Weather in Hat Yai in May

A hard month. May asks something of you. Go in knowing what. You should expect rain on 27 days of the month, which is more days wet than dry.

May ranks 12 of 12 — near the bottom of Hat Yai's year. February is the month that works, and the swing between the two is 32 points, which is a different holiday rather than a slightly better one.

Rain on 27 of the month's 31 days, 4 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 83% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 22 days top 30 °C, making the heat continuous rather than occasional; the day barely swings — 4.5 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest May day reached 35.8 °C and the coldest night fell to 24.4 °C, and the wettest single day dropped 33 mm — roughly 21% of the month's rain in one day.

May is one of the reliable ones — rainfall has stayed between 86 mm and 211 mm across all twenty years, a narrow enough band that the 155 mm average is something you can plan against rather than merely quote.

Wind is light at 6.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 83%, high enough to notice on the warm days without dominating them.

How May sits in the year

Temperatures hold steady either side: 31 °C in April, 30.7 here, 30.1 in June. Nothing about the timing within the month matters much. Rain has already shifted: 8 days more than April had.

Daylight in May

Hat Yai sits close enough to the equator that daylight barely moves all year — 12.4 hours in May, against a range of just 0.8 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 30.6 °C in May — warm enough that the water offers no relief from the heat. This is the warmest the water gets all year.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

May in Hat Yai versus nearby

If Hat Yai is one option among several, the nearby comparison is worth making. Kota Kuala Muda is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Krabi is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: May is a compromise. February is 32 points better and is what Hat Yai is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Hat Yai

See all twelve months in Hat Yai, or where else to go in May.