Why Is Hawaii Hot? Causes and Heat Countermeasures

Hawaii, USA, is known as a tropical paradise with constant summer weather, but in fact, the perception of heat varies depending on the region and elevation. Here, we explain in detail the causes of heat in Hawaii, heat countermeasures, and cool spots.

1. Causes of Heat in Hawaii

1-1. Tropical Climate

• Hawaii is located near the equator in the tropics, so temperatures remain relatively high throughout the year.
• Average temperatures range from 25 to 30°C, with summer days sometimes exceeding 30°C.

1-2. High Humidity

• Surrounded by the ocean, humidity is high, making it easy to feel sticky and hot.
• High humidity slows sweat evaporation, increasing the perceived temperature.

1-3. Influence of Wind

• Areas where the trade winds blow feel cooler due to the breeze, but regions with weak winds tend to feel hotter.

1-4. Solar Altitude and Daylight Hours

• The sun stays high in the sky for long hours year-round, resulting in strong and prolonged sunlight.

2. Heat Countermeasures in Hawaii

2-1. Personal Level

• Use sunscreen, hats, and sunglasses for UV protection.
• Frequently hydrate to prevent heatstroke.
• Choose breathable clothing.

2-2. Indoor and Living Environment

• Use fans and air conditioners to maintain comfortable indoor temperatures.
• Install blackout curtains to block direct sunlight.
• Use shade outdoors when possible.

2-3. Community Level

• Utilize cooling centers such as public facilities, shopping malls, and libraries.
• Gather information and take action when heat advisories are issued.

3. Cool Spots (Places to Escape the Heat)

3-1. Mountainous Areas (High Elevations)

• Places like Mauna Kea (over 4,200 m elevation) and Mauna Loa stay cool year-round with lower temperatures even in summer.
• The highlands of the Big Island experience large temperature differences between day and night.

3-2. Windward Side Where Trade Winds Blow (e.g., North Shore)

• Areas with strong winds have good ventilation and feel cooler.

3-3. Coastal Beach Resorts

• Sea breezes lower the perceived temperature, making places like Kailua and Kapalua relatively comfortable.

4. Summary