trip!