Weather in Surat Thani in January

Shoulder season. January is shoulder season in Surat Thani — cheaper, quieter, and a genuine gamble. The heat itself is manageable at 29.2 °C, but 85% humidity is what you will actually feel.

January ranks 2 of 12 in Surat Thani. Only February scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 12 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Natural fibres and a second shirt for the day. At 85% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 6 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest January day reached 32.2 °C and the coldest night fell to 19.6 °C, and the wettest single day dropped 104 mm — roughly 85% of the month's rain in one day.

This is the volatile part. January rainfall has ranged from 9 mm to 602 mm across the twenty years measured — a 593 mm spread around an average of 123 mm. The average is real but almost no individual January looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 6.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 85% is the real story though — it is the number that decides how the day feels, not the 29.2 °C.

How January sits in the year

Temperatures hold steady either side: 28.9 °C in December, 29.2 here, 30.4 in February. Nothing about the timing within the month matters much. Rain is the thing that moves: February brings 7 days less of it, so pushing the dates later buys drier weather.

Daylight in January

Surat Thani sits close enough to the equator that daylight barely moves all year — 11.6 hours in January, against a range of just 1.1 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

An inland climate

Despite being inland, the year stays fairly even: 9.9 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself. January is the value pick for Surat Thani: it scores within 11 points of February without carrying February's prices.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

January in Surat Thani versus nearby

If Surat Thani is one option among several, the nearby comparison is worth making. Krabi is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Hat Yai is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: January works, with February the better month by 11 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Surat Thani

See all twelve months in Surat Thani, or where else to go in January.