Hawaii offers warm, mild weather in every season. This makes it a destination that feels inviting year-round.
Average daytime temperatures on the Hawaiian Islands usually stay between the mid-70s and mid-80s Fahrenheit. These temperatures change only a little from winter to summer.
Gentle trade winds keep the air comfortable. Plenty of sunshine creates ideal conditions for outdoor activities.
The overall climate in Hawaii stays consistent, but rainfall and sunshine vary by season and location. The northeast slopes of some islands get frequent showers, while leeward coasts stay dry and sunny.
Travelers can plan the best time and place for their visit by knowing these patterns.
Each island has its own microclimates, ranging from lush rainforests to arid lava fields. A short drive can take you from warm beaches to cooler mountain air in one afternoon.
Exploring these differences makes a visit to the islands more rewarding.
Year-Round Climate Overview
Hawaii stays warm and comfortable most of the year. Temperature changes between seasons are small.
Rainfall patterns change by location. Wind direction also affects daily weather.
Tropical Climate Characteristics
Hawaii has a tropical climate that is mild compared to many other tropical regions. Temperatures rarely reach extremes, and humidity stays moderate.
The islands have two main seasons:
- Dry season: April to October
- Wet season: November to March
Rainfall depends on location. Northeast-facing slopes, such as in Hilo, get frequent showers, while leeward areas like Kona are much drier.
Some spots get over 120 inches of rain a year. Others get less than 20.
Sunshine is common, especially in coastal areas. Even during the wet season, many days are clear or partly cloudy.
This makes outdoor activities possible year-round.
Average Temperatures Throughout the Year
At sea level, the average temperature ranges from the mid-70s °F (about 24°C) in winter to the mid-80s °F (about 29°C) in summer. Higher elevations, like Haleakalā or Mauna Kea, feel much cooler.
The temperature difference between summer and winter is usually less than 10°F. Hawaii’s central Pacific location keeps these changes small.
Below is a simple look at Honolulu’s average temperatures:
| Month | Avg. Low °F | Avg. High °F |
|---|---|---|
| Jan | 66 | 80 |
| Jul | 74 | 88 |
Ocean temperatures stay warm, usually between 76°F and 81°F. Swimming is comfortable year-round.
Influence of Trade Winds and Kona Winds
Trade winds blow from the northeast most of the year. They bring cooler air, reduce humidity, and keep temperatures steady.
These winds create wetter conditions on windward coasts and drier weather on leeward sides.
Kona winds, which come from the southwest, are less common. They bring warmer, more humid air and can lead to heavy rainfall, especially during the wet season.
When trade winds weaken or shift, the islands feel hotter and stickier. Volcanic emissions, called vog, can also drift over from the Big Island and lower air quality.
For more on Hawaii’s climate patterns, see the National Weather Service climate summary.
Seasonal Weather Patterns in Hawaii
Hawaii’s tropical climate brings mild temperatures year-round. Rainfall, humidity, and wind patterns shift between months.
Trade winds keep the air comfortable. Local geography creates big differences in weather from one island or coast to another.
Summer Season: Warmth and Sunshine
From May to October, Hawaii has its dry season, called kau. Average daytime temperatures range from 27°C to 29°C (81°F to 84°F) in places like Honolulu.
Nights stay mild, often around 24°C (75°F).
Rainfall is lower during these months, especially on leeward (west) coasts. Windward (east) areas may still get showers, but they are usually brief.
The ocean stays warm, so swimming, snorkeling, and surfing are very popular.
Trade winds blow steadily and help balance the heat. Weaker winds on some days can make the air feel hotter, especially in cities.
Winter Season: Rainfall and Cooler Days
From November to April, Hawaii enters its wet season, or hooilo. Average daytime temperatures drop slightly to 23°C to 27°C (73°F to 81°F).
Nights can feel cooler, especially at higher elevations.
Rainfall increases, especially on windward coasts and in the mountains. For example, Hilo on the Big Island gets much more rain than Kona during this time.
Storm systems and winter swells bring larger waves to north-facing shores.
Despite the name “wet season,” many days stay sunny, especially in drier regions. Rain usually falls in short bursts, so you can enjoy outdoor activities between showers.
Hurricanes are rare but sometimes develop between late summer and early fall.
Best Time to Visit Hawaii
The best time to visit Hawaii depends on your priorities. For the sunniest weather and calmer seas, summer months are ideal.
However, prices and crowds are higher during summer.
Winter brings more affordable rates and excellent surfing on north shores. It is also the best time for whale watching, as humpback whales visit Hawaiian waters from December to April.
Late spring (April–May) and early fall (September–October) offer a good balance between weather and cost. These shoulder seasons bring mild temperatures, moderate crowds, and stable weather across most of Hawaii.
Regional and Island Microclimates
Hawaii’s location, varied terrain, and trade winds create distinct weather patterns within short distances. Rainfall, temperature, and humidity can change quickly, even on the same island.
Elevation and exposure to wind make a big difference.
Microclimates Across the Hawaiian Islands
The Hawaiian Islands have many microclimates, from wet rainforests to dry coastal plains. Trade winds push moist air up mountain slopes on windward (northeast) sides, causing rain.
Leeward (southwest) sides are drier and sunnier. For example, parts of Maui’s windward slopes can get over 300 inches of rain yearly, while nearby leeward areas may get less than 20 inches.
Higher elevations are cooler, and temperatures drop quickly as you climb. Some mountain areas feel much cooler than the beaches below.
You can read more about Hawaii’s diverse microclimates and how they affect daily weather.
Weather Differences: Honolulu, Hilo, and Kona Coast
Honolulu on Oahu’s south shore has a warm, dry climate most of the year. Rainfall is moderate, and sunny days are common, making it popular for beachgoers.
Hilo on the Big Island’s east side is one of the wettest cities in the United States. Frequent showers and lush vegetation make it unique.
Consistent trade winds bring ocean air into Hilo.
The Kona Coast on the Big Island’s west side is much drier. Mornings are often sunny, with clouds building in the afternoon.
Rain usually falls in short bursts later in the day.
| Location | Average Rainfall (in/year) | General Climate |
|---|---|---|
| Honolulu | ~20 | Warm, semi-dry |
| Hilo | ~130 | Wet, humid |
| Kona Coast | ~20 | Dry, sunny |
Snow in Hawaii: Mauna Kea, Mauna Loa, and Haleakala
Snow in Hawaii surprises many visitors. It falls mainly on the highest peaks: Mauna Kea and Mauna Loa on the Big Island.
Sometimes, snow also appears on Haleakala on Maui.
Snow events usually happen in winter above 11,000 feet. The air gets much colder at these heights, even though it stays warm at sea level.
Mauna Kea hosts astronomical observatories that benefit from clear, dry air. Strong winter storms bring snow to Mauna Loa, the world’s largest volcano.
Haleakala’s summit may get a light dusting, but this happens less often than on the Big Island.
Snowy conditions can make driving dangerous. Storms may cause authorities to restrict access to the summits.
Visitors should check local forecasts before planning a trip to these peaks.
