Kapaa — Water Temperature, Sea Conditions & Trends

Water Temperature: Daily Trends, Historical Records, and Forecast

✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health.

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 26.4°C in the next 7 days. See the table below for daily data for the upcoming week.

Table of Daily Sea Temperature Data

Annual Water Temperature Overview by Month

Monthly Water Temp Ranges

30°C

25°C

20°C

15°C

10°c

5°C

0°C

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.