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Last updated: 20:00, 5 Oct 2026
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Rain in London: What You Need to Know
London spreads across the Thames basin, with the North Downs to the south, the Chiltern Hills to the north-west and the Thames Estuary opening to the east. Rain arrives mostly from the south-west across the Home Counties, and the city's size means one shower rarely covers all of it at once. Anyone comparing a forecast with a London rain radar sees the gap quickly, since hyperlocal radar shows where the rain is and where it is heading.
The North Downs and the Chilterns lift and split bands on either side of the basin, and the urban heat island builds summer cells over the centre, so Hampstead Heath, Richmond and the Docklands can each see rain at different times. Two separate mechanisms bring rain to London and the Thames Valley: frontal bands sweeping in from the south-west, and convective storms that build locally once the ground has warmed. The city itself adds heat on top of that, and the Chilterns and North Downs help steer and set off individual cells, so one part of town can be soaked while a neighbouring borough stays completely dry.
In London, England, RainViewer's live map reflects Met Office radar scans as they come in, roughly every 5 minutes. The live map shows whether a shower is over the Downs, crossing the Thames or already at Hyde Park, which a forecast for London cannot tell you.
Rain by Season in London
Autumn and winter frontal season (October to January)
Autumn and winter fronts bring steady rain across the basin, and the Thames and its tributaries run high through the city. Between October and January, one frontal band follows another, and named storms bring wind alongside the rain. The Thames and its tributaries respond to all that repeated rain by rising, with roads, rail lines and low-lying streets typically the first to be hit.
Transition months (February to April)
Cold showers, hail and sun alternate, and forecasts are least reliable because the showers are small and fast. Spring races, park events and weekend sport are the most exposed. Spring showers cross the basin, and the London Marathon in April runs the whole course in whatever the sky brings.
Summer storm season (May to September)
From May to September, heat builds over the built-up area until thunderstorms break, producing short, intense rain that can flood roads and stations within minutes. Festivals, tennis and open-air events hinge on which way a storm cell tracks, which radar reveals before the sky itself does. Summer brings Wimbledon in July and Notting Hill Carnival on the August bank holiday, and a thunderstorm can flood streets within the hour, as in July 2021.
Why You Need a Rain Radar in London
Wimbledon and outdoor sport fans
Rain stops play on the outside courts at Wimbledon, and queues on Wimbledon Park grass sit in the open. Check the radar for the next dry window and time the move.
Notting Hill Carnival and festival crowds
Notting Hill Carnival and summer festivals in Hyde Park fill open streets and lawns. Watch the shower approach and plan the shelter.
Tube, bus and cycle commuters
Cyclists, bus commuters and anyone crossing a bridge on foot can wait for a shower to pass on the radar and cross in the gap.
Thames Path and Hampstead Heath walkers
The Thames Path and Hampstead Heath are open-air walks with little shelter. Watch whether the cell clears and time the walk.
RainViewer Radar Coverage in London
RainViewer shows UK precipitation using data from the Met Office, the national weather service, which runs a network of C-band dual-polarization weather radars. The Met Office network also feeds the European OPERA composite, and the RainViewer map refreshes with each new scan, about every 5 minutes. From London the map also covers Croydon, Wembley and Hounslow.
London Rain Radar: Frequently Asked Questions
- How does rain affect Wimbledon in London?
Rain stops play on the outside courts, the Centre Court and Court One roofs keep matches going, and queues on the grass sit in the open. Spectators watch the sky for the gap. RainViewer shows the shower crossing the Thames.
- Does rain affect the Tube and roads in London?
Yes, heavy rain slows the North Circular, the M25 and central bus routes, and surface water can close stations and underpasses. Check the radar before heading out. RainViewer shows whether the cell is heading your way or already past.
- Does London flood when it rains?
Yes, London has flash flooding when intense rain overwhelms the drains, as in July 2021 when Tube stations and streets flooded, and the Thames Barrier guards against tidal surges. A look at the live radar shows whether a heavy band is heading your way.
- When is the best time to visit London to avoid rain?
May to September is the best window to visit London, with the parks, the Thames Path and Kew Gardens at their best. Summer storms blow through fast. The radar in the morning shows the best window for time outside.
- Why can it rain on Hampstead Heath while the Docklands stays dry around London?
The Chiltern edge to the north lifts showers over Hampstead Heath, while the Docklands in the east basin, close to the estuary, can stay dry until the band drifts across. RainViewer draws each shower where it actually is, which is why a look at Hampstead Heath and the Docklands can give different answers.
- Why does RainViewer refresh so often in London?
The map for London updates about every 5 minutes because the underlying Met Office radar scans arrive on that cycle, not a slower forecast update. Met Office dual-polarization radars separate heavy convective rain from lighter frontal rain, which matters here because the intense summer downpours are the ones that flood underpasses and stations. That frequent, hyperlocal refresh is what catches a shower building or clearing over a specific street.
- What can I do with RainViewer in London beyond checking current rain?
Set a rain alert on Hyde Park or Wimbledon and RainViewer warns you before rain arrives. That lets you time a commute or a match. The 2-hour forecast in 5-minute slices shows the next gap, and saved locations track Hampstead Heath and the Docklands.
Track Rain in London in Real Time
A Wimbledon queue and a walk along the Thames Path both depend on a dry gap, and RainViewer shows the next one.
Rain in London arrives in bands from the south-west, and summer storms can appear within minutes.
The forecast says rain in London this afternoon. RainViewer's live hyperlocal radar shows the cell over the Downs with Hyde Park still dry, and that decides when the walk starts.
Track rain in London — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
Two hours of 5-minute steps let you time the walk along the Thames Path to the minute.
Rain alerts before arrival
Put an alert on Hyde Park. RainViewer warns you minutes ahead, which settles whether to leave for the station now or wait.
Direction arrows on the map
Rain reaches London most often from the south-west, so the arrows tell you at a glance whether a cell is heading your way.
48 hours of radar history
The 48-hour history shows what fell on the North Downs, which is the fastest way to judge ground conditions.
Multiple locations
Save Hyde Park, Hampstead Heath and Wimbledon and check all three in one look.
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