Kapaa — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Kapaa (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 Kapaa help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Kapaa 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
Water temperature in Kapaa has risen over the last week and month. Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Kapaa will be 27.1°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 |
|---|---|---|---|
| AUG 4 | 26.5°C | 27.0°C | |
| AUG 5 | 26.5°C | 26.5°C | |
| AUG 6 | 26.5°C | 26.8°C | |
| AUG 7 | 26.5°C | 27.0°C | |
| AUG 8 | 26.7°C | 26.8°C | |
| AUG 9 | 26.6°C | 27.0°C | |
| AUG 10 | 26.7°C | 26.8°C | |
| AUG 11 | 26.8°C | 27.0°C | |
| AUG 12 | 26.7°C | 26.8°C | 26.7°C |
| AUG 13 | 27.3°C | 26.8°C | |
| AUG 14 | 27.0°C | 26.8°C | |
| AUG 15 | 27.0°C | 26.9°C | |
| AUG 16 | 27.3°C | 26.9°C | |
| AUG 17 | 27.5°C | 27.0°C | |
| AUG 18 | 27.3°C | 27.1°C | |
| AUG 19 | 27.5°C | 27.1°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
Kapaa, on the eastern shore of Kauai in Hawaii, benefits from a generally warm tropical ocean year-round. Typical sea temperatures vary modestly with the seasons: winter months tend to be cooler, roughly 24–25°C, spring commonly ranges from 24–26°C, summer brings the warmest water around 26–28°C, and autumn usually sits near 25–27°C. These moderate variations mean the ocean rarely feels cold, and surface temperatures are often at their warmest from late spring through early fall. Local conditions can change day to day; trade winds, rain squalls, and seasonal north and south swells influence surface temperature locally and can create cooler pockets or warmer sheltered areas nearshore.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 23°C | 25°C | 27°C |
| February | 22°C | 25°C | 26°C |
| March | 22°C | 24°C | 27°C |
| April | 23°C | 25°C | 27°C |
| May | 23°C | 26°C | 28°C |
| June | 24°C | 27°C | 28°C |
| July | 25°C | 27°C | 28°C |
| August | 25°C | 27°C | 29°C |
| September | 25°C | 28°C | 29°C |
| October | 25°C | 27°C | 29°C |
| November | 24°C | 26°C | 28°C |
| December | 23°C | 25°C | 27°C |
* Click on a month to view detailed water temperature data.
Kapaa: Weather Forecast
August 13
August 14
August 15
August 16
Location, Beaches & Local Information
Nearby Beaches & Facilities
Fuji Beach
Waipouli Beach
Wainiha Bay
Kealia Beach
Donkey Beach
Lydgate Beach Park
Wailua Beach
Donkey Park
Anahola Beach Park
Swimming Conditions
Swimming opportunities around Kapaa range from calm, protected swimming holes and reef-protected coves to more exposed beaches with stronger surf and currents. Sheltered spots, including park-enclosed pools and gentle bays, are well suited to casual swimming and family outings when conditions are settled, and snorkeling near reefs can be rewarding where visibility is good. During summer and early fall, calmer seas make open-water swimming and water recreation more accessible, while winter’s larger swells and variable currents increase the need for caution; some beaches develop strong rip currents or shorebreaks that are not ideal for inexperienced swimmers. Visitors should choose beaches appropriate to their skill level, pay attention to posted advisories and lifeguard guidance, and favor protected areas when waters are rough.