Weather in Krabi in May

Shoulder season. May is shoulder season in Krabi — cheaper, quieter, and a genuine gamble. You should expect rain on 26 days of the month, which is more days wet than dry.

May ranks 11 of 12 — near the bottom of Krabi'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 26 of the month's 31 days, 8 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 84% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 9 days top 30 °C — hot spells arrive, but they break; the day barely swings — 2.5 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest May day reached 34.5 °C and the coldest night fell to 25.3 °C, and the wettest single day dropped 53 mm — roughly 22% of the month's rain in one day.

May is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest May on record still delivered 374 mm against 135 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 237 mm average is a reasonable planning figure, not a promise.

Wind is light at 6.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 84%, high enough to notice on the warm days without dominating them.

How May sits in the year

Temperatures hold steady either side: 30.9 °C in April, 29.6 here, 28.8 in June. Nothing about the timing within the month matters much. Rain has already shifted: 6 days more than April had.

Daylight in May

Krabi sits close enough to the equator that daylight barely moves all year — 12.5 hours in May, against a range of just 0.9 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 30.4 °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 Krabi versus nearby

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

So: May is a compromise. February is 29 points better and is what Krabi 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 Krabi

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