Railay Water Temperature
Updated Tue 14:55 (Asia/Bangkok)
Thailand · Forecast updated Sep 22, 2026, 14:55 UTC · refresh delayed
Current Sea Temperature
30.3°C
86.5°F
Very warm water
Valid Sep 22, 2026, 14:55 (Asia/Bangkok). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.5°C above
The typical September average is 29.8°C (85.6°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 30.0°C, versus 30.1°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 Railay, typical monthly averages range from about 29.1°C (84.4°F) in January to 31.7°C (89.1°F) in May.
Over the past 30 days, the average sea temperature in Railay has been 30.2°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Railay, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 28.8–29.3°C | 29.1°C / 84.4°F |
| February | 29.2–30.0°C | 29.6°C / 85.3°F |
| March | 29.7–30.9°C | 30.4°C / 86.7°F |
| April | 31.2–32.1°C | 31.5°C / 88.7°F |
| May | 31.1–32.6°C | 31.7°C / 89.1°F |
| June | 30.4–31.1°C | 30.7°C / 87.3°F |
| July | 30.0–30.5°C | 30.3°C / 86.5°F |
| August | 29.9–30.8°C | 30.4°C / 86.7°F |
| September | 29.6–30.1°C | 29.8°C / 85.6°F |
| October | 29.9–30.4°C | 30.3°C / 86.5°F |
| November | 29.1–30.2°C | 29.8°C / 85.6°F |
| December | 29.1–29.6°C | 29.4°C / 84.9°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (8.04, 98.79). 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.
Railay in January
Typical January water temperature near Railay is 29.1°C (84.4°F), with yearly monthly means from 28.8–29.3°C.
Railay in February
Typical February water temperature near Railay is 29.6°C (85.3°F), with yearly monthly means from 29.2–30.0°C.
Railay in March
Typical March water temperature near Railay is 30.4°C (86.7°F), with yearly monthly means from 29.7–30.9°C.
Railay in April
Typical April water temperature near Railay is 31.5°C (88.7°F), with yearly monthly means from 31.2–32.1°C.
Railay in May
Typical May water temperature near Railay is 31.7°C (89.1°F), with yearly monthly means from 31.1–32.6°C.
Railay in June
Typical June water temperature near Railay is 30.7°C (87.3°F), with yearly monthly means from 30.4–31.1°C.
Railay in July
Typical July water temperature near Railay is 30.3°C (86.5°F), with yearly monthly means from 30.0–30.5°C.
Railay in August
Typical August water temperature near Railay is 30.4°C (86.7°F), with yearly monthly means from 29.9–30.8°C.
Railay in September
Typical September water temperature near Railay is 29.8°C (85.6°F), with yearly monthly means from 29.6–30.1°C.
Railay in October
Typical October water temperature near Railay is 30.3°C (86.5°F), with yearly monthly means from 29.9–30.4°C.
Railay in November
Typical November water temperature near Railay is 29.8°C (85.6°F), with yearly monthly means from 29.1–30.2°C.
Railay in December
Typical December water temperature near Railay is 29.4°C (84.9°F), with yearly monthly means from 29.1–29.6°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 | 30.7°C / 87.2°F | 31.4°C / 88.5°F |
| July | 29.9°C / 85.8°F | 30.5°C / 86.9°F | 31.3°C / 88.3°F |
| August | 30.0°C / 86.0°F | 30.5°C / 86.9°F | 31.2°C / 88.2°F |
| September | 29.6°C / 85.3°F | 30.2°C / 86.4°F | 30.7°C / 87.3°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2735 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Railay
Limestone peninsula with sheltered bays and reef around the cliffs.
- Area
- Krabi
Railay Water Temperature: Common Questions
What is the water temperature in Railay today?
The current sea surface temperature near Railay is 30.3°C (86.5°F). Over the last 30 days, the average has been 30.2°C.
When is the water warmest in Railay?
The water is typically warmest in May, at around 31.7°C (89.1°F) in the 2023–2025 historical baseline.
When is the water coldest in Railay?
The water is typically coldest in January, at around 29.1°C (84.4°F) in the same historical baseline.
Can you swim in Railay 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 Railay.
View Snorkel Forecast →