Live Rain Radar for Surat Thani
Monitor rain across Surat Thani, Koh Samui, and the Gulf Coast in real time. Updated every 5 minutes.
Local Weather Context
Surat Thani province stretches from the Gulf of Thailand coastline to rainforest-clad mountains inland, including the gateway to Koh Samui, Koh Phangan, and Koh Tao. The province’s weather is uniquely shaped by the Gulf monsoon pattern — its wet season peaks later than western Thailand, running through November–January when other regions are dry.
Seasons
Wet season (October–January)
The northeast monsoon brings moisture inland from the Gulf of Thailand. November is the wettest month, often with rainfall exceeding 400 mm. Severe flooding has affected Surat Thani city and nearby areas in several recent years. Koh Samui can receive its entire monthly rainfall in a single storm.
Transition months (February, September)
February marks the end of the monsoon. September sees increasing cloud cover and occasional squalls as the inter-monsoon period begins.
Dry season (March–August)
Relatively drier but never completely dry — monthly rainfall remains above 50 mm. Sea conditions are calmest from March–May, making this the peak season for island tourism.
NEW! Tap Anywhere to Inspect
2 Feb 2026One tap, and the rain at that precise spot tells its own story—showing intensity, precipitation type, cloud and air temperatures, and live national alerts, while making even the smallest rain pockets easy to identify and compare.
Who Needs Rain Radar Here
Island ferry operators
Ferries between Donsak, Koh Samui, Koh Phangan, and Koh Tao must monitor the weather constantly. Radar displays squall lines over the Gulf before they reach ferry routes.
Koh Samui tourists
Visitors planning beach days, snorkelling trips, and Full Moon Party travel to Koh Phangan use radar to check conditions before booking boats.
Rubber and palm oil farmers
Surat Thani is Thailand's largest rubber-producing province. Farmers schedule tapping around rainfall — rubber cannot be collected in the rain.
Flood preparedness teams
Provincial disaster prevention offices monitor radar during the monsoon season to coordinate evacuations and sandbagging operations along the Tapi River.
Radar Coverage
Rain Viewer covers Surat Thani province, the Gulf islands, and offshore waters. Gulf-based storms heading towards the coast are visible well in advance. Coverage extends to Koh Samui, Koh Phangan, and Koh Tao with enough detail to track storm movement between islands.
What Our Users Say
-
“A little overenthusiastic at times with rain predictions, but it's accurate and spot on for radar images, and it's the one radar app I've kept and not uninstalled”
Duncan Stewart -
I must update my feedback once again – this is still the best brain app in the app store. The issue I was experiencing was with my phone, not this top-tier app. One feature I particularly like is the widgets.
Jim Tigs
Explore Radar Coverage
FAQ
Why is Surat Thani's wet season different from Bangkok's?
Surat Thani faces the Gulf of Thailand and receives the northeast monsoon (October–January), while Bangkok's rainfall comes mainly from the southwest monsoon (May–October).
Can I check radar before taking a ferry to Koh Samui?
Absolutely. Check the radar animation for squall lines between the mainland and islands. If heavy rain cells are crossing the ferry route, consider delaying your journey.
How does radar help with flood warnings?
Sustained heavy rainfall visible on radar over the upper Tapi River basin signals potential flooding downstream in Surat Thani city, usually 6–12 hours later.
See rain in Surat Thani before it closes the ferry route
Surat Thani’s rain arrives from two directions and doesn’t follow Bangkok’s forecast. The map updates every 5 minutes — often 2–5 minutes faster than other apps — so by the time a northeast monsoon cell is crossing the Gulf towards Donsak, you’ve already seen it coming.
Rain Viewer Essential gives you:
- A 2-hour rain forecast in 5-minute intervals — not hourly blocks, so you can see the precise window when the squall passes and the Koh Samui or Koh Phangan crossing is possible again
- Rain alerts that trigger before rain arrives — set Donsak pier, the Tapee River flood zone, or your rubber plantation and get notified while you can still change your plans
- Direction arrows on the map — so even when the animation is unclear, you can see whether the Gulf cell is tracking towards the pier or moving south towards Nakhon Si Thammarat
- 48 hours of radar history — see how yesterday’s northeast monsoon front moved through the province and spot the same pattern building today
- Multiple locations — track rain at Donsak pier, the Surat Thani night market, and your orchard in the interior at the same time
A 7-day forecast tells you November will be wet. Rain Viewer tells you whether the Gulf is clear enough to drive to Donsak now or wait three hours.
Track rain in Surat Thani — free
Upgrade to Essential for alerts, forecasts, and full radar history
