When is the best time for diving on Koh Tao?

Roughly March to September, when seas are calm and visibility at its best. Diving runs year-round, but October to December brings wind, rain and reduced visibility.

When is the rainy season on Koh Tao?

October to December, peaking in November. Like the rest of the Gulf, Koh Tao stays largely dry through the European summer months.

Can ferries to Koh Tao be cancelled?

Yes — in the November–December monsoon, rough seas occasionally halt crossings from Chumphon and Surat Thani for a day or two. Build slack into travel plans in those months.

When can you see whale sharks at Koh Tao?

Sightings happen year-round and are never guaranteed. Many divers report clusters of sightings in the settled months around March–May and again around September–October.

Gulf of Thailand · Seasons & weather

Best time to visit Bang Saphan

Dry and calm from December to April, wet in October and November. The beach is empty in every one of those months.

Ban Krut's weather, forty kilometres south

Bang Saphan is the next bay south of Ban Krut, close enough that the two share a season. Dry from December to April, warm showers from May to September, and a proper wet spell in October and November when the north-east monsoon reaches this part of the Gulf.

The difference is in how empty it is. Mae Ram Phueng is a long, straight beach with resorts spaced far apart and almost no through traffic, so even in the peak weeks it does not feel busy. That cuts both ways: in the low season, some of the smaller places have very few guests and a short menu.

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In short

Bang Saphan seasons

December–April: dry, calm, flat sea — the main season
May–September: short heavy showers, green, very cheap
October–November: wind, swell and days of rain
Hottest and clearest water: March and April
Same weather as Ban Krut, 40 km north

The dry season, December to April

December to February is the best stretch: dry, breezy, and cool enough after dark that the fan is usually enough. The sea is flat and shallow a long way out, which makes this an easy beach for children and a dull one for anybody wanting waves.

March and April get hot and still. The compensation is the water, which is at its clearest, and the mornings, which are perfect for the coast road up towards Thong Chai mountain or down to the fishing village at Bang Pu before the heat lands.

Good to know

Planning around the weather

The beach is shallow and gentle — good for children, poor for swimmers who want depth.
Bring a scooter or a rented car: the beach, the town and the station are far apart.
In the low season, check that your resort's kitchen is open before you book.
Thong Chai mountain and the coast road are best in the early morning, March and April especially.

Rain, and what it actually means here

May to September is the green season. Showers are heavy but short, usually in the afternoon, and they leave the rice fields and coconut groves behind the beach looking their best. Room rates drop and you will often have a kilometre of sand to yourself.

October and November are different. Wind comes onshore, the sea turns brown and rough, and rain can last for days. Bang Saphan has no rainy-day industry to fall back on — no mall, no cinema, few indoor attractions — so this is the one time of year when another destination may simply suit you better.

Month by month

January	Dry, breezy, cool nights — the best month
February	Dry and calm, the sea like a lake
March	Hot and dry, clearest water of the year
April	Hottest month, Songkran mid-month, still dry
May	Hot, the first afternoon showers
June	Warm, mostly dry, green and empty
July	Warm with occasional storms
August	Short heavy showers, almost no visitors
September	Showers more frequent, sea building
October	Wettest month — onshore wind and rough sea
November	Wet early, drying out towards the end
December	Dry season returns, the beach at its best

Frequently asked questions

When is the best time to go to Bang Saphan?

December to April, and December to February in particular: dry days, cool nights and a flat, shallow sea.

When does it rain in Bang Saphan?

October and November are the wet months. May to September brings short, heavy afternoon showers that clear quickly.

Is Bang Saphan busy in high season?

Not by Thai beach standards. Mae Ram Phueng is long and the resorts are far apart, so even at Christmas it stays quiet. Thai weekends are the busiest it gets.

Is there anything to do in Bang Saphan when it rains?

Very little indoors. That is the honest answer, and it is why October and November are the months to avoid if the beach is why you are coming.

Travel guides

More guides to Bang Saphan and this stretch of the upper Gulf coast.

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Bang Saphan

Bang Saphan