Thailand weather in May
May marks the onset of the southwest monsoon. Showers ramp up country-wide and temperatures ease slightly into the low-30s °C (high-80s °F). Expect short, intense downpours—often late afternoon—punctuated by bright, steamy mornings. Crowd levels dip, hotel deals appear, and waterfalls roar back to life.
1 | Quick-Look Table
| Region | Avg High °C | Rainfall (mm) | Typical Conditions | Travel Notes |
|---|---|---|---|---|
| Bangkok & Central | 33 – 34 | 120 – 170 | Humid; frequent p.m. storms | Plan museums midday; guarantee A/C rooms. |
| Chiang Mai & North | 32 – 34 | 120 – 180 | Showers clear lingering haze | Trails muddy; waterfalls spectacular. |
| Isan / Mekong | 33 – 35 | 120 – 160 | Stormy afternoons | Evenings on the river feel cooler. |
| Gulf (Samui / Phangan / Tao) | 31 – 33 | 80 – 120 | Best beach window | Calmer seas; showers brief then sunshine. |
| Koh Chang & East | 31 – 32 | 250 – 350 | Rains most days | Light rain many afternoons; visibility drops for diving. |
| Phuket / Krabi (Andaman) | 31 – 33 | 250 – 320 | Monsoon begins; choppy seas | Red-flag beaches at times; some boat trips cancel. |
2 | May Highlights
- Cooling trend — Temperatures dip a notch from April, but humidity rises.
- Rain pattern — 30–90 minute downpours, mainly late day; mornings often bright.
- Best beaches — Gulf side (Samui–Phangan–Tao) and mainland Gulf spots such as Hua Hin see the steadiest sunshine; Andaman turns unsettled.
- Nature at its best — Waterfalls across the North and Central Highlands surge back to life.
- Fewer crowds — Shoulder-season rates and easier last-minute availability.
3 | Packing Essentials
- Light rain jacket or travel umbrella; quick-dry clothing
- Sandals/shoes with grip; dry-bag for phone/camera
- Electrolyte tablets; breathable sunhat and sunscreen
- Sea-sickness tablets if attempting Andaman boat trips
4 | Frequently Asked Questions (FAQ)
Q 1. Is May a good month to visit Thailand for weather?
It’s the start of the monsoon, but still rewarding: mornings are often sunny, showers are short, prices are lower, and waterfalls are superb. Just plan flexible afternoons and expect humidity.
Q 2. Which beaches in Thailand are best in May?
The Gulf of Thailand leads: Koh Samui, Koh Phangan, Koh Tao and mainland Hua Hin usually see calmer seas and shorter showers. The Andaman coast (Phuket, Krabi) begins its wet, choppy period.
Q 3. Does it rain all day in Thailand during May?
Rarely. Typical May rain arrives as 30–90 minute downpours—often late afternoon—followed by clearing skies. Build indoor options into your schedule.
Q 4. Is May a good time for waterfalls and jungle scenery in Thailand?
Yes. Early-wet-season showers refill rivers and make waterfalls spectacular, especially around Chiang Mai, Chiang Rai and Kanchanaburi. Trails can be muddy—wear proper shoes.
Q 5. Are Phuket and Krabi calm in May?
No. May is the beginning of the Andaman monsoon: seas turn choppy, red-flag days are common and some speedboat tours cancel. For steadier conditions, choose the Gulf side.
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