Is it raining now in Caterham?
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Last updated: 20:00, 5 Oct 2026
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Rain in Caterham: What You Need to Know
Caterham sits in a narrow valley cut into the North Downs in east Surrey, with the town split between the valley floor and Caterham on the Hill above, and open chalk downland rising close on both sides. Rain reaching this part of the Downs is lifted sharply by the surrounding slopes. Pulling up a Caterham rain radar clears this up quickly, as hyperlocal radar shows the rain's real position rather than a general outlook.
Frontal rain arrives from the south-west, but summer storms are the real forecasting problem. Heat trapped over the city and the Chilterns and North Downs steer and trigger cells, and drainage can be overwhelmed within minutes by a storm that a forecast rated as a chance of showers. The steep sides of the Caterham valley lift approaching showers quickly, giving the town a hyperlocal split where Caterham on the Hill above can be well soaked while the valley floor below stays comparatively dry.
RainViewer's coverage of Caterham, England, comes from Met Office radar, with the map updating on each new 5-minute scan. The live map shows whether a shower is still building on the Downs above or already dropping into the valley, which a forecast for Caterham cannot tell you.
Rain by Season in Caterham
Autumn and winter frontal season (October to January)
Frontal rain arrives in repeated bands, and named storms bring wind as well as rain. Repeated rain raises the Thames and its tributaries, and roads, rail and low-lying streets are affected first. Winter rain over the North Downs saturates the slopes above Caterham fast, and low ground on the valley floor can hold water after repeated bands.
Transition months (February to April)
Spring showers cross the Downs quickly, and walks up onto the ridge are the plans most often caught out. February to April swings between cold showers, hail and bursts of sun, and forecasting is at its least reliable because these showers are small and move fast. That leaves spring races, park events and weekend sport the most exposed to a sudden change.
Summer storm season (May to September)
Summer storms build over the high ground on warm afternoons, and the valley high street and hillside streets depend on the gap between them. Between May and September, heat built up over the city triggers thunderstorms that dump short, intense rain, flooding roads and stations within minutes. For festivals, tennis and open-air events, the storm cell's track matters most, and radar shows that track before it appears in the sky.
Why You Need a Rain Radar in Caterham
North Downs ridge walkers
Walkers heading up from Caterham onto the open chalk ridge climb into fully exposed ground within a short distance. Checking the radar before setting out shows whether a shower is already on the Downs.
Caterham on the Hill residents
Streets on Caterham on the Hill sit higher and more exposed than the valley floor below, and a shower here often arrives first. The radar shows whether the next band is close enough to change plans.
Valley high street shoppers and commuters
Caterham's valley high street and the rail station sit lower and more sheltered, but heavy rain further up the slopes can still send water downhill quickly. Watching the cell on the radar helps time an errand or the commute.
Commuters on the A22 toward Croydon
The road linking Caterham to Croydon climbs out of the valley onto more exposed high ground. Checking the radar before setting off shows whether the cell has already crossed the road.
RainViewer Radar Coverage in Caterham
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 Caterham the map also covers Oxted, Redhill and Croydon.
Caterham Rain Radar: Frequently Asked Questions
- How does rain affect the climb onto the North Downs from Caterham?
The paths climbing from Caterham onto the open chalk ridge leave shelter almost immediately, and a shower on the Downs can arrive well before it reaches the sheltered valley floor below. Walkers check the radar before committing to the climb. RainViewer shows the shower building on the Downs before it drops into the valley.
- Does rain affect the A22 near Caterham?
Yes, the A22 climbs out of the Caterham valley onto more exposed high ground toward Croydon, and a shower here can reduce visibility with little warning. Checking the map before you set off shows the cell's position. RainViewer keeps the picture current with a refresh every five minutes.
- Does Caterham flood when it rains?
Low ground on the valley floor in Caterham can hold water after heavy rain runs down from the surrounding slopes, while Caterham on the Hill above drains more easily. Prolonged wet spells raise the risk on the valley floor most. The radar shows whether more rain is still falling on the Downs above.
- When is the best time to visit Caterham to avoid rain?
May to August is the best window to visit Caterham, when showers over the Downs are shorter and the ridge paths are at their driest. Spring can still bring sudden, cold showers off the high ground. Check the radar in the morning and plan any climb around the gap.
- Why can it rain on the valley high street while Caterham on the Hill stays dry around Caterham?
Rain lifted sharply by the North Downs reaches the higher streets of Caterham on the Hill first, and that side of town can be wet while the valley high street below stays drier a while longer. RainViewer draws each shower where it actually is, which is why a look at the valley high street and Caterham on the Hill can give different answers.
- What makes RainViewer different from a normal weather forecast for Caterham?
A forecast for Caterham predicts rain with a probability, while RainViewer shows the rain the Met Office radar is measuring right now, with a new frame about every 5 minutes. 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 hyperlocal radar view tells you what is happening on your street.
- What can I do with RainViewer in Caterham beyond checking current rain?
Set a rain alert on the valley high street or the North Downs ridge and RainViewer warns you before rain arrives, using a hyperlocal read on exactly where the shower sits. That lets you time an errand or a walk up onto the Downs. The 2-hour forecast in 5-minute slices shows the next gap, and saved locations track Oxted and Redhill together.
Track Rain in Caterham in Real Time
A walk up onto the Downs and an errand on the valley high street both depend on a dry gap, and RainViewer shows the next one.
Showers and storms cross Caterham quickly, so timing shifts faster than a forecast updates.
Your weather app says rain in Caterham this afternoon. RainViewer's live hyperlocal radar shows the cell still building on the Downs with the valley high street dry, which decides whether the climb starts now.
Track rain in Caterham — 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 up onto the Downs to the minute.
Rain alerts before arrival
Put an alert on the valley high street. RainViewer warns you minutes ahead, which settles whether to start the climb now or wait for the shower to clear.
Direction arrows on the map
Rain reaches Caterham 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 above Caterham, which is the fastest way to judge ground conditions.
Multiple locations
Save the valley high street, Caterham on the Hill and Oxted and check all three in one look.
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