Hawaii’s weather is legendary — warm, gentle, and filled with sunshine year-round. Unlike most destinations, the islands enjoy a tropical climate with only two main seasons instead of four. Whether you’re visiting for beach days, volcano hikes, or whale watching, understanding Hawaii’s weather patterns helps you plan the perfect trip. This guide explains temperatures, rainfall, trade winds, and the best months to visit each island, with tips for packing and staying safe under the tropical sun.
Hawaii’s Climate Overview
Hawaii’s climate is tropical but surprisingly diverse. Temperatures remain comfortable all year, averaging 78–85°F (25–29°C) during the day and 65–75°F (18–24°C) at night. The islands are cooled by steady northeast trade winds, which keep humidity moderate and skies clear most of the time.
Because of its volcanic terrain, Hawaii’s weather can change quickly over short distances — you might experience bright sunshine at the beach and rain showers a few miles inland. This is part of what makes Hawaii’s landscapes so lush and colorful.
Dry and Rainy Seasons
Instead of four traditional seasons, Hawaii has two main ones:
- Dry Season (Kau in Hawaiian): April to October – sunny skies, low humidity, ideal for beaches and hiking.
- Rainy Season (Hooilo): November to March – slightly cooler temperatures and occasional showers, especially on north and east coasts.
Even during the rainy months, rain often comes in short bursts followed by sunshine and rainbows. You’ll rarely lose a full day of activities to bad weather.
Average Temperatures by Island
| Island | Average High (°F) | Average Low (°F) | Notes |
|---|---|---|---|
| Oʻahu (Honolulu) | 85 | 70 | Warm year-round; ocean breezes keep it pleasant. |
| Maui (Kahului) | 86 | 68 | Slightly drier on the west coast; cooler at Haleakalā summit. |
| Kauaʻi (Līhuʻe) | 83 | 70 | More rainfall, especially on the north shore. |
| Big Island (Kailua-Kona) | 85 | 68 | Dry on west coast, lush on east (Hilo) side. |
Rainfall & Microclimates
Hawaii’s rainfall patterns are shaped by its mountains and trade winds. The windward sides (northeast) are wetter, while the leeward sides (southwest) are drier and sunnier. For example, Hilo on the Big Island receives more than 120 inches of rain annually, while nearby Kona gets less than 25 inches.
Microclimates also exist due to elevation. At the top of Mauna Kea or Haleakalā, temperatures can drop near freezing at night. Travelers heading to high elevations should bring a light jacket, even in summer.
Ocean Conditions & Water Temperatures
The ocean is Hawaii’s playground — and its temperature stays pleasant all year. Average sea temperatures range from 76°F (24°C) in winter to 82°F (28°C) in summer. However, ocean conditions vary with the seasons:
- Winter (Nov–Mar): Large surf on north shores — great for watching, not swimming.
- Summer (Apr–Oct): Calmer north shores, ideal for snorkeling and family swimming.
- Year-Round: South shores (like Waikīkī) stay relatively gentle throughout the year.
Always check Hawaii Beach Safety reports before swimming, especially at unguarded beaches. See our Hawaii Beaches guide for more details on safe swimming spots.
Monthly Weather Guide
January – March
Cooler and rainier months, especially on the north and east coasts. Great for whale watching, waterfalls, and lush scenery. Bring a light rain jacket and plan indoor activities during brief showers.
April – May
Transition to dry season — warm, sunny, and less crowded. Ideal for hiking Diamond Head, exploring Waimea Canyon, or snorkeling in Hanauma Bay.
June – August
Peak summer months with long days and calm seas. Temperatures hover around 86–90°F (30°C). Perfect for beaches, luaus, and stargazing on Mauna Kea. Book early, as it’s the busiest travel season.
September – October
Shoulder season — warm water, lighter crowds, and lower prices. Ideal for surfing lessons, kayaking, and island hopping. Rain increases slightly in late October.
November – December
Start of rainy season and big-wave surf competitions on Oʻahu’s North Shore. Temperatures remain mild (mid-70s°F), and holiday season adds festive charm across the islands.
Best Time to Visit Hawaii
The “best time” depends on what you want to experience:
- For beaches and sunshine: April–October (dry season)
- For whale watching: December–March
- For fewer crowds & better prices: April–May and September–November
- For surfing: November–February (North Shore), June–August (South Shore)
Ultimately, Hawaii’s weather is wonderful year-round — you can swim in the ocean every month of the year.
What to Pack for Hawaii’s Climate
Packing light and smart makes travel easier. Here’s what to include:
- Light, breathable clothing — cotton or linen works best.
- Swimsuits, flip-flops, and a light jacket for evenings.
- Reef-safe sunscreen (required by law in Hawaii).
- Umbrella or rain poncho (especially for Kauaʻi or Hilo).
- Hiking shoes and hat for sun protection.
- Reusable water bottle — hydration is key in tropical heat.
Weather Tips & Safety
Hawaii’s weather is friendly, but the elements can still surprise travelers. Follow these local tips:
- Always wear sunscreen — UV rays are intense, even on cloudy days.
- Respect warning flags at beaches — red means strong currents.
- Bring layers when visiting volcanoes or summits — temperatures drop quickly at altitude.
- Check local forecasts at weather.gov/hfo before hikes or boat tours.
- After rain, avoid swimming near stream outlets — runoff can cloud water and attract marine life.
FAQs About Hawaii Weather
Does it rain every day in Hawaii?
No. Rain often comes in short bursts, usually in the early morning or late evening. Most days still offer plenty of sunshine.
Can I swim in the ocean year-round?
Yes. Water temperatures remain between 76–82°F (24–28°C) all year, perfect for swimming and snorkeling.
Is there a hurricane season in Hawaii?
Technically June to November, but direct hurricanes are rare. Occasional tropical storms may bring heavy rain or wind — check forecasts if visiting during late summer.
Which island has the best weather?
All islands enjoy similar tropical conditions. Oʻahu and Maui have the sunniest coasts, while Kauaʻi and Hilo (Big Island) are greener and wetter.
What’s the coldest month in Hawaii?
January tends to be the coolest, with average highs around 78°F (26°C) — still perfect for outdoor fun.
