Water temperature in Hilo (HI) in August
Is it warm enough to swim in Hilo in August? Average water temperature in Hilo in August is 79.5°F and therefore suitable for comfortable swimming. The warmest sea in Hilo in August is 82.4°F, and the coldest is 77.2°F. Average high air temperature in Hilo in August is 83°F, and average low temperature is 69°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Hilo
Changes water temperature in Hilo in August 2025, 2024
To get an accurate forecast for the water temperature in Hilo for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Hilo, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of August.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| August 1 | 79.5°F | 79°F | 77.4°F | 80.2°F |
| August 2 | 79.3°F | 78.8°F | 77.4°F | 80.2°F |
| August 3 | 79.2°F | 78.4°F | 77.4°F | 80.2°F |
| August 4 | 79°F | 78.6°F | 77.5°F | 80.6°F |
| August 5 | 79°F | 79.2°F | 77.5°F | 80.4°F |
| August 6 | 79.5°F | 79.5°F | 77.7°F | 80.6°F |
| August 7 | 79.3°F | 79.2°F | 77.4°F | 80.6°F |
| August 8 | 79.2°F | 79.5°F | 77.2°F | 81°F |
| August 9 | 79.3°F | 79.7°F | 77.4°F | 81.1°F |
| August 10 | 79.5°F | 80.1°F | 77.5°F | 81°F |
| August 11 | 79.3°F | 79.9°F | 77.4°F | 81°F |
| August 12 | 79.5°F | 79.9°F | 77.5°F | 81°F |
| August 13 | 79.5°F | 79.9°F | 77.7°F | 81.1°F |
| August 14 | 79.7°F | 79.7°F | 77.7°F | 81.1°F |
| August 15 | 79.7°F | 79.9°F | 77.7°F | 81.1°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| August 16 | 79.9°F | 79.9°F | 77.7°F | 82°F |
| August 17 | 80.2°F | 79.9°F | 77.9°F | 81.9°F |
| August 18 | 80.2°F | 80.1°F | 77.9°F | 81.7°F |
| August 19 | 80.6°F | 80.6°F | 77.9°F | 81.5°F |
| August 20 | 80.6°F | 80.6°F | 78.1°F | 81.9°F |
| August 21 | 80.4°F | 80.6°F | 78.1°F | 81.7°F |
| August 22 | 80.6°F | 80.6°F | 78.1°F | 81.7°F |
| August 23 | 80.4°F | 80.6°F | 78.3°F | 81.7°F |
| August 24 | 80.4°F | 80.6°F | 78.1°F | 81.7°F |
| August 25 | 80.4°F | 80.2°F | 78.1°F | 81.7°F |
| August 26 | 80.2°F | 80.2°F | 77.9°F | 82°F |
| August 27 | 80.2°F | 80.2°F | 78.1°F | 82°F |
| August 28 | 80.2°F | 80.2°F | 78.1°F | 82°F |
| August 29 | 80.2°F | 79.9°F | 78.3°F | 82.4°F |
| August 30 | 80.2°F | 79.9°F | 78.1°F | 82.2°F |
| August 31 | 79.9°F | 80.2°F | 78.3°F | 82.2°F |
Average water temperature in Hilo in August over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 80.8°F | 80.4°F | 79.7°F | 81°F | 79.9°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 79.5°F | 80.1°F | 79.5°F | 79.9°F | 79.2°F |
Hilo sea state in August
Chart comparing the height of waves in Hilo in August over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.
Weather and climate in Hilo in August
This data display average monthly climate indicators in Hilo in August based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip
- Average HIGH temperature83°F
- Average LOW temperature69°F
- Average humidity
80 - Average rainfall days27 days
- Average rainfall150mm/5.9''
- Average daylight13h
- Average sunshine5.6h
- Average UV index12
Hilo water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
