Oahu in August
August in Oahu brings highs around 89°F (32°C), lows near 76°F and about 6 rainy days. The sun sets around 7:03 pm. The sea is about 80°F (27°C). It's a fair month: plan indoor backups.
Photo: Ossewa, CC BY-SA 4.0
What August is good for in Oahu
Each activity rated for August's weather and sea.
August next to July and September
| Month | July | August | September |
|---|---|---|---|
| High | 88°F (31°C) | 89°F (32°C) | 88°F (31°C) |
| Low | 75°F (24°C) | 76°F (24°C) | 75°F (24°C) |
| Rainy days | 7 | 6 | 7 |
| Sea | 79°F | 80°F | 80°F |
| Sunset | 7:17 pm | 7:03 pm | 6:35 pm |
| Daylight | 13 h 19 min | 12 h 53 min | 12 h 16 min |
Averages for Honolulu International Airport; sunrise and sunset on the 15th. Oahu water temperature by month.
Tours in Oahu
Oahu: Grand Tour Around Island with SnorkelingFrom $89View 
Oahu: Full or Half Day Grand Circle Island TourFrom $100View 
Pearl Harbor USS Arizona Memorial Tour from WaikikiFrom $55View 
Oahu Catamaran Snorkel Tour: See Turtles 100% GuaranteedFrom $50View 
Oahu Circle Island Snorkeling Tour: Dole, Pali Lookout & MoreFrom $118View 
Oahu Grand Circle Island Experience from WaikikiFrom $99View
Tours from Viator. Good Outing may earn a commission when you book, at no cost to you.
Questions
Is August a good time to visit Oahu?
It's a fair month: plan indoor backups. The most comfortable months overall are January, February, March, April, May and December.
How hot is Oahu in August?
Average highs are about 89°F (32°C) and lows about 76°F (24°C).
Does it rain much in Oahu in August?
August averages 6 rainy days, against 9 in the wettest month.
How warm is the sea in Oahu in August?
About 80°F (27°C). Warm enough for long swims and snorkeling.
