World sea water temperatures

Water temperature in Hapuna Beach (HI) in September

Is it warm enough to swim in Hapuna Beach in September? Average water temperature in Hapuna Beach in September is 81°F and therefore suitable for comfortable swimming. The warmest sea in Hapuna Beach in September is 85.5°F, and the coldest is 78.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Hapuna Beach

Changes water temperature in Hapuna Beach in September 2025, 2024

To get an accurate forecast for the water temperature in Hapuna Beach for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Hapuna Beach, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 180.8°F81.3°F79°F84°F
September 280.1°F81°F79°F84.4°F
September 380.2°F80.8°F78.8°F84.4°F
September 480.2°F80.8°F78.8°F84.4°F
September 5 80.4°F78.8°F84°F
September 6 80.4°F78.8°F84.2°F
September 7 80.6°F79.2°F84.6°F
September 8 80.2°F78.8°F85.5°F
September 9 80.2°F78.6°F85.3°F
September 10 80.4°F78.6°F85.3°F
September 11 80.4°F78.6°F84.9°F
September 12 80.8°F78.6°F84.7°F
September 13 81°F78.6°F84.4°F
September 14 81.1°F78.6°F84.4°F
September 15 80.8°F78.8°F84.2°F
Day 2025 2024 Min Max
September 16 81°F79°F84.4°F
September 17 81°F78.8°F84.6°F
September 18 81.1°F78.8°F84.4°F
September 19 81°F78.8°F84.6°F
September 20 81°F78.4°F84.4°F
September 21 81°F78.6°F84.4°F
September 22 80.6°F78.4°F84.6°F
September 23 80.4°F78.1°F84.4°F
September 24 80.6°F78.8°F84.7°F
September 25 80.4°F78.6°F84.6°F
September 26 80.6°F79°F84.2°F
September 27 80.6°F78.8°F84°F
September 28 80.6°F79°F83.7°F
September 29 80.6°F79.3°F83.5°F
September 30 80.6°F79.2°F83.5°F
Hapuna Beach water temp chart in September

Average water temperature in Hapuna Beach in September over a decade

20152016201720182019
84.4°F81.9°F81.9°F82.4°F83.1°F
20202021202220232024
80.4°F80.6°F81°F80.4°F80.8°F

Hapuna Beach sea state in September

Chart comparing the height of waves in Hapuna Beach in September 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.

Waves height in Hapuna Beach in September

Hapuna Beach water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in September?

Want to know where the water temperature in September is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

The nearest locations with the average water temperature in September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Kawaihae81°F78.1°F85.5°F
Mauna Kea Beach81°F78.1°F85.5°F
Spencer Beach81°F78.1°F85.5°F
Puako81°F78.1°F85.5°F
Waialea Beach81°F78.1°F85.5°F
Mauna Lani81°F78.1°F85.5°F
Mahukona80.8°F77.9°F85.3°F
Kua Bay81°F78.1°F85.5°F
Kukio81°F78.1°F85.5°F
Makalawena Beach81°F78.1°F85.5°F

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Hapuna Beach has a "Blue Flag" [1] award

Current rating: 4,0 (1 votes cast)

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Hapuna Beach is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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