Hua Hin Flood Risk: How Thailand’s Coasts Compare

This article is general information drawn from public sources, not investment advice. For a decision about a specific property, take independent professional advice.

When a buyer from Bangkok asks us whether a house by the sea will still be dry in thirty years, they are usually thinking of their own city. Bangkok lies less than two metres above sea level and is still sinking, and the 2011 flood that closed its northern industrial estates is a memory nobody in the capital has lost; in 2026 the water was back. It is a fair question to put to any coast, and Hua Hin flood risk is the version of it we hear most often. We answer it here from the record rather than from sales copy: what floods each of Thailand’s main coastal property markets, and what the projections for 2050 and 2100 say.

Our reading of the record is that Hua Hin’s risk is real but smaller than Bangkok’s, and of a different kind. The town is not on a sinking delta, and it lies outside the Chao Phraya basin whose run-off flooded the capital in 2011. What it does get is heavy rain in late-year storms, which has put housing estates inland under 50 to 80 cm of water, and a shore where storms have cut back the beach and, at least once, pushed seawater into the streets. Koh Samui’s hillsides sit far above any projected sea level, but steep ground brings a risk of its own. Pattaya mostly floods from the sky, not from the sea; Phuket has both to reckon with.

How do Thailand’s coasts compare on flood risk?

The last column is our own reading of the sources cited below, not an official rating, and a single street or slope can matter more than the town it is in.

Coast	What drives the risk	What the record shows	Our reading
Bangkok and the upper Gulf	Land under 2 m and sinking; river run-off; high tides	2011 flood: THB 1.43 trillion in damage nationwide; six major floods since 1980	High, and rising
Phuket	Heavy monsoon rain on steep, built-up hills; land lowered since the 2004 earthquake	Karon landslides, August 2024: 13 dead; one of two areas where the World Bank finds coastal flood damage concentrated today	High for rain and slopes
Pattaya	Intense storms on old drainage	Sukhumvit Road under 60 to 80 cm of water, October 2024	Moderate to high, mostly street flooding
Koh Samui	October to December monsoon rain; landslides on steep ground	Disaster zone after floods, December 2024; a fatal hillside landslide the same month	Moderate, and site by site
Hua Hin and Cha-Am	Late-year storms on low ground; erosion and storm waves on the beach	Estates on Soi Hua Hin 102 under 50 to 80 cm, November 2017; seawater in the streets, December 2011; beach cut back 25 m by Typhoon Gay, 1989	Low to moderate; check the soi and the beachfront

Why is Bangkok sinking, and what does that mean by 2050?

Bangkok stands on the soft clay of the Chao Phraya delta. The World Bank’s 2025 climate report for Thailand describes the capital as "less than 2 meters above sea level" and sinking "because of excessive underground water use and the weight of large-scale high-rise development" (World Bank, Thailand CCDR). Decades of groundwater pumping compacted the clay: levelling surveys recorded up to 108 cm of accumulated subsidence in parts of Bang Kapi between 1978 and 2007, and satellite radar measured 10 to 30 mm a year across the Bangkok area between 2005 and 2010 (Pumpuang and Aobpaet, 2024). Limits on pumping have slowed the sinking, but the World Bank notes that "there remains substantial uncertainty around future outcomes".

The city floods from three directions at once. In 2018 Bangkok’s then governor, Aswin Kwanmuang, named them: run-off from the north, high sea levels and heavy rain (Thai PBS World). In 2011 all three arrived together. The World Bank classes that flood as a 1-in-50-year event, puts its damage nationwide at 12.6% of GDP, THB 1.43 trillion or about USD 46.5 billion, and estimates a 50% chance that a flood of that size happens again by 2050.

On 27 October 2026 the Department of Disaster Prevention and Mitigation counted 327,004 households affected in 20 provinces and eastern Bangkok, 168,203 of them in the capital, down from 1.18 million on 1 October, when Chon Buri, Pattaya’s province, had 118,723 (The Nation, The Nation). Phetchaburi, which includes Cha-Am, reached 2,726 households on 17 October, in three districts, none of them Cha-Am (The Nation). Prachuap Khiri Khan, Hua Hin’s province, was in none of these counts; on 29 October rain flooded homes in Bang Saphan and closed two sections of Phetkasem Road in Thap Sakae, both in its south (Naewna, The Nation), and a local report under a "Hua Hin floods" headline listed no flooded road in Hua Hin district (Hua Hin Localplus).

The long view is harsher. A 2019 study using a corrected elevation model estimated that even with deep cuts in emissions, high tide by 2100 could stand above land that is home today to about 17% of Thailand’s people, and its maps single out Bangkok (Kulp and Strauss, Nature Communications, 2019). It leaves out sea walls and dykes, which protect much of the city, so it measures exposure rather than forecasting a flood. The World Bank’s report cites a 2019 study as indicating that parts of Bangkok "could be unviable by 2050".

How much will the sea rise, and what does that mean for Hua Hin?

The Intergovernmental Panel on Climate Change finds that global sea level rose by about 20 cm between 1901 and 2018, at under 2 mm a year until 2006 and 3.7 mm after, and puts the likely rise by 2100 at 0.28 to 0.55 m above the 1995 to 2014 average if emissions are cut very sharply, and 0.63 to 1.01 m if they stay very high (IPCC AR6, Summary for Policymakers). For Thailand, the World Bank works with roughly 0.2 m by 2050 and a median of 0.6 to 0.7 m by 2100. It expects the 2050 rise to have "only limited impacts", but storm-surge damage to grow by then in most places the sea already floods. The Gulf is rising faster than the global average, the study that measured it found: at Ko Lak in Prachuap Khiri Khan, the nearest long tide record to Hua Hin, the sea rose about 3 mm a year from 1940 to 2004 once land movement is removed (Trisirisatayawong and others, 2011).

What matters is the ground the rising sea meets. On a delta that is sinking, every centimetre of sea-level rise arrives on land that has already dropped. Hua Hin sits at the foot of hills that geologists map as granite, around 200 million years old (Yuhara and others, 2011), and we found no published measurement of significant land subsidence in Hua Hin or Cha-Am; the subsidence studies concentrate on Bangkok and the delta provinces around it. That is not proof that the ground never moves: the Ko Lak study warns of "high rates" of sinking along the Gulf since the 2004 earthquake, and the town centre and the beach condominiums stand on sand and coastal sediment below the granite, not on the rock itself. But it puts Hua Hin in a different category from the capital.

What does flooding look like in Hua Hin and Cha-Am today?

Rain on the streets

Mostly rain, not the sea. About 250 mm of Hua Hin’s rain, more than a quarter of the year’s, falls in October (WMO climate normals, NOAA archive), and an October downpour can beat the street drains for a few hours. On the morning of 9 October 2024 heavy rain left 30 to 40 cm of water at the Cha-Am intersection on Phetkasem Road and 20 to 30 cm in the streets near Cha-Am beach (Pattaya Mail). Our companion piece on the best climate in Thailand covers when the rain falls.

Erosion on the beachfront

The beachfront is where the sea matters, and there the risk comes in a storm rather than a slow rise: erosion, and, rarely, waves that carry the sea inland. In late December 2011 waves of two to four metres struck the district’s coast and Pattaya Mail reported seawater 10 to 30 cm deep in houses and roads in Hua Hin municipality (Pattaya Mail). A Chulalongkorn University study of satellite images found that Typhoon Gay in 1989 cut the Hua Hin shoreline back by 25.39 m and Typhoon Linda in 1997 by 10.36 m, worst between the airport and the pier, and noted that strong northeast monsoon storms strike once or twice a year (Chairat, 2008). The beach partly built back up after both typhoons, but the study’s long-term measurement still found about 16.6 m of erosion between 1989 and 2006. If you are looking at beachfront property in Hua Hin, ask how far the building stands from the high-water line, whether the beach in front of it has a sea wall, and how it came through the last big storm.

Inland estates

Away from the shore, distance from the sea is not distance from flooding. In November 2017 rain brought by Storm Kirogi fell on Hua Hin from a Monday night until noon the next day: the main roads into the town centre went under water, housing estates on Soi Hua Hin 102, which runs inland from Phetkasem Road, stood in 50 to 80 cm, and trains stopped when 400 m of track between Khao Tao and Wang Pong lay under 30 cm (The Nation). Estates in the countryside west of town, such as the golf estates around Black Mountain, lie kilometres from the sea, so ask the neighbours and the estate’s management about the flood history of the soi itself.

Is Koh Samui’s high ground really safer?

From the sea, yes. A villa on a hillside tens of metres above the water is out of reach of any rise the IPCC projects for this century, including the low-confidence case of close to 2 m by 2100 that it says cannot be ruled out. Samui’s risk is rain on steep ground. The island averages 1,994 mm of rain a year, and half of it falls in October, November and December. In December 2024 Surat Thani declared Koh Samui and seven other districts disaster zones after severe flooding (Pattaya Mail), and on 15 December two workers died when a landslide buried their dormitory at a hillside villa construction site on the island, a day after the Department of Mineral Resources had warned of landslide risk to buildings on steep slopes (Khaosod English). When Pabuk came ashore in January 2019, the first tropical storm to make landfall in southern Thailand since Linda in 1997, waves of up to three metres ran further inland on Samui than usual, and flights and ferries to the island stopped (Al Jazeera).

So the questions to ask on Samui are about engineering rather than height: the retaining walls, the drainage around the house, the access road in a November storm, and who assessed the slope before the villa was built. Put them to any villa you view, including the three in our comparison of Koh Samui sea-view villas at around 20M THB.

Phuket and Pattaya: is the problem the sea or the rain?

Phuket: rain on steep hills, and the sea

Phuket’s town station averages 2,272 mm of rain a year, most of it between May and October, and much of it falls on steep, heavily built-up hills. In August 2024, after a night of heavy rain, landslides in Karon killed at least 13 people, and Chalong, Karon and Rawai were declared disaster zones (TravelMole). The sea is a factor there as well. The World Bank finds that today’s coastal flood damage in Thailand is concentrated around the Bay of Bangkok and in Phuket, with limited damage elsewhere on the coastline, and after the 2004 Sumatra–Andaman earthquake the island itself sank by about 10 cm over 17 years, so that relative sea level there had risen by up to 16 cm by the end of 2020 (Naeije and others, Remote Sensing, 2022). We found no comparable measurement for Hua Hin.

Pattaya: old drainage

Pattaya’s station records 1,106 mm of rain a year, not far above Hua Hin, yet its streets fill when a storm stalls over it. On 6 October 2024 Sukhumvit Road by the Sukhumvit 75 pumping station stood under 60 to 80 cm of water for about 400 m, impassable to all vehicles; by 7.23 pm both lanes of Sukhumvit Road were passable again (Pattaya Mail). On 26 September 2026 heavy rain and high tides overflowed the Banglamung Canal in Pattaya’s district and flooded about 185 homes (Pattaya Mail): a drainage problem, serious for the homes it reached, but not a sinking city.

What should you check before buying on any Thai coast?

Start with the ground under the house. Ask the seller, or the juristic person if it is a condominium, how the plot, the soi and the access road behaved in the last two rainy seasons, look at the level of the ground floor against the road, and walk the drains around the building. Do this alongside the title deed and land office checks, which our guides to buying land in Hua Hin and buying a villa as a foreigner take you through.

On the record, Hua Hin and Cha-Am carry far less flood risk than Bangkok, and less than Phuket, because they are not on a sinking delta and do not sit at the bottom of a great river basin. Less is not none, though, whatever sales copy promises: the beachfront and the inland sois that have flooded before are where to look hardest. Koh Samui’s hills are out of the sea’s reach and within the rain’s. If you are planning a move rather than a holiday home, our guide to retirement property in Hua Hin covers the rest of the decision.

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Ask about the ground before the view

Browse what we list around Hua Hin and on Koh Samui, and ask us about a property’s street, drainage and access road before you view it. For a structural or slope assessment, use an independent engineer.