Hawaii's Year-Round Temperatures: One of the World's Narrowest Ranges

Hawaii enjoys an extraordinarily stable climate. The average annual temperature spans just 75°F to 80°F (24°C–27°C)—among the smallest ranges anywhere on Earth.

Monthly Averages

• Warmest: September–October (~80°F / 27°C)
• Coolest: January–February (~75°F / 24°C)
• Extremes: Rarely below 65°F (18°C) or above 85°F (29°C) at sea level.

What Drives This Stability?

• Trade winds: Northeast trades provide natural ventilation year-round.
• Ocean thermal inertia: Surrounding Pacific waters buffer temperature swings.
• Latitude: Tropical position (19°–22°N) minimizes seasonal sun-angle variation.

Elevation Creates Diversity

Temperature drops ~3.5°F per 1,000 ft. Summit areas (Mauna Kea, Mauna Loa, Haleakalā) regularly freeze and receive snow in winter—allowing skiing in the morning and beach swimming in the afternoon.