Last updated: March 2, 2024
The weather in Kailua, United States, during September is characterized by an average temperature of 26°C (79°F). Highs can soar to 29°C (84°F), while lows may dip to 23°C (74°F). Typically, the humidity level in Kailua throughout September hovers around 82%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Kailua averages 37 mm (1.5 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 12 hours 13 minutes of daylight, with the sun shining for approximately 10 hours 37 minutes each day. Additionally, there is a 59% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Kailua reaches a maximum of 12, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 10 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 2 | 5 | 8 | 11 | 12 | 12 | 10 | 7 | 4 | 2 | 1 | 0 |
| Exposure | Low | Moderate | VeryHigh | Extreme | VeryHigh | High | Moderate | Low | |||||
| Time to burn | 45 min | 30 min | 15 min | 10 min | 15 min | 25 min | 30 min | 45 min | |||||