Water temperature in Hilo (HI) in April
Is it warm enough to swim in Hilo in April? Average water temperature in Hilo in April is 76.1°F and therefore suitable for comfortable swimming. The warmest sea in Hilo in April is 78.3°F, and the coldest is 73.4°F. Average high air temperature in Hilo in April is 79°F, and average low temperature is 66°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 April 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 April.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| April 1 | 76.5°F | 75.7°F | 73.6°F | 78.1°F |
| April 2 | 76.5°F | 75.4°F | 73.4°F | 78.1°F |
| April 3 | 76.6°F | 75.2°F | 73.4°F | 78.3°F |
| April 4 | 76.8°F | 75°F | 73.4°F | 78.3°F |
| April 5 | 77.4°F | 75.2°F | 73.4°F | 78.3°F |
| April 6 | 77.5°F | 75.2°F | 73.9°F | 78.1°F |
| April 7 | 77.4°F | 74.5°F | 73.9°F | 77.9°F |
| April 8 | 77.4°F | 74.8°F | 73.9°F | 77.7°F |
| April 9 | 77.9°F | 74.7°F | 74.1°F | 78.1°F |
| April 10 | 77.7°F | 74.8°F | 74.1°F | 78.1°F |
| April 11 | 77.9°F | 75°F | 73.6°F | 77.9°F |
| April 12 | 78.1°F | 74.8°F | 73.4°F | 78.1°F |
| April 13 | 77.9°F | 74.8°F | 73.8°F | 77.9°F |
| April 14 | 77.7°F | 75°F | 73.8°F | 77.7°F |
| April 15 | 77.7°F | 75.2°F | 73.9°F | 77.7°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| April 16 | 77.7°F | 75.9°F | 73.9°F | 77.9°F |
| April 17 | 77.7°F | 75.9°F | 73.9°F | 77.9°F |
| April 18 | 77.5°F | 75.9°F | 74.1°F | 77.7°F |
| April 19 | 77.7°F | 75.7°F | 74.3°F | 77.7°F |
| April 20 | 77.5°F | 75.4°F | 74.7°F | 77.5°F |
| April 21 | 77.9°F | 75.2°F | 74.5°F | 77.9°F |
| April 22 | 77.5°F | 75.7°F | 74.5°F | 77.7°F |
| April 23 | 77.2°F | 75.9°F | 74.7°F | 77.9°F |
| April 24 | 77°F | 76.5°F | 74.8°F | 77.9°F |
| April 25 | 77°F | 76.5°F | 74.8°F | 77.9°F |
| April 26 | 77.4°F | 76.1°F | 74.8°F | 78.1°F |
| April 27 | 77.2°F | 75.9°F | 74.8°F | 78.1°F |
| April 28 | 77.4°F | 75.9°F | 75°F | 78.3°F |
| April 29 | 77.4°F | 75.9°F | 75°F | 78.1°F |
| April 30 | 77.4°F | 75.9°F | 74.8°F | 77.9°F |
Average water temperature in Hilo in April over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 77.5°F | 77.5°F | 76.5°F | 76.8°F | 76.3°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 75.7°F | 76.5°F | 75.9°F | 75.4°F | 77.4°F |
Hilo sea state in April
Chart comparing the height of waves in Hilo in April 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 April
This data display average monthly climate indicators in Hilo in April 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 temperature79°F
- Average LOW temperature66°F
- Average humidity
80 - Average rainfall days25 days
- Average rainfall254mm/10''
- Average daylight13h
- Average sunshine4.5h
- 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
