Island of Hawaii — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Island of Hawaii (Hawaii, United States). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Island of Hawaii help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Island of Hawaii in the Pacific Ocean today is 27°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Island of Hawaii will be 26.5°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUL 14 | 26.9°C | 27.0°C | |
| JUL 15 | 26.8°C | 26.5°C | |
| JUL 16 | 26.8°C | 26.8°C | |
| JUL 17 | 26.8°C | 26.5°C | |
| JUL 18 | 26.9°C | 26.5°C | |
| JUL 19 | 27.0°C | 26.8°C | |
| JUL 20 | 27.0°C | 27.0°C | |
| JUL 21 | 26.8°C | 27.0°C | |
| JUL 22 | 26.8°C | 27.0°C | 26.8°C |
| JUL 23 | 26.5°C | 26.8°C | |
| JUL 24 | 27.0°C | 26.7°C | |
| JUL 25 | 26.0°C | 26.7°C | |
| JUL 26 | 26.5°C | 26.6°C | |
| JUL 27 | 25.8°C | 26.6°C | |
| JUL 28 | 26.3°C | 26.5°C | |
| JUL 29 | 27.0°C | 26.5°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
The Island of Hawaii, commonly called the Big Island, sits in the central Pacific and exhibits a wide range of coastal conditions due to its size, varied coastline and ocean currents. Sea surface temperatures around the island are generally mild year-round, typically ranging from about 23 °C in the coolest months to around 28 °C at the warmest. Winter months (roughly December through March) see water temperatures commonly near 23–25 °C, while late spring and summer (May through September) often bring warmer waters of about 25–28 °C, with sheltered bays and shallow lagoons warming most. Local differences are noticeable: leeward Kona coasts tend to be clearer and slightly warmer, while windward and deeper-water areas near the Hilo side can be cooler, influenced by currents and upwelling.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 24°C | 25°C | 27°C |
| February | 23°C | 25°C | 26°C |
| March | 23°C | 25°C | 27°C |
| April | 22°C | 25°C | 27°C |
| May | 23°C | 25°C | 27°C |
| June | 24°C | 26°C | 28°C |
| July | 24°C | 26°C | 28°C |
| August | 25°C | 27°C | 28°C |
| September | 25°C | 27°C | 28°C |
| October | 25°C | 27°C | 29°C |
| November | 25°C | 27°C | 28°C |
| December | 24°C | 26°C | 27°C |
* Click on a month to view detailed water temperature data.
Island of Hawaii: Weather Forecast
July 23
July 24
July 25
July 26
Location, Beaches & Local Information
Swimming Conditions
Those temperatures make the Big Island attractive for a broad range of water activities without the need for thick wetsuits; most visitors swim, snorkel and free-dive in just swimwear or a light rash guard, although some prefer a thin suit for longer snorkel sessions in cooler months. The island offers diverse swimming environments from protected coral reefs and calm bays ideal for snorkeling to open-ocean beaches and surf breaks for experienced swimmers and surfers. Black-sand and rocky shorelines mean entry points vary in comfort and accessibility, and currents or rough surf can be strong at times, so choosing beaches with lifeguards or guided tours—especially for activities like manta-ray night snorkels and boat-based snorkeling—is advisable to maximize safety and enjoyment.