Track rain across Phuket in real time with Rain Viewer, a hyperlocal rain radar app, updated every 5 minutes, street by street.
Phuket rain arrives off the Andaman Sea and it does not announce itself gradually. The southwest monsoon from May to October pushes squalls onshore that can deliver 80–100mm in a single afternoon event. The central mountain ridge running north to south along the island's spine creates an orographic effect — the west coast (Patong, Karon, Kata) catches moisture directly off the sea, while the east coast (Rawai, Chalong Bay) can stay relatively dry in the same storm.
The most common urgent use of a radar app in Phuket is ferry departure planning. The Rassada pier (for Phi Phi, Koh Yao) and Ao Makham pier both operate in conditions that change within the hour. A squall forming 15–20km offshore is visible on the radar long before it reaches the pier — enough time to decide whether to board or delay.
Rain Viewer shows you storm cells moving onshore before they arrive, with direction arrows showing their track.
The southwest monsoon is the dominant rain driver. June and September are typically the wettest months, with October bringing intense late-season events. Red flag days on beaches during this period are common when combined seas and wind accompany rain.
May is the season transition when the monsoon establishes itself. Conditions can be clear in the morning and violent by 2pm. October trails off but remains volatile.
Phuket's peak tourist season aligns entirely with the dry window. Even in dry season, isolated showers develop — they appear clearly on the radar well before arrival.
One touch, and the rain at that exact spot explains itself—revealing intensity, precipitation type, cloud and air temperatures, and live national alerts, while making even the tiniest rain pockets easy to pinpoint and compare.
The Rassada pier–Phi Phi route takes 1.5 hours across exposed Andaman waters. A squall forming offshore can close the route mid-crossing or at departure. Seeing the storm track on the radar before driving to the pier is the single most useful planning step.
The west coast catches the brunt of the southwest monsoon. A beach that's fine at 10am can be under a red flag by 1pm. Checking the radar at breakfast tells you whether the morning window holds for the whole day.
Resort drivers need to know whether a guest pickup from the airport will coincide with a heavy cell on Route 402. A 30-minute warning is enough to reroute or delay departure.
Dive trips depart at 7–8am for sites in the Similan islands. Conditions at departure don't always predict conditions at the dive site. Checking the offshore radar track tells the dive master whether a system will intercept the route.
Rain Viewer combines Andaman coast radar for Phuket. From here, the same map shows rain approaching from Phang Nga, Krabi, and the open Andaman — useful if you're driving between the airport and the beach zones or taking ferries to the outer islands.
“A little enthusiastic sometimes with rain predictions but it's accurate and in the money for radar images, and the one radar app I've kept and not uninstalled”
Duncan Stewart
“I must change my feedback once more this is still the best brain app in the app store the issue I was having was with my phone and not this top of the line app one part I really like is the widgets.”
Jim Tigs
Every 5 minutes. During active southwest monsoon squalls that move fast, this frequency is the most useful tool available.
Many visitors do, but mornings are often clear. The key is using the radar to identify the dry windows within each day rather than writing off the whole trip.
Yes. The radar network covers open sea areas around Phuket, and Rain Viewer shows offshore cells with direction arrows indicating their track.
Phuket's rain arrives off the Andaman without warning 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 squall is 15km offshore, you've already seen it tracking toward the pier.
Rain Viewer Essential gives you:
A 7-day forecast tells you June will be wet. Rain Viewer tells you whether the Andaman is clear enough to board now or wait an hour for the squall to pass.
Upgrade to Essential for alerts, forecasts, and full radar history