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Kailua Weather by Month
Average temperatures, rainfall and humidity for Kailua, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Kailua month looks like before you travel — then check the live Kailua forecast for the days ahead.
Warmest month
September
30°C average high
Coolest month
January
20°C average low
Wettest month
March
98 mm of rain
Driest month
June
53 mm of rain
Average temperature and rainfall in Kailua by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 26°C | 20°C | 12°C / 29°C | 68 mm | 73% | 12 km/h |
| February | 26°C | 20°C | 14°C / 30°C | 82 mm | 73% | 14 km/h |
| March | 26°C | 20°C | 12°C / 30°C | 98 mm | 72% | 15 km/h |
| April | 27°C | 21°C | 14°C / 30°C | 76 mm | 71% | 16 km/h |
| May | 28°C | 22°C | 14°C / 30°C | 72 mm | 71% | 16 km/h |
| June | 29°C | 23°C | 19°C / 32°C | 53 mm | 70% | 17 km/h |
| July | 29°C | 23°C | 18°C / 32°C | 55 mm | 71% | 17 km/h |
| August | 30°C | 24°C | 20°C / 33°C | 55 mm | 71% | 17 km/h |
| September | 30°C | 24°C | 19°C / 32°C | 66 mm | 72% | 16 km/h |
| October | 29°C | 23°C | 17°C / 32°C | 84 mm | 75% | 13 km/h |
| November | 28°C | 22°C | 16°C / 30°C | 64 mm | 73% | 14 km/h |
| December | 27°C | 21°C | 15°C / 29°C | 84 mm | 75% | 13 km/h |
Best time to visit Kailua
The most comfortable time to visit Kailua is generally December to February, balancing mild daytime temperatures against the driest stretch of the year. Temperatures stay fairly even all year and rain concentrates around March, totalling about 857 mm a year.
Travellers who prefer heat should aim for September, when highs average 30°C. March is the month to avoid if rain would spoil your plans — it averages 98 mm, roughly 2× the rainfall of the driest month (June).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Kailua forecast for what is happening now.