Portsmouth sits in England under Britain’s temperate maritime climate, where rain falls fairly evenly throughout the year but the most damaging flooding usually comes from slow-moving Atlantic storm systems that stall over the country in autumn and winter.
Built largely on Portsea Island, the city’s low elevation makes it particularly sensitive to the combination of heavy rain and high tide. Named storms such as Storm Desmond in 2015 and Storm Dennis in 2020 have shown how days of persistent rain can push rivers to record levels well after the rain itself has passed, which is why the UK’s Environment Agency and Met Office lean heavily on radar alongside river gauges. The Met Office operates the national weather radar network. Learn more: Flash Flood Warning Signs on Radar · Open the full Rain Map
Frequently Asked Questions
Is it raining in Portsmouth right now?
The live radar map above shows precipitation over Portsmouth, England in real time. Blue shades indicate light rain, while yellow, orange, and red mark heavier downpours. If no colored echoes appear over Portsmouth, no significant rain is currently being detected.
How often does the Portsmouth 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 Portsmouth?
Yes. Press play on the radar to animate the last few hours of rainfall and watch which way rain cells over England are moving – the clearest way to judge whether a shower will reach Portsmouth or pass by.
Is this Portsmouth 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.