Derawan Water Temperature
Updated Sat 14:40 (Asia/Makassar)
Indonesia · Forecast updated Sep 26, 2026, 14:40 UTC
Current Sea Temperature
30.3°C
86.5°F
Very warm water
Valid Sep 26, 2026, 14:40 (Asia/Makassar). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.6°C above
The typical September average is 29.7°C (85.5°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 30.1°C, versus 29.9°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions or replace the snorkel forecast.
Typical Sea Temperature Over the Year
In the historical baseline for Derawan, typical monthly averages range from about 29.1°C (84.4°F) in February to 30.3°C (86.5°F) in May.
Over the past 30 days, the average sea temperature in Derawan has been 29.6°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Derawan, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 29.1–29.5°C | 29.3°C / 84.7°F |
| February | 29.0–29.2°C | 29.1°C / 84.4°F |
| March | 29.2–29.6°C | 29.4°C / 84.9°F |
| April | 29.9–30.1°C | 30.0°C / 86.0°F |
| May | 30.2–30.5°C | 30.3°C / 86.5°F |
| June | 29.7–30.1°C | 30.0°C / 86.0°F |
| July | 29.4–29.6°C | 29.5°C / 85.1°F |
| August | 29.5–29.9°C | 29.7°C / 85.5°F |
| September | 29.4–29.8°C | 29.7°C / 85.5°F |
| October | 30.1–30.3°C | 30.2°C / 86.4°F |
| November | 30.1–30.4°C | 30.3°C / 86.5°F |
| December | 29.8–29.8°C | 29.8°C / 85.6°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (2.29, 118.21). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Water temperature by month
Each month uses the 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Derawan in January
Typical January water temperature near Derawan is 29.3°C (84.7°F), with yearly monthly means from 29.1–29.5°C.
Derawan in February
Typical February water temperature near Derawan is 29.1°C (84.4°F), with yearly monthly means from 29.0–29.2°C.
Derawan in March
Typical March water temperature near Derawan is 29.4°C (84.9°F), with yearly monthly means from 29.2–29.6°C.
Derawan in April
Typical April water temperature near Derawan is 30.0°C (86.0°F), with yearly monthly means from 29.9–30.1°C.
Derawan in May
Typical May water temperature near Derawan is 30.3°C (86.5°F), with yearly monthly means from 30.2–30.5°C.
Derawan in June
Typical June water temperature near Derawan is 30.0°C (86.0°F), with yearly monthly means from 29.7–30.1°C.
Derawan in July
Typical July water temperature near Derawan is 29.5°C (85.1°F), with yearly monthly means from 29.4–29.6°C.
Derawan in August
Typical August water temperature near Derawan is 29.7°C (85.5°F), with yearly monthly means from 29.5–29.9°C.
Derawan in September
Typical September water temperature near Derawan is 29.7°C (85.5°F), with yearly monthly means from 29.4–29.8°C.
Derawan in October
Typical October water temperature near Derawan is 30.2°C (86.4°F), with yearly monthly means from 30.1–30.3°C.
Derawan in November
Typical November water temperature near Derawan is 30.3°C (86.5°F), with yearly monthly means from 30.1–30.4°C.
Derawan in December
Typical December water temperature near Derawan is 29.8°C (85.6°F), with yearly monthly means from 29.8–29.8°C.
Forecast archive (growing)
These values come from hourly forecasts SnorkelForecast has stored. They cover only months with records and do not replace the historical baseline.
| Month | Min | Average | Max |
|---|---|---|---|
| June | 29.7°C / 85.5°F | 30.1°C / 86.2°F | 30.6°C / 87.1°F |
| July | 29.1°C / 84.4°F | 29.6°C / 85.2°F | 30.2°C / 86.4°F |
| August | 28.3°C / 82.9°F | 29.3°C / 84.8°F | 30.4°C / 86.7°F |
| September | 28.7°C / 83.7°F | 29.8°C / 85.6°F | 30.9°C / 87.6°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2831 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Derawan
Borneo archipelago with turtles, mantas and a stingless-jellyfish lake.
- Area
- East Kalimantan
Derawan Water Temperature: Common Questions
What is the water temperature in Derawan today?
The current sea surface temperature near Derawan is 30.3°C (86.5°F). Over the last 30 days, the average has been 29.6°C.
When is the water warmest in Derawan?
The water is typically warmest in May, at around 30.3°C (86.5°F) in the 2023–2025 historical baseline.
When is the water coldest in Derawan?
The water is typically coldest in February, at around 29.1°C (84.4°F) in the same historical baseline.
Can you swim in Derawan today?
At 30.3°C, the water is usually comfortable for swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Derawan.
View Snorkel Forecast →