August is part of the dry season in Hawaii.
The weather in Hawaii in August is characterized by less rainfall and more sunny days compared to the wet season.
The average maximum temperatures in August range from 24°C (76°F) to 30°C (85°F) across the islands.
The average rainfall in August ranges from 5.4 mm (0.2 in) on Molokai Island to 190.9 mm (7.5 in) on Kauai Island.
The average seawater temperature in August is quite warm ranging from 26.2°C (79.2°F) to 26.6°C (79.9°F).
Keep on reading to find out more details on the weather conditions on each of the main Hawaiian islands in August in the guide below.
Average temperature
August belongs to the dry season and it’s a hot and humid month in Hawaii.
The average high and low temperatures in August on each of the main Hawaiian islands are shown in the table below.
The average high temperatures in Hawaiian islands in August range from 24°C (76°F) to 30°C (85°F) and the average low temperatures range from 16°C (61°F) to 26°C (79°F).
| Island | Average High | Average Low |
| Hawaii | 27°C / 81°F | 26°C / 78°F |
| Maui | 26°C / 78°F | 16°C / 61°F |
| Oahu (Honolulu) | 30°C / 85°F | 21°C / 71°F |
| Kauai | 24°C / 76°F | 17°C / 62°F |
| Molokai | 29°C / 83°F | 21°C / 70°F |
| Lanai | 26°C / 79°F | 19°C / 67°F |
| Niihau | 28°C / 83°F | 26°C / 79°F |
| Kahoolawe | 26°C / 80°F | 22°C / 71°F |
For a better perspective, the graph below presents the average maximum temperatures in Honolulu, the capital city of Hawaii, throughout the year.
Average seawater temperature
The table below shows the average seawater temperature on each of the main Hawaiian islands in August.
The average seawater temperature in Hawaii in August ranges from 26.2°C (79.2°F) on Kauai to 26.6°C (79.9°F) on Maui and Niihau.
Overall, the seawater temperature in Hawaii is quite warm in August, with a variance of only about 0.4°C (0.7°F) between the highest and the lowest average temperatures.
The warm ocean temperatures in August make it a great time for swimming and other aquatic sports.
| Island | Average Temperature |
| Hawaii | 26.5°C / 79.7°F |
| Maui | 26.6°C / 79.9°F |
| Oahu (Honolulu) | 26.5°C / 79.7°F |
| Kauai | 26.2°C / 79.2°F |
| Molokai | 26.3°C / 79.3°F |
| Lanai | 26.5°C / 79.7°F |
| Niihau | 26.6°C / 79.9°F |
| Kahoolawe | 26.4°C / 79.5°F |
For context, the average seawater temperature across the whole year in the Honolulu area is presented in the chart below.
Average rainfall
August is characterized by mostly dry conditions, with relatively low amounts of rainfall and sunny skies.
The table below displays the average rainfall and the number of rainy days in August on each of the main Hawaiian islands.
The average rainfall in August ranges from 5.4 mm (0.2 in) on Molokai to 190.9 mm (7.5 in) on Kauai, with the number of rainy days ranging from 0 on Molokai to 3 on several islands.
| Island | Total Rainfall | Number of Rainy Days |
| Hawaii | 47 mm / 1.9 in | 2 |
| Maui | 33.7 mm / 1.3 in | 3 |
| Oahu (Honolulu) | 11.3 mm / 0.4 in | 2 |
| Kauai | 190.9 mm / 7.5 in | 23 |
| Molokai | 5.4 mm / 0.2 in | 0 |
| Lanai | 22.7 mm / 0.9 in | 3 |
| Niihau | 49 mm / 1.9 in | 2 |
| Kahoolawe | 17.4 mm / 0.7 in | 3 |
For a more in-depth perspective, the chart below shows the average rainfall by month in Honolulu (Oahu island).
Hawaii weather in August – FAQ
Is it too hot to go to Hawaii in August?
August is one of the hottest months in Hawaii, with average high temperatures ranging from 24°C (76°F) on Kauai to 30°C (86°F) on Oahu.
If you like warm weather and don’t mind spending time in the sun, you could appreciate the weather in Hawaii in August. However, if you are sensitive to heat or prefer colder temps, it may be too hot for you.
Finally, it’s critical to assess your personal heat tolerance and plan appropriately.
Is August hurricane season in Hawaii?
The hurricane season in Hawaii lasts from June to November, with the peak months being August and September.
It is worth mentioning, however, that hurricanes are rare in Hawaii, with just around one hurricane making landfall every five years on average.
Even when a hurricane does make landfall in Hawaii, it is generally only a tropical storm when it arrives.
See more guides about Hawaii
