Middle of the drier season · Weather & things to do
Oahu in August
Little changes in Oahu from July: highs stay near 81°F (27°C), lows near 76°F (24°C), and about 1.7 in (44 mm) of rain falls.
At 91/100 for comfort (4th of 12), it's one of the best months to visit.
- Avg high
- 81°F (27°C)
- Avg low
- 76°F (24°C)
- Rain
- 1.7 in (44 mm)
- Humidity
- 74%
- Cloud cover
- 43%
- Daylight
- ~12 h 44 min
- Comfort score
- 91/100 · Great
What August feels like
Days are warm, averaging 81°F (27°C), easy weather for being outside from morning to evening.
Even at night it stays warm, around 76°F (24°C).
Rain is moderate at about 1.7 in (44 mm) for the month.
It's breezy, with average winds near 14 mph (6.1 m/s) at ground level.
Plan around August
August is one of Oahu's best months on the climate data.
- Comfort holds steady from July (93 → 91/100).
- August sits inside the Apr – Oct window our Hawaii Paradise route recommends.
What to pack for August
- Light, breathable clotheshighs average 81°F
- Sunscreen, sunglasses and a hathigh UV on clear days
- Windproof shellaverage wind 14 mph
- Comfortable walking shoesmost picks involve some walking
What to do in Oahu in August
With conditions on your side, the picks below favor time outside.
Waimea Bay Beach Park
Big North Shore bay: glassy summer swimming, huge winter surf to watch.
Why now Our curated notes say it's best summer mornings.
Hanauma Bay Nature Preserve
Protected volcanic bay with reef snorkeling and green sea turtles.
Why now August scores 91/100 for comfort, good conditions for being outside.
Mai Tai Bar at the Royal Hawaiian
Beachfront bar at the pink 1927 Royal Hawaiian for a sunset mai tai.
Leonard's Bakery
Honolulu institution since 1952 frying hot, sugar-rolled Portuguese malasadas.
Diamond Head State Monument
Steep 1.6-mile round-trip trail up a volcanic crater rim with views over Waikiki.
Why now Highs near 81°F and 1.7 in of monthly rain make this an easy outdoor pick.
Nearby in August
- Waikiki in August~15 mi · highs 83°F, 1.7 in rain · 1°C (2°F) warmer by day, about as wet
- Kailua & Lanikai in August~18 mi · highs 81°F, 1.3 in rain · similar daytime temperatures, about as wet
- Maui in August~116 mi · highs 73°F, 1.6 in rain · 5°C (8°F) cooler by day, about as wet
- Big Island in August~200 mi · highs 58°F, 5.5 in rain · 13°C (23°F) cooler by day, wetter
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Oahu in August: quick answers
Is August a good time to visit Oahu?
Yes. On the climate data it's one of the best months, scoring 91/100. Expect highs of 81°F (27°C) and 1.7 in (44 mm) of rain. August is inside the Apr – Oct window our Hawaii Paradise route recommends.
How hot is Oahu in August?
Average highs are 81°F (27°C) and average lows 76°F (24°C), making it the 2nd-warmest month by daytime highs.
Does it rain a lot in Oahu in August?
Not much: about 1.7 in (44 mm) of rain falls across August on average, the 3rd-driest month of the year. The annual total is about 30.4 in (771 mm).
What should I pack for Oahu in August?
Bring light, breathable clothes (highs average 81°F), sunscreen, sunglasses and a hat (high UV on clear days), windproof shell (average wind 14 mph) and comfortable walking shoes (most picks involve some walking).
Routes in season in August
- Hawaii Paradise Apr – Oct
Planning Oahu in August?
Share this August plan with your group, poll everyone on dates and keep the packing list in one place.