Is it raining now in Coulsdon?
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Last updated: 20:00, 5 Oct 2026
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Rain in Coulsdon: What You Need to Know
Coulsdon sits where south London meets the North Downs, with Farthing Downs rising as open chalk grassland just south of the high street. Rain reaches it from the south-west, and the high ground above town can catch more than the streets down in the valley. Checking a Coulsdon rain radar takes seconds, and hyperlocal radar shows which part of town the rain is actually crossing.
Farthing Downs rises sharply south of Coulsdon, so a shower crossing the open chalk grassland up there can reach the ridge before it reaches the lower streets around the high street. 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.
For Coulsdon, England, RainViewer pulls live Met Office radar data straight onto the map, with a fresh scan roughly every 5 minutes. The live hyperlocal map shows whether a shower is still over Farthing Downs or already at the high street in Coulsdon, which a forecast for the area cannot tell you.
Rain by Season in Coulsdon
Autumn and winter frontal season (October to January)
Frontal rain from the south-west is steady through this period, and the streams feeding the valley below Farthing Downs rise after repeated bands. 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.
Transition months (February to April)
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. Spring showers, hail and sun alternate over the Downs, and walkers on Farthing Downs are the ones most often caught by a sudden change.
Summer storm season (May to September)
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. Summer storms can build fast over the warm, open ridge, and Farthing Downs and the high street both depend on short dry windows.
Why You Need a Rain Radar in Coulsdon
Farthing Downs walkers
The ancient chalk grassland south of Coulsdon gives wide views but almost no shelter once away from the car park. Checking the radar before setting out shows whether the walk will stay dry.
Commuters at Coulsdon Town and Coulsdon South stations
The walk to either station crosses open streets on rising ground with little cover. Watching the cell approach shows whether to wait indoors or head straight out.
Shoppers on the high street
Coulsdon's high street fills with shoppers, and a downpour can send them under cover quickly. A look at the radar first shows whether the trip will stay dry.
Drivers on the A23 and A237
Heavy rain slows the A23 and the A237 through Coulsdon, and spray builds fast where traffic bunches near the stations. Checking the radar before setting off shows whether to leave now or wait.
RainViewer Radar Coverage in Coulsdon
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 Coulsdon the map also covers Purley, Caterham and Kenley.
Coulsdon Rain Radar: Frequently Asked Questions
- How does rain affect a walk on Farthing Downs?
The ancient chalk grassland south of Coulsdon sits on the ridge above the town, and a shower reaching this high ground can arrive before it reaches the streets below. Regular walkers check conditions before setting out on the full loop. RainViewer shows the shower crossing the Downs toward the ridge.
- Does rain affect the A23 through Coulsdon?
Yes, heavy rain slows the A23 through Coulsdon, and spray builds where traffic bunches near the stations and the junction with the A237. Look at the radar before merging onto the road. A look at the map shows whether the cell has passed or is still on the way.
- Does Coulsdon flood when it rains?
Coulsdon does not flood often, since much of the town sits on rising ground toward the Downs, but the streams in the valley below Farthing Downs can hold water after prolonged heavy rain. The high street stays largely clear. The radar shows whether more rain is following the first band.
- When is the best time to visit Coulsdon to avoid rain?
May to September is the best window to visit Coulsdon, with Farthing Downs at its driest and the views at their best. Summer storms can still build quickly over the open ridge. Check the radar in the morning and plan the walk around the dry gap.
- Why can it rain on Farthing Downs while the high street below stays dry around Coulsdon?
Farthing Downs sits on high, open ground that catches an approaching shower first, while the high street in the valley a short way below can stay dry until the band drifts down off the ridge. A forecast covers both places with one number, while the radar map shows the rain crossing Farthing Downs and missing the high street below.
- Is the Coulsdon weather map showing a live radar feed or a forecast?
The Coulsdon weather map on RainViewer shows a live radar feed from the Met Office, refreshed roughly every 5 minutes, not a forecast probability. Dual-polarization radar from the Met Office distinguishes heavy convective downpours from ordinary frontal rain, a distinction that matters in London because it is the convective storms that overwhelm underpasses and flood stations. That hyperlocal radar feed is what sets it apart from a standard forecast app.
- What can I do with RainViewer in Coulsdon beyond checking current rain?
Set a rain alert on Farthing Downs or the high street and RainViewer warns you before rain arrives. That lets you time a walk or a commute around the hyperlocal picture the radar gives. The 2-hour forecast in 5-minute slices shows the next gap, and saved locations track Purley and Caterham together.
Track Rain in Coulsdon in Real Time
A walk on Farthing Downs and a trip to the high street both depend on a dry gap, and RainViewer shows the next one.
Showers and storms cross Coulsdon quickly, so timing shifts faster than a forecast updates.
The forecast says showers in Coulsdon this afternoon. RainViewer's live hyperlocal radar shows the cell still over Farthing Downs with the high street still dry, which decides whether the walk starts now.
Track rain in Coulsdon — 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 on Farthing Downs to the minute.
Rain alerts before arrival
Put an alert on Farthing Downs. RainViewer warns you minutes ahead, which settles whether to keep walking or head for cover.
Direction arrows on the map
Rain reaches Coulsdon 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 ridge south of Coulsdon, which is the fastest way to judge ground conditions.
Multiple locations
Save Farthing Downs, Coulsdon Town station and the high street and check all three in one look.
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