Hilo water temp
This data the coastal Hilo ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current ocean temperature in Hilo
Water temperature in Hilo today is 80.6°F. Based on our historical data over a period of ten years, the warmest water in this day in the Pacific Ocean near Hilo was recorded in 2015 and was 82.2°F, and the coldest was recorded in 2010 at 78.4°F. Sea water temperature in Hilo is expected to drop to 80.2°F in the next 10 days. September average water temperature in Hilo is 80.1°F, the minimum temperature is 77.5°F, and the maximum is 83.8°F.
The swimming season in Hilo lasts from January to December, twelve months per year! During those months, Hilo water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Hilo in winter reaches 76.6°F, in spring 76.3°F, in summer the average temperature rises to 78.8°F, and in autumn it is 79.5°F.
Hilo water temperature now
| September 16, 2025 |
|---|
| today temp |
| 80.6°F |
| September 15, 2025 |
|---|
| yesterday temp |
| 80.8°F |
The ocean salinity in Hilo is 34.71‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Hilo for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Hilo. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Hilo. Data in table shown for September 16, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 5' 7" | 5' 7" | 5' 6" | 5' 4" |
| 1.71 m | 1.71 m | 1.68 m | 1.63 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 5' 2" | 5' 0" | 4' 10" | 4' 9" |
| 1.58 m | 1.53 m | 1.48 m | 1.45 m |
Surf report in Hilo
Hilo weather forecast
Current temperature and weather
Data in a table show Hilo temperature today (September 16, 2025). For more information and forecast for a few days, go to the weather forecast Hilo.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | | |
| 72.9°F | 71.6°F | 70.7°F | 75.9°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
|  | |  |
| 77.5°F | 76.3°F | 72.5°F | 73.4°F |
You may also be interested in other sections of our site for Hilo: Sunrise and Sunset, Tides
Hilo water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Hilo. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Hilo on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 76.5°F | 74.3°F | 78.8°F | warm |
| Ocean water temperature in Hilo in January | ||||
| February | 75.9°F | 73°F | 77.5°F | warm |
| Ocean water temperature in Hilo in February | ||||
| March | 75.6°F | 72.1°F | 78.3°F | warm |
| Ocean water temperature in Hilo in March | ||||
| April | 76.1°F | 73.4°F | 78.3°F | warm |
| Ocean water temperature in Hilo in April | ||||
| May | 77.2°F | 74.8°F | 79.3°F | hot |
| Ocean water temperature in Hilo in May | ||||
| June | 78.1°F | 75.4°F | 79.9°F | hot |
| Ocean water temperature in Hilo in June | ||||
| July | 79°F | 76.1°F | 81.1°F | hot |
| Ocean water temperature in Hilo in July | ||||
| August | 79.5°F | 77.2°F | 82.4°F | hot |
| Ocean water temperature in Hilo in August | ||||
| September | 80.1°F | 77.5°F | 83.8°F | hot |
| Ocean water temperature in Hilo in September | ||||
| October | 79.7°F | 77.7°F | 82°F | hot |
| Ocean water temperature in Hilo in October | ||||
| November | 78.8°F | 76.1°F | 81.9°F | hot |
| Ocean water temperature in Hilo in November | ||||
| December | 77.5°F | 75°F | 80.1°F | hot |
| Ocean water temperature in Hilo in December | ||||
Chart monthly average water temperature in Hilo
