August · Thailand weather
Thailand in August: Weather, What to Expect & Where to Go
Updated
August is mid-monsoon almost everywhere except the Gulf — and yet it's one of the busiest months because of European school holidays. Expect rain, but also high prices on the Andaman despite the weather.
Best region
Gulf
Samui's dry pattern continues — still the most reliable beach option.
Avoid
Andaman
Heavy rain, but high European-holiday pricing despite the weather.
Good for
Gulf islands, cultural Bangkok
August weather, region by region
Average temperatures and rainfall across Thailand's five climate regions in August. Tap the climate map on the homepage for an interactive month-by-month view.
| Region | Avg temp | Rainfall | Visit rating |
|---|---|---|---|
North Chiang Mai | 27°C | 210mm | Good |
Northeast Nakhon Ratchasima (Korat) | 28°C | 240mm | Good |
Central Bangkok | 29°C | 190mm | Good |
Andaman Phuket | 28°C | 360mm | Good |
Gulf Koh Samui | 29°C | 110mm | Great |
City spotlights
One city per region — what August actually feels like on the ground, and what to do or skip.
North
Chiang Mai
By the numbers
Chiang Mai averages 27°C — highs around 30°C, nights around 22°C. Around 210mm of rain across 17 days. Wettest month so far in the north.
Lush and dramatic. Mountains are at their greenest and most photogenic between storms.
Wet and lush. Cooking classes, café-hopping, and indoor markets are at their best. The mountains are green and dramatic between storms.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Northeast
Nakhon Ratchasima (Korat)
By the numbers
Korat averages 28°C with around 240mm of rain across 18 days. Quiet, green, and atmospheric — Khao Yai sees almost no foreign tourists.
Long weekends from Bangkok get you Khao Yai wildlife, swollen waterfalls, and empty viewpoints.
Quiet, green, and atmospheric. Khao Yai sees almost no foreign tourists this month — a long weekend from Bangkok gets you wildlife, waterfalls, and empty viewpoints.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Central
Bangkok
By the numbers
Bangkok averages 29°C with around 190mm of rain across 16 days. Flash flooding in low-lying neighbourhoods is common. Humidity 80%.
Hot, humid, and prone to flash floods. Stick to BTS-connected neighbourhoods and accept indoor afternoons.
Hot, humid, and prone to flash floods. Stick to BTS-connected neighbourhoods and accept indoor afternoons.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Andaman
Phuket
By the numbers
Phuket averages 28°C with around 360mm of rain across 23 days. Sea visibility 5–10m. Most dive operators closed. Yet prices stay high due to European holidays.
Worst value of the year — rainy and rough but charging peak-adjacent rates because of European school holidays.
Rainy and rough, with European-holiday pricing. Worst value of the year.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Gulf
Koh Samui
By the numbers
Koh Samui averages 29°C with around 110mm of rain across 9 days. Sea temperature 30°C, calm seas, peak dive visibility.
Still on the dry calendar. Hot, bright, and reliable — your best beach bet in August.
Still on the dry calendar. Hot, bright, and reliable — your best beach bet in August.
Year-round climate
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Events & festivals in August
Queen's Birthday / Mother's Day (12 August)
Bangkok lights up with portraits of HM Queen Sirikit and floral tributes. Schools and offices close — markets are quieter than usual.
Where to actually go
Ten days in August
- 3days
Bangkok
Mornings for markets, afternoons in malls. Accept the rain.
Train · 13h overnight sleeperBook on 12Go - 3days
Chiang Mai
Wet and lush. Cooking classes, café-hopping, indoor markets all at their best.
Flight · ~3h with layoverBook on 12Go - 4days
Koh Samui
Peak Gulf beach weather. The country's only reliable August sunshine.
Skip the Andaman coast in August. You'll pay European-holiday prices for monsoon weather — the worst-value combination of the year.
Sea conditions in August
Thailand has two coastlines on opposite monsoon calendars. Here's what each looks like this month for swimming, diving, and boat trips.
Andaman coast — Phuket, Krabi, Phi Phi
Wet and rough. Visibility 5–10m, most dive operators closed, beaches have strong rip currents. Ferries run when weather allows.
Gulf coast — Samui, Phangan, Tao
At peak. Sea temperature 30°C, Koh Tao visibility 25–30m, ferries on schedule, diving live-aboards running.
How crowded is Thailand in August?
European school holidays push prices up on Phuket and Krabi despite the monsoon — worst value of the year. Samui sees a noticeable bump in tourists too. Chiang Mai, Bangkok, and Isaan remain quiet.
What to pack for Thailand in August
- Compact rain jacket — used daily
- Quick-dry travel clothes only
- Waterproof shoes or sandals you don't mind soaking
- Insect repellent — peak mosquito month
- Dry bag for phone and wallet
August is the peak of the wet season in Bangkok and on the Andaman side. Don't fight it — plan museums, cooking classes, malls, and cafés for the afternoons; outdoor sightseeing for mornings.
Thailand in August — common questions
Is August a good time to visit Thailand?
Only if you're flexible. The Andaman coast is wet and overpriced (European school holidays inflate prices despite the monsoon), Bangkok is rainy, but the Gulf islands and the north are perfectly workable. Skip Phuket/Krabi, head to the Gulf or the north, and accept that big-city sightseeing will involve rain.
Is August rainy season in Thailand?
Yes — August is one of the wettest months of the year on the Andaman side (360mm in Phuket) and in Bangkok (190mm). The north sees its peak monthly rainfall too. Only the Gulf coast (Samui, Phangan, Tao) stays mostly dry.
Why is Phuket so expensive in August despite the rain?
European school holidays. Many European families travel in August regardless of weather, which keeps Phuket and Krabi hotels at peak-adjacent rates even though it's the worst beach month of the year. It's genuinely the worst value-for-money window on the Thai calendar.
How hot is Bangkok in August?
Bangkok averages 29°C with afternoon highs of 33°C and overnight lows of 26°C. Humidity stays at 80% throughout the day, with daily afternoon storms breaking the heat. Flash flooding in low-lying neighbourhoods is common after heavy storms.
Is the Gulf coast a good idea in August?
Yes — August is the tail end of Koh Samui's peak dry season. Expect reliable sun, sea temperatures of 30°C, and exceptional diving on Koh Tao with 25–30m visibility. It's the country's most reliable August beach destination.
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Isaan candle festivals, Gulf beaches, Chiang Mai
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Cheap flights, Phuket Vegetarian Festival, quiet temple visits
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