Thailand weather in August
August sits at the absolute peak of Thailand’s wet season. Daytime highs hover in the high-20 to low-30 °C / high-70 to mid-80 °F range, but humidity pushes the “feels-like” well above that. Expect daily downpours, swollen rivers and the occasional flooded street—yet also rock-bottom hotel rates and uncrowded sights.
1 | Quick-Look Table
| Region | Avg High °C | Rainfall (mm) | Typical Conditions | Travel Notes |
|---|---|---|---|---|
| Bangkok & Central | 32 – 33 | ≈ 250 | Daily storms, flash floods | Bring quick-dry sandals; traffic jams spike. |
| Chiang Mai & North | 30 – 32 | ≈ 200 | 20 + rain-days | Rice terraces emerald; trails muddy. |
| Isan / Mekong | 31 – 32 | 220 – 270 | High rivers, scattered floods | Landslide risk on hill roads. |
| Gulf Islands (Samui / Phangan) | 31 | ≈ 120 | Brief squalls, long sunny spells | Best beach weather this month. |
| Koh Chang & East | 30 – 31 | 400 + | Torrential rain, landslides | Many boat trips cancel. |
| Phuket / Krabi (Andaman) | 29 – 31 | 320 – 380 | Rough seas, red-flag beaches | Surf season; waterfalls roar. |
2 | August Highlights
- Rain Rhythm — Downpours hit almost daily, often mid-afternoon; mornings can start bright.
- Humidity — Peaks above 80 %; pack moisture-wicking fabrics.
- Sea State — Andaman waves 1–3 m; Gulf comparatively calm near Samui.
- Crowds & Cost — One of the quietest months; luxury resorts slash rates 40 % +.
3 | Packing Essentials
- Lightweight waterproof jacket & travel umbrella
- Quick-dry shoes / sandals for flooded streets
- Dry-bag for electronics
- Spare socks & breathable clothing (humidity is relentless)
4 | Frequently Asked Questions (FAQ)
Q 1. Does it rain the entire day in Thailand during August?
No. Rain is heavy but usually comes in 30- to 90-minute bursts, often mid-afternoon or overnight. Plan outdoor activities for early morning and keep afternoons flexible.
Q 2. Which Thai beach has the best weather in August?
The Koh Samui – Koh Phangan – Koh Tao trio in the Gulf sits in a rain shadow, averaging roughly half the rainfall of Phuket. Expect sunny mornings, the odd squall, and generally calm seas.
Q 3. Is August a cheap month to visit Thailand?
Yes. August is low season; five-star resorts can be 40 % cheaper than in December–January, and domestic flight fares often drop.
Q 4. Where in Indochina is drier than Thailand in August?
Central Vietnam (Hoi An, Da Nang, Quy Nhon) remains in its long dry spell, and Luang Prabang, Laos sees shorter, lighter showers than Bangkok. Both options stay within Tonkin Voyage Travel’s Vietnam–Laos–Cambodia network.
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