Middle of the drier season · Weather & things to do
Big Island in August
Big Island's warmest month brings highs averaging 58°F (14°C), lows of 43°F (6°C) and about 5.5 in (140 mm) of rain.
At 70/100 for comfort (2nd of 12), it's one of the best months to visit.
- Avg high
- 58°F (14°C)
- Avg low
- 43°F (6°C)
- Rain
- 5.5 in (140 mm)
- Humidity
- 81%
- Cloud cover
- 50%
- Daylight
- ~12 h 40 min
- Comfort score
- 70/100 · Good
What August feels like
Days are mild at around 58°F (14°C): comfortable for walking all day, with a layer for the evening.
After dark, temperatures fall to about 43°F (6°C).
Expect regular rain: about 5.5 in (140 mm) falls in the month.
Plan around August
August is one of Big Island's best months on the climate data.
- Comfort holds steady from July (71 → 70/100).
- August sits inside the Apr – Oct window our Hawaii Paradise route recommends.
What to pack for August
- A warm layer for eveningslows near 43°F
- Rain jacket and waterproof shoes5.5 in of rain on average
- Comfortable walking shoesmost picks involve some walking
What to do in Big Island in August
August is good outdoor weather here, so these picks lean toward the open air.
Puʻuhonua o Hōnaunau National Historical Park
Restored royal grounds and place of refuge on a lava shoreline.
Why now August scores 70/100 for comfort, good conditions for being outside.
Mauna Kea Visitor Information Station
Stargazing at 9,200 ft on one of the world's top observatory peaks.
Why now Highs near 58°F and 5.5 in of monthly rain make this an easy outdoor pick.
ʻAkaka Falls State Park
Short loop through rainforest to a 442-ft waterfall north of Hilo.
Why now One to do outside while the weather is on your side.
Kīlauea Iki Trail
4-mile loop through rainforest and across a still-steaming crater floor.
Tex Drive In
Roadside drive-in since 1968, famous for hot filled malasadas off Highway 19 on the Hamakua coast.
Nearby in August
- Maui in August~97 mi · highs 73°F, 1.6 in rain · 8°C (15°F) warmer by day, drier
- Kailua & Lanikai in August~185 mi · highs 81°F, 1.3 in rain · 13°C (23°F) warmer by day, drier
- Waikiki in August~185 mi · highs 83°F, 1.7 in rain · 14°C (25°F) warmer by day, drier
- Oahu in August~200 mi · highs 81°F, 1.7 in rain · 13°C (23°F) warmer by day, drier
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~1,145 m to Big Island's ~2,652 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Big Island in August: quick answers
Is August a good time to visit Big Island?
Yes. On the climate data it's one of the best months, scoring 70/100. Expect highs of 58°F (14°C) and 5.5 in (140 mm) of rain. August is inside the Apr – Oct window our Hawaii Paradise route recommends.
How cold is Big Island in August?
Average highs are 58°F (14°C) and average lows 43°F (6°C), making it the warmest month by daytime highs.
Does it rain a lot in Big Island in August?
Yes: about 5.5 in (140 mm) of rain falls across August on average, the 6th-driest month of the year. The annual total is about 71.5 in (1816 mm).
What should I pack for Big Island in August?
Bring a warm layer for evenings (lows near 43°F), rain jacket and waterproof shoes (5.5 in of rain on average) and comfortable walking shoes (most picks involve some walking).
More on Big Island
Routes in season in August
- Hawaii Paradise Apr – Oct
Planning Big Island in August?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.