Thailand 
In numbers.
20m
Height
OpenStreetMap
0.40m³/s
Average flow
estimate
Jul–Oct
Best months
79kW
Water power
estimate
The water at Than Sawan waterfall, month by month
It roars from August to September.
The fullest months: from August to September. The thinnest: from November to April.
- 0.1 m³/sJan
- 0.1 m³/sFeb
- 0.1 m³/sMar
- 0.2 m³/sApr
- 0.6 m³/sMay
- 0.6 m³/sJun
- 0.8 m³/sJul
- 1.2 m³/sAug
- 1.2 m³/sSep
- 0.7 m³/sOct
- 0.3 m³/sNov
- 0.1 m³/sDec
From about 0.08 m³/s in the lowest month to 1.2 m³/s in the highest. Best months to go, with plenty of water and pleasant days: from July to October.
Estimate: the timing comes from rain, snowmelt and evaporation (NASA POWER, 1991–2020); the amounts from the river model of HydroATLAS (WaterGAP, 1971–2000). Dams upstream can change the real flow.
Waterfall in Phayao province, Thailand
Than Sawan waterfall is a waterfall in Thailand. The water falls 20 m over a front 40 m wide.
Getting there.
- Chiang Muannearest town · 14 km in a straight line
- Parking 340 m awaynearest car park in OpenStreetMap, straight line
- Nan Airport (NNT)nearest airport with scheduled flights · 64 km in a straight lineCar hire at NNT airport (Nan Airport)Discover Cars · Affiliate link↗
- From July to Octoberbest months to go (estimate)
Plan your visit
Stay, explore and get there
Some links above are affiliate links: if you book through them we may earn a commission, at no extra cost to you. It never changes what the data on this page says.
How big is it?
How big it really is.
Height of the drop as mapped in OpenStreetMap (© OpenStreetMap contributors). Buildings and the person are drawn at the same scale.
79 kW
About 0.40 m³/s falling 20 m: the power of the water as it drops.
- enough to power about 20 homes, if it were all turned into electricity
Power of falling water = density × gravity × flow × height. Average flow and height as shown above; an estimate.
Seen from the sky.
8 × 8 km of cloud-free satellite image, with what OpenStreetMap knows around the falls.
N
2 km
Sentinel-2 cloudless 2016 (EOX, CC BY 4.0), 8 × 8 km, north up. Points © OpenStreetMap contributors.
The line follows the river as mapped in OpenStreetMap; heights from the 30 m Copernicus model, which smooths narrow drops — the published height of the falls is the one above.
Around the falls the river drops 47 m in 3.6 km. Here the river runs about 28 m below the lower rim of its valley.
What is around.
- —viewpoints
- —waymarked walking routes
- 1car parks
- —swimming spots
- —picnic sites
- 1toilets
- —information boards and visitor centres
- —bus stops within 1 km
- —other named waterfalls within 4 km
- —caves
- —campsites
- —hotels, B&Bs and huts within 6 km
- 1restaurants and cafés within 3 km
Counted in OpenStreetMap, the map anyone can edit, up to 2 km around the falls (unless noted). A low number may just mean nobody has mapped it yet. © OpenStreetMap contributors (ODbL).
Towns nearby
- Chiang Muan14 km in a straight line
- Ngao24 km in a straight line
Weather
The weather, month by month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Afternoon °C | 27 | 31 | 34 | 35 | 32 | 31 | 30 | 29 | 29 | 29 | 28 | 26 |
| Night °C | 14 | 16 | 19 | 23 | 23 | 23 | 22 | 22 | 22 | 20 | 17 | 14 |
| Rain & snow (mm) | 17 | 6 | 30 | 81 | 191 | 137 | 199 | 259 | 218 | 104 | 31 | 14 |
| Wet days | 2 | 2 | 5 | 12 | 22 | 21 | 25 | 27 | 24 | 15 | 4 | 2 |
| Sun h/day | 7.4 | 8.1 | 7.2 | 7.6 | 6.6 | 5.2 | 4.2 | 3.9 | 5.1 | 6.0 | 7.4 | 7.2 |
Long-term averages 1991–2020 (NASA POWER) for a cell about 55 km wide, with temperatures carried to the height of the falls (457 m) at −6.5 °C per 1,000 m. Not a forecast.
Photos
Through visitors' eyes.
Recent years
Wet years and dry years
Rain of each month as a share of the 1991–2020 average. A wet season above 100 % usually means a fuller waterfall.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020 | 0% | 0% | 13% | 138% | 69% | 129% | 76% | 154% | 71% | 73% | 50% | 0% |
| 2021 | 37% | 1,100% | 46% | 218% | 62% | 122% | 105% | 97% | 111% | 161% | 81% | 14% |
| 2022 | 235% | 677% | 335% | 163% | 139% | 74% | 113% | 110% | 149% | 125% | 112% | 128% |
| 2023 | 14% | 368% | 49% | 28% | 72% | 100% | 92% | 56% | 154% | 217% | 29% | 68% |
| 2024 | 53% | 16% | 50% | 57% | 97% | 133% | 99% | 181% | 149% | 132% | 101% | 123% |
| 2025 | 2% | 309% | 14% | 131% | 130% | 90% | 210% | 92% | 100% | 107% | 445% | 62% |
130% wetter than usual 70% drier than usual
Compare with the waterfalls nearby.
Than Sawan waterfall
Thailand
- 20 mHeight
- 0.40 m³/sAverage flow
- Jul–OctBest months
Mae Sa Waterfall (Nam tok Mae Sa)
Thailand
- —Height
- 0.15 m³/sAverage flow
- Jul–OctBest months
About these numbers
| Names, height, width, river | Wikidata (Q13016163) · CC0 |
|---|---|
| Height of the drop | © OpenStreetMap contributors · ODbL |
| River flow and catchment | HydroATLAS / RiverATLAS v1.0 (Linke et al. 2019) · CC BY 4.0 |
| Climate | NASA POWER, 1991–2020 |
| Relief, river profile, 3D model | Copernicus DEM GLO-30 · © DLR e.V., © Airbus Defence and Space GmbH, Copernicus/ESA |
| Paths, viewpoints, parking | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
Every figure is an average, an estimate or a count from a public dataset. Licences and methods: data sources.
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