In September warmest sea in Borneo is usually observed in the following locations: Kota Kinabalu, Bandar Seri Begawan, Kuala Belait.
Table below shows the average sea water temperature for marine resorts of Borneo in September for the last three years.
| Place name | September 2026 | September 2025 | September 2024 |
|---|---|---|---|
| Kota Kinabalu | 87.8°F | 85.3°F | 86.0°F |
| Bandar Seri Begawan | 87.7°F | 85.3°F | 86.2°F |
| Kuala Belait | 87.6°F | 85.2°F | 86.1°F |
| Sandakan | 87.5°F | 85.7°F | 86.4°F |
| Buntulu | 87.5°F | 85.4°F | 86.2°F |
| Seria | 87.3°F | 85.2°F | 86.2°F |
Charts below show average sea water temperature for Borneo resorts with the warmest sea in September.
You can also check other months of the year to see sea temperature of Borneo resorts at that time.
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