Track rain across Kanchanaburi in real time with Rain Viewer, a hyperlocal rain radar app, updated every 5 minutes, street by street.
Kanchanaburi rain comes from the mountains and it arrives suddenly. The Tenasserim Hills along the Myanmar border wring moisture from southwest monsoon air, and the rain feeds the Kwai Noi and Kwai Yai rivers — the rivers that power the Vajiralongkorn and Sri Nakharin dams. The tourist areas — the Bridge on the River Kwai, the Death Railway route, Erawan National Park — sit in a landscape where mountain rain and lowland rain behave very differently.
Erawan National Park's waterfalls and trails are the specific point where rain creates urgent decisions. The trails to the upper tiers become dangerous within minutes of a heavy cell hitting the upper catchment. A clear sky at the car park means nothing if rain is falling 10km upstream.
The mountainous western districts receive considerably more rain than the eastern lowlands — over 1,500mm annually in some areas. Peak risk is August and September.
May often brings the first flash flood events. October's late-season cells carry disproportionate flood risk because rivers are already high.
January and February are the driest months. April sees the first pre-monsoon showers.

Jedno dotknięcie i deszcz w tym konkretnym miejscu wyjaśnia się sam — ujawnia intensywność, typ opadów, temperaturę chmur i powietrza oraz krajowe alerty na żywo, a nawet najmniejsze komórki opadów można łatwo zlokalizować i porównać.
A cell over the upper catchment turns trails dangerous within 20–30 minutes as water level rises. Checking the radar before entering the upper sections is basic safety.
Landslides close the line after heavy rain. Checking the radar before a day trip tells you whether the mountain sections are in a rain band.
Raft house operators monitor upstream cells before letting guests onto the water. A storm 20km upstream can raise the river at the rafts within an hour.
Rain Viewer combines central and western Thailand radar for Kanchanaburi. From here, you can track rain in Ratchaburi, Suphan Buri, and Nakhon Pathom — useful if you're driving Route 323 toward Bangkok or heading into the national parks near the Myanmar border. Mountainous terrain in the far west creates some radar shadow zones.
Czasami trochę zbyt entuzjastycznie podchodzi do prognoz dotyczących deszczu, ale jest dokładna i warta swojej ceny za obrazy radarowe i jest to jedyna aplikacja radarowa, którą zachowałem i jeszcze nie odinstalowałem
Duncan Stewart
Muszę jeszcze raz zmienić moją opinię, to wciąż najlepiej działająca aplikacja w sklepie z aplikacjami. Problem, który miałem, był związany z moim telefonem, a nie z tą najlepszą aplikacją.
Jim Tigs
Every 5 minutes. During flash flood risk periods — when mountain rain can reach valley rivers in under an hour — this frequency provides the earliest practical warning.
The radar network covers most of the Tenasserim Hills area. Rain falling in the upper Kwai catchment is visible on the map, which is what matters for downstream flood awareness.
Kanchanaburi's rain starts in the Tenasserim Hills and arrives at the valley without warning. The map updates every 5 minutes — often 2–5 minutes faster than other apps — so by the time a cell is hitting the upper Kwai catchment, you've already seen it before the water starts rising at the trails or the raft houses.
Rain Viewer Essential gives you:
A 7-day forecast tells you August will be wet. Rain Viewer tells you whether the upper catchment is clear enough to hike to tier seven or turn back now.
Track rain in Kanchanaburi — free
Upgrade to Essential for alerts, forecasts, and full radar history