World sea water temperatures

Water temperature in Kailua Kona (HI) in September

Is it warm enough to swim in Kailua Kona in September? Average water temperature in Kailua Kona in September is 81°F and therefore suitable for comfortable swimming. The warmest sea in Kailua Kona in September is 85.3°F, and the coldest is 78.1°F. Average high air temperature in Kailua Kona in September is 87°F, and average low temperature is 75°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Kailua Kona

Changes water temperature in Kailua Kona in September 2025, 2024

To get an accurate forecast for the water temperature in Kailua Kona for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Kailua Kona, 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 180.6°F81°F79°F84°F
September 280.2°F81.5°F79°F84.4°F
September 380.2°F81.9°F79°F84.4°F
September 480.4°F81.3°F78.8°F84.2°F
September 580.8°F81°F78.8°F84°F
September 680.8°F81°F79°F84.2°F
September 781°F81.3°F79°F84.6°F
September 880.8°F81°F79°F85.3°F
September 981°F80.8°F78.8°F85.1°F
September 1081°F80.8°F78.8°F84.9°F
September 1181.1°F81.1°F78.8°F84.6°F
September 1281.1°F81.1°F78.6°F84.4°F
September 1381°F81.1°F78.8°F84.2°F
September 1481.1°F81.1°F78.8°F84°F
September 1581.1°F81.1°F78.8°F84.2°F
Day 2025 2024 Min Max
September 1681°F81.5°F79°F84.4°F
September 1781°F81.5°F79°F84.6°F
September 1881°F81.3°F79°F84.4°F
September 1980.8°F81.3°F79°F84.7°F
September 2081.3°F81.1°F78.4°F84.7°F
September 2181°F81.3°F78.8°F84.7°F
September 2281°F81°F78.4°F84.9°F
September 2380.8°F81°F78.1°F84.7°F
September 2480.8°F81°F78.8°F84.7°F
September 2581°F81.3°F78.6°F84.6°F
September 2681.1°F81.1°F78.8°F84.4°F
September 2781°F81.3°F78.6°F84.2°F
September 2881.3°F81.3°F78.8°F84°F
September 2981.3°F81°F79.3°F83.3°F
September 3081.1°F80.8°F79.2°F83.5°F
Kailua Kona water temp chart in September

Average water temperature in Kailua Kona in September over a decade

20162017201820192020
82.2°F82°F82.4°F83.3°F80.6°F
20212022202320242025
80.8°F81.1°F80.6°F81.1°F

Kailua Kona sea state in September

Chart comparing the height of waves in Kailua Kona 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 Kailua Kona in September

Weather and climate in Kailua Kona in September

This data display average monthly climate indicators in Kailua Kona in September based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature87°F
  • Average LOW temperature75°F
  • Average rainfall20mm/0.8''

Kailua Kona 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
Magic Sands81°F78.1°F85.3°F
Kahaluu-Keauhou81°F78.1°F85.1°F
Manini Beach81°F78.1°F85.1°F
Kua Bay81°F78.1°F85.5°F
Kukio81°F78.1°F85.5°F
Makalawena Beach81°F78.1°F85.5°F
Kealakekua Bay81°F78.1°F85.1°F
Honaunau Bay81°F78.1°F85.1°F
Two Step Beach81°F78.1°F85.1°F
Hookena Beach81°F78.1°F84.9°F

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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 Kailua Kona 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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