Average Rainfall for Hawaii in August
The tables below give monthly averages for rainfall during August at cities, towns, resorts, parks and beaches in Hawaii.
Each place has a total for the amount of precipitation it usually receives this month. There is also a count of the number of days with wet weather, when precipitation amounts to 0.01 inches (0.25 millimetres) or more.
The rainfall totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.
You can jump to a separate table for each island: Hawaii Big Island, Kauai, Lanai, Maui, Molokai and Oahu
Hawaii Big Island
Places with weather information on Hawaii's Big Island include Kailua Kona in South Kona and Puukohola Heiau in the Kohala region at the north end. Plus there are rainfall data from two stations high on the slopes of mountains: the Hawaii Volcanoes Park Visitor Center at 3,970 feet (1,210 metres) and the Mauna Loa Slope Observatory at 11,152 feet (3,399 metres) elevation.
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 25 | Hawaii Volcanoes Park | 5.9 | 150 |
| 27 | Hilo | 11.3 | 287 |
| 5 | Kailua Kona | 0.5 | 14 |
| 26 | Kapoho Beach | 6.1 | 154 |
| 6 | Mauna Loa Observatory | 2.4 | 60 |
| 15 | Opihihale | 3.4 | 86 |
| 3 | Puukohola Heiau | 0.8 | 20 |
Kauai
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 3 | Barking Sands | 0.3 | 7 |
| 24 | Kilauea | 4.5 | 115 |
| 18 | Lihue | 2.3 | 59 |
| 7 | Makaweli | 0.7 | 18 |
| 26 | Princeville Ranch | 6.3 | 160 |
Lanai
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 3 | Lanai Airport | 0.4 | 9 |
Maui
Precipitation information for Maui include Kaanapali and Kapalua in West Maui, Makena on the South Shore, and Hana and Ohe'o Gulch Pools at the island's east end. The weather station in Haleakala National Park is located 6,959 feet (2,121 metres) up the mountain.
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 11 | Haleakala | 2.2 | 55 |
| 5 | Kaanapali | 0.9 | 23 |
| 7 | Kahului | 0.5 | 13 |
| 13 | Kapalua | 1.4 | 35 |
| 6 | Kula | 1.5 | 37 |
| 7 | Makena State Park | 0.8 | 21 |
| 26 | Ohe'o Gulch Pools | 6.5 | 164 |
| 5 | Puukolii | 0.9 | 23 |
Molokai
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 1 | Kaunakakai | 0.4 | 10 |
| 7 | Molokai Airport | 0.8 | 21 |
Oahu
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 4 | Ewa Beach | 0.8 | 21 |
| 6 | Honolulu | 0.8 | 21 |
| 17 | Kahuku | 2.0 | 51 |
| 21 | Kaneohe | 3.2 | 80 |
| 9 | Waikiki | 0.7 | 19 |
| 13 | Waimanalo | 2.0 | 50 |
| 23 | Waimea Falls Park | 3.2 | 82 |
Reference
NOAA National Centers for Environmental Information (NCEI). Climate Normals.