Hilo, Hawaii weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: January – December
What is the weather like in Hilo, Hawaii in August?
In August, Hilo, Hawaii is warm: daytime highs average 26 °C, and even at night it stays warm at around 22 °C. The sea averages 26.3 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. It is the rainy season: rain falls on about 23 days, totalling 131 mm. The air is often humid and muggy. All in all, August is a good month for a holiday in Hilo, Hawaii.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 69 | 68 | 66 |
| Day | 26° | 26° | 26° |
| Night | 21° | 22° | 22° |
| Sea | 26° | 26° | 27° |
| Sun | 9 h | 8 h | 8 h |
| Rain days | 24 | 23 | 21 |
More details for August
- Daylight
- 12 h 49 min06:01 – 18:50
- UV index
- 12 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 56 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC−10Pacific/Honolulu
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %90 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Hilo, Hawaii in August: quick answers
Is Hilo, Hawaii hot in August?
Warm rather than hot: in August, daytime highs in Hilo, Hawaii average 26 °C and nights cool to about 22 °C.
Can you swim in Hilo, Hawaii in August?
Yes. In August the sea averages 26.3 °C – lovely and warm for swimming.
Does it rain much in Hilo, Hawaii in August?
It rains often – on about 23 days, adding up to 131 mm.
Hilo, Hawaii month by month
The whole year in Hilo, HawaiiAll destinations: USAHawaii weather in AugustWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences