Gampaha sits in Sri Lanka’s southwestern wet zone, where the southwest monsoon from May through September brings the island’s heaviest rainfall, supplemented by a second wet spell during the October-to-December inter-monsoon period.
Inland from Colombo, the city’s Attanagalu Oya river can rise quickly during intense southwest monsoon downpours. The catastrophic May 2017 floods and landslides, triggered by an intense burst of southwest monsoon rain, remain the reference event for how quickly this densely populated region can flood, and Sri Lanka’s Department of Meteorology relies heavily on radar to track incoming monsoon rain bands. Learn more: Flash Flood Warning Signs on Radar · Open the full Rain Map
Frequently Asked Questions
Is it raining in Gampaha right now?
The live radar map above shows precipitation over Gampaha, Western Province in real time. Blue shades indicate light rain, while yellow, orange, and red mark heavier downpours. If no colored echoes appear over Gampaha, no significant rain is currently being detected.
How often does the Gampaha rain radar update?
The radar refreshes continuously, typically every few minutes, so the map reflects current conditions rather than an hours-old forecast. Press play to animate the most recent frames.
Can I see if a storm is heading toward Gampaha?
Yes. Press play on the radar to animate the last few hours of rainfall and watch which way rain cells over Western Province are moving – the clearest way to judge whether a shower will reach Gampaha or pass by.
Is this Gampaha rain radar free to use?
Yes, completely free – no account, app download, or sign-up required. It works in any browser on desktop and mobile.