Climate & Weather in Kailua
Kailua has a real, genuinely mild, humid, windward-Oahu climate -- year-round temperatures cited around 69-84°F, with meaningfully more rainfall than leeward Honolulu due to the Koolau range's trade-wind-driven cloud and rain formation.
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Learn moreA Real, Genuinely Mild Year-Round Temperature Range
Kailua's climate is cited as warm, humid, and windy, with temperatures typically ranging from 69°F to 84°F over the course of the year, rarely below 65°F or above 86°F -- genuinely mild by mainland standards, with no real winter/summer temperature swing in the mainland sense.
Windward Oahu Gets Meaningfully More Rain Than Leeward Honolulu
Kailua receives approximately 50 inches of rain per year -- significantly more than the drier leeward side of Oahu (Honolulu/Waikiki). The Koolau Range pushes moist trade winds upward, and as the air rises it cools and forms clouds that produce rain -- a real, structural climate difference between Kailua and Honolulu this record discloses directly rather than assuming the two share identical weather.
Seasonal Rainfall Pattern
The driest month is cited as September (approximately 1.6 inches of rain), while November brings the highest average rainfall (approximately 3.0 inches). Oahu overall typically sees its highest rainfall between December and March, with winter storms and Kona storm systems bringing heavier rain during these months.
Key takeaways
- Kailua's year-round temperature range is cited around 69-84°F, genuinely mild with no real winter/summer swing.
- Kailua receives approximately 50 inches of rain per year, meaningfully more than drier, leeward Honolulu.
- Rainfall peaks between December and March, with September the driest month and November typically the wettest.
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