The Hawaiian Islands offer a range of microclimates due to the volcanoes’ barrier effect. Weather varies greatly between sunny beaches, chilled mountain peaks, humid tropical forests and arid deserts. The season from December to April is most likely to offer good weather with pleasant average temperatures between 20°C (68°F) and 26°C (79°F).
Temperatures in Hawaii stay quite constant throughout the year. At sea level, the highest recorded temperature is about 35°C (95°F), while the lowest is about 11°C (52°F). Another factor that influences the climate is elevation; the Mauna Kea volcano amounts to 4,207 m (13,796 ft).
As you go higher, the temperature gets colder, with freezing temperatures and snowfall during winter. Knowing what the average temperatures and the number of rainy days will likely be at the time of your trip will help you determine if this is the best time to dive in Hawaii.
Hawaii average weather
You will find below, month by month, the average weather conditions in Hawaii:
Hawaii average temperatures
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec | |
| max | 25°C 77°F | 25°C 77°F | 25°C 77°F | 25°C 77°F | 27°C 81°F | 27°C 81°F | 28°C 82°F | 28°C 82°F | 28°C 82°F | 28°C 82°F | 27°C 81°F | 25°C 77°F |
| min | 20°C 68°F | 20°C 68°F | 20°C 68°F | 21°C 69°F | 22°C 71°F | 22°C 71°F | 23°C 73°F | 23°C 73°F | 23°C 73°F | 23°C 73°F | 22°C 71°F | 21°C 69°F |
Hawaii average number of rainy days
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| 6 | 7 | 8 | 9 | 10 | 10 | 10 | 10 | 9 | 7 | 7 | 7 |
Hawaii weather data source: weatherspark.com
Oahu weather
You will find below, month by month, the average weather conditions in Oahu (the weather forecast of reference is Honolulu):
Oahu average temperatures
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec | |
| max | 25°C 77°F | 24°C 75°F | 24°C 75°F | 25°C 77°F | 26°C 79°F | 27°C 80°F | 27°C 80°F | 28°C 82°F | 28°C 82°F | 27°C 80°F | 26°C 79°F | 25°C 77°F |
| min | 21°C 69°F | 21°C 69°F | 21°C 69°F | 22°C 71°F | 23°C 73°F | 23°C 73°F | 24°C 75°F | 24°C 75°F | 24°C 75°F | 24°C 75°F | 23°C 73°F | 22°C 71°F |
Oahu average number of rainy days
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| 3 | 4 | 5 | 4 | 3 | 2 | 2 | 3 | 2 | 3 | 3 | 3 |
Hawaii weather data source: weatherspark.com
Maui weather
You will find below, month by month, the average weather conditions in Maui (the weather forecast of reference is Kahului):
Maui average temperatures
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec | |
| max | 27°C 81°F | 27°C 81°F | 27°C 81°F | 27°C 82°F | 29°C 84°F | 30°C 86°F | 30°C 87°F | 30°C 87°F | 30°C 87°F | 30°C 86°F | 29°C 84°F | 27°C 81°F |
| min | 18°C 65°F | 18°C 65°F | 19°C 66°F | 19°C 67°F | 20°C 69°F | 22°C 71°F | 22°C 72°F | 23°C 73°F | 22°C 72°F | 22°C 71°F | 21°C 69°F | 19°C 67°F |
Maui average number of rainy days
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| 6 | 5 | 6 | 4 | 3 | 2 | 2 | 3 | 3 | 4 | 5 | 6 |
Hawaii weather data source: weatherspark.com
Big Island weather
You will find below, month by month, the average weather conditions in Big Island, the nickname of the island of Hawai’i (the weather forecast of reference is Hilo):
Big Island average temperatures
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec | |
| max | 24°C 75°F | 24°C 75°F | 24°C 75°F | 24°C 75°F | 25°C 77°F | 25°C 77°F | 26°C 79°F | 26°C 79°F | 26°C 79°F | 26°C 79°F | 25°C 77°F | 24°C 75°F |
| min | 20°C 68°F | 20°C 68°F | 20°C 68°F | 21°C 69°F | 22°C 71°F | 22°C 71°F | 23°C 73°F | 23°C 73°F | 23°C 73°F | 23°C 73°F | 22°C 71°F | 21°C 69°F |
Big Island average number of rainy days
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| 10 | 12 | 13 | 19 | 23 | 25 | 24 | 25 | 20 | 15 | 12 | 12 |
Hawaii weather data source: weatherspark.com
Other factors, of course, such as the water temperature, can have an impact on when you are booking your trip to scuba dive in Hawaii. In this case, it is better to check Hawaii water temperature information.