Interactive map
Thailand · Krabi
Railay Beach
Sea
30.0°C86.0°F
Air
–
UV
–
Bathtub
Above ⁦28°C⁩

Last updated ·

Today, September 13, the sea temperature at Railay Beach is 30 °C (86 °F). That is 0.5 °C warmer than the usual 29.5 °C in September. Comfortable for swimming year-round.

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Climate · monthly averages

Sea temperature by month

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.

Warmest in May (30.8°C). Coldest in January (28.5°C). Comfortable for swimming year-round.

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.
MonthSea · MinSea · AvgSea · MaxAir · MinAir · AvgAir · Max
January28.4°C28.5°C28.7°C25.7°C27.1°C29.0°C
February28.8°C29.1°C29.5°C26.2°C27.7°C29.3°C
March29.3°C29.8°C30.0°C27.0°C28.3°C29.5°C
April30.4°C30.7°C31.3°C27.7°C28.5°C29.2°C
May30.5°C30.8°C31.4°C27.8°C28.6°C29.0°C
June29.8°C30.2°C30.7°C27.6°C28.3°C28.7°C
July29.8°C29.9°C30.1°C27.6°C28.1°C28.4°C
August29.5°C29.9°C30.3°C27.3°C27.8°C28.2°C
September29.4°C29.5°C29.7°C27.0°C27.5°C27.9°C
October29.1°C29.6°C30.0°C26.6°C27.3°C27.8°C
November29.1°C29.4°C29.8°C26.1°C26.9°C27.5°C
December28.7°C28.8°C29.0°C25.6°C26.9°C28.4°C

About Railay Beach

Railay is a small Andaman peninsula between Krabi town and Ao Nang, walled off from the mainland by limestone karst cliffs that rise 150 to 300 metres and force every arrival onto a long-tail boat across the bay. West Railay curves as a turquoise, sunset-facing crescent of fine sand, while Phra Nang to the south sits framed by overhanging cliffs and the Princess Cave shrine. The sea holds 28 to 30 °C82 to 86 °F year-round, with Krabi International airport about 45 minutes away by car and boat.

Frequently asked questions

Today, September 13, the sea at Railay Beach is 30 °C (86 °F)86 °F (30 °C) – bathtub-warm. The usual September average is 29.5 °C85 °F.

No single number works for everyone, so the scale on this page is only a guide to how the water feels: below 13 °C55 °F icy, 13–18 °C55–64 °F cold, 18–23 °C64–73 °F refreshing, 23–28 °C73–82 °F pleasantly warm and above 28 °C82 °F like a bath. Right now the sea at Railay Beach is 30 °C86 °F.

Yes – the sea at Railay Beach (Krabi, Thailand) stays swimmable all year. January is the coolest month, averaging 28.5 °C83 °F – bathtub-warm; the warmest is May at 30.8 °C87 °F.

In May, at 30.8 °C87 °F on average. The coolest month is January at 28.5 °C83 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.