Oahu in August
Weather, crowds, and prices — and whether August is your month.
Quick answer · Good
Warmest month; ocean like bathwater. Expect highs around 89°F, very little rain, peak crowds, and above average.
89/74°F
Typical high / low
Very little rain
Rain
Peak crowds
Crowds
Above average
Prices
The bigger picture for Oahu
- Best overall: April-May and September-October for the best balance.
- Best value: September-October: summer-calm water, shoulder prices.
- Watch out for: Late December-early January: peak prices; big winter surf closes North Shore swimming.
Oahu month by month
| Month | High/Low | Rain | Crowds | Prices |
|---|---|---|---|---|
| January | 80/66° | Regular showers | Peak crowds | Peak prices |
| February | 80/65° | Regular showers | Busy | Peak prices |
| March | 81/67° | Regular showers | Peak crowds | Peak prices |
| April | 83/68° | Occasional showers | Busy | Above average |
| May | 85/70° | Occasional showers | Moderate | Good value |
| June | 87/72° | Very little rain | Busy | Above average |
| July | 88/73° | Very little rain | Peak crowds | Peak prices |
| August ← | 89/74° | Very little rain | Peak crowds | Above average |
| September | 88/73° | Very little rain | Moderate | Good value |
| October | 87/72° | Occasional showers | Moderate | Good value |
| November | 84/70° | Regular showers | Moderate | Good value |
| December | 81/67° | Regular showers | Peak crowds | Peak prices |
Planning a August trip?
Browse the Oahu guides — the full destination profile, all-inclusive resorts, family trips, and honeymoons — or skip the research entirely.
Want August priced for your exact dates?
Courtney Geisel, an independent travel advisor, prices real Oahu trips every week — free, because resorts pay her, not you.
Get my August quote — free