Honolulu in September
Find out everything about the water temperature in Honolulu in September. Average, minimum and maximum recorded temperatures as well as daily temperature in September for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in September
Minimum:
79.2 °F
Average:
81.0 °F
Maximum:
83.2 °F
Sea water temperature in Honolulu in September
In the city of Honolulu, the month of September is a great time for swimming. The minimum recorded temperature during this month was 79.2°F on September 14, 2021, with an average temperature being 81.0°F and a maximum temperature reaching 83.2°F on September 29, 2019.
| Date | 10 years average | 2025 | 2024 |
|---|---|---|---|
| Sep 1 | 80.7°F | 80.2°F | 80.7°F |
| Sep 2 | 80.8°F | 80.2°F | 80.8°F |
| Sep 3 | 80.9°F | 80.3°F | 81.0°F |
| Sep 4 | 80.8°F | 80.7°F | 81.0°F |
| Sep 5 | 80.9°F | 80.9°F | 81.1°F |
| Sep 6 | 80.9°F | 81.0°F | 81.1°F |
| Sep 7 | 81.0°F | 80.7°F | 81.1°F |
| Sep 8 | 81.1°F | 80.8°F | 81.1°F |
| Sep 9 | 81.1°F | 81.3°F | 81.0°F |
| Sep 10 | 81.1°F | 81.1°F | 81.2°F |
| Sep 11 | 81.2°F | 81.6°F | 81.5°F |
| Sep 12 | 81.1°F | 81.2°F | 81.7°F |
| Sep 13 | 81.0°F | 81.0°F | 81.9°F |
| Sep 14 | 81.0°F | 81.0°F | 81.7°F |
| Sep 15 | 81.0°F | 80.9°F | 81.3°F |
| Sep 16 | 81.0°F | 80.6°F | 81.1°F |
| Sep 17 | 81.0°F | 80.4°F | 81.1°F |
| Sep 18 | 81.0°F | 80.5°F | 81.0°F |
| Sep 19 | 81.0°F | 80.5°F | 81.1°F |
| Sep 20 | 80.9°F | 80.4°F | 80.8°F |
| Sep 21 | 80.9°F | 80.5°F | 80.7°F |
| Sep 22 | 80.9°F | 80.6°F | 80.7°F |
| Sep 23 | 80.9°F | 80.4°F | 80.7°F |
| Sep 24 | 80.8°F | 80.2°F | 80.7°F |
| Sep 25 | 80.9°F | 80.4°F | 80.8°F |
| Sep 26 | 80.9°F | 80.2°F | 80.7°F |
| Sep 27 | 81.1°F | 80.5°F | 81.0°F |
| Sep 28 | 81.2°F | 80.4°F | 81.0°F |
| Sep 29 | 81.1°F | 80.5°F | 81.2°F |
| Sep 30 | 81.1°F | 80.5°F | 81.1°F |
In Honolulu, the water temperature is comfortable for swimming all year round.
The warmest water in Honolulu was recorded on September 29, 2019, reaching a 83.2°F. While the coldest temperature occurred on March 2, 2019, dipping to 73.7°F. The average readings by season are 77.1°F in Winter, 77.0°F in Spring, 79.8°F in Summer, and 80.6°F in Autumn.
The average temperature in September is slightly warmer than August's average of 80.6°F. And in October, the temperature is expected to rise further, potentially reaching an average of 81.0°F.