Oahu in September
September in Oahu brings highs around 88°F (31°C), lows near 75°F and about 7 rainy days. The sun sets around 6:35 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 September is good for in Oahu
Each activity rated for September's weather and sea.
September next to August and October
| Month | August | September | October |
|---|---|---|---|
| High | 89°F (32°C) | 88°F (31°C) | 87°F (31°C) |
| Low | 76°F (24°C) | 75°F (24°C) | 74°F (23°C) |
| Rainy days | 6 | 7 | 8 |
| Sea | 80°F | 80°F | 80°F |
| Sunset | 7:03 pm | 6:35 pm | 6:08 pm |
| Daylight | 12 h 53 min | 12 h 16 min | 11 h 40 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 September 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 September?
Average highs are about 88°F (31°C) and lows about 75°F (24°C).
Does it rain much in Oahu in September?
September averages 7 rainy days, against 9 in the wettest month.
How warm is the sea in Oahu in September?
About 80°F (27°C). Warm enough for long swims and snorkeling.
