Honolulu Weather in August
United States · Tropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
August in Honolulu sees average temperatures ranging from a low of 23.3°C (73.9°F) to a high of 29.3°C (84.7°F), with a mean of 25.8°C (78.4°F). Compared to the annual average of 24.1°C (75.4°F), this month is 1.7°C warmer than the yearly norm. This is the hottest month of the year, reaching 29.3°C (84.7°F) on average. Precipitation averages 24.2mm, making it approximately 15.0mm drier than the monthly average of 39.0mm. The city receives an average of 12.5 hours of sunshine per day during August, with relative humidity averaging 69.3%. Wind speeds reach an average maximum of 24.0 km/h. For travelers, this month offers a hottest month of the year experience in Honolulu, with drier-than-average conditions compared to the rest of the year.
Honolulu sounds like a year-round summer, but the rain patterns matter. I packed for beaches in November and got three wet days — the windward side gets 4x the rain of Waikiki. The sweet spot is April-May: 26°C, low rain, fewer tourists. December-March brings the big surf and whale season, plus occasional showers. Pack reef-safe sunscreen (mandatory by law), rash guard for snorkeling, and a light rain shell for windward trips. Summer (June-August) is hotter and more humid but trade winds keep it manageable. Skip spring break crowds in March — Waikiki gets packed.
August vs Adjacent Months
| Metric | July | August | September |
|---|---|---|---|
| Mean Temp | 25.4°C (77.7°F) | 25.8°C (78.4°F) | 25.8°C (78.4°F) |
| Rainfall | 18.5mm | 24.2mm | 15.5mm |
| Sunshine | 12.7 hrs | 12.5 hrs | 11.6 hrs |
| Humidity | 70.6% | 69.3% | 69.8% |
| Wind | 26.1 km/h | 24.0 km/h | 22.5 km/h |
| Rainy Days | 20.0 | 16.0 | 17.0 |
Seasonal Context
August falls in Summer in the Northern Hemisphere. Summer brings the warmest conditions of the year with the longest daylight hours. For travelers visiting Honolulu in August, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Honolulu in August?
The average temperature in Honolulu during August ranges from 23.3°C (73.9°F) to 29.3°C (84.7°F), with a mean of 25.8°C (78.4°F).
How much does it rain in Honolulu in August?
Honolulu receives an average of 24.2mm of precipitation in August, spread across approximately 16.0 rainy days.
What should I pack for Honolulu in August?
Based on August weather data, pack lightweight, breathable clothing, sunscreen, and a hat.
Is August a good time to visit Honolulu?
August is a good time to visit Honolulu, with comfortable temperatures and manageable rainfall. However, it is the hottest month — consider early morning or evening activities.
Other Months for Honolulu
Cities with Similar August Climate (Tropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 21.31°, -157.86°. Timezone: Pacific/Honolulu. Last updated: 2026-07-30.