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Last update: 21:00, 5 Oct 2026
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Rain in Farnham: What You Need to Know
Farnham sits on the River Wey in west Surrey, with the Georgian town centre and Farnham Castle rising above the river and the wooded slopes of the Surrey Hills and the North Downs Way climbing a short way to the north and south. A Farnham rain radar makes the difference here, since hyperlocal radar reads the storm cell directly instead of relying on an area-wide guess.
London and the Thames Valley are low and inland, so rain here is a mix of frontal bands from the south-west and convective storms that grow over warm ground. The urban heat island adds energy over the built-up area, and storms can stall over one borough while the next stays dry. Rain reaching Farnham comes up from the Channel and crosses the chalk of the North Downs before dropping into the Wey valley, so the higher ground either side of the town often catches a shower first. The River Wey through Farnham responds fast to rain on the surrounding hills, and low meadows near the river can flood while the Castle on its mound stays clear.
The radar map covering Farnham, England, draws directly on Met Office data, refreshed about every 5 minutes as new scans arrive. The live map shows whether a shower is still on the Downs or already crossing the Wey below the Castle, the kind of hyperlocal detail a forecast for Farnham cannot give.
Rain by Season in Farnham
Autumn and winter frontal season (October to January)
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. Fronts crossing the Downs bring steady winter rain, and the River Wey through Farnham can rise quickly after a prolonged spell on the surrounding hills.
Transition months (February to April)
Showers cross the Downs and the Surrey Hills quickly in spring, and walks in Farnham Park are the plans most often cut short. 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.
Summer storm season (May to September)
Summer showers are short, and the town's Georgian streets and Farnham Park depend on gaps between them. 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.
Why You Need a Rain Radar in Farnham
Farnham Castle and town centre visitors
Visitors to Farnham Castle and the Georgian streets below it can see whether a shower crossing the Downs will reach the town before it clears.
Riverside walkers along the Wey
The River Wey through Farnham can rise quickly after rain on the surrounding hills, and the low meadows beside it are the first to flood. Check the radar for rain over the higher ground before setting out.
Farnham Park walkers
The open ground and old deer park at Farnham Park have little shelter from a shower crossing the hills. Watch the cell approach on the map before heading out.
Commuters on the A31 and at Farnham station
The A31 and the walk to Farnham railway station both carry heavy traffic and passengers toward Guildford and London, and standing water builds fast in heavy rain. Look at the radar and choose between leaving now and holding back.
RainViewer Radar Coverage in Farnham
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 Farnham the map also covers Guildford, Aldershot and Haslemere.
Farnham Rain Radar: Frequently Asked Questions
- How does rain affect a walk in Farnham Park?
The open ground of the old deer park at Farnham Park gives walkers little shelter, and a shower crossing the Surrey Hills can reach it with barely any warning. Visitors watch the radar rather than the sky over the town centre. RainViewer shows the shower crossing the hills toward the park.
- Does rain affect the A31 near Farnham?
Yes, the A31 through Farnham slows in heavy rain, and spray builds where the road climbs toward the Hog's Back and the Downs. A quick look at the map helps before joining the road. RainViewer shows whether the shower is still approaching or already behind you.
- Does Farnham flood when it rains?
Yes, the River Wey through Farnham can rise quickly after heavy rain on the surrounding hills, and low riverside meadows are the first affected. Farnham Castle on its mound and the higher Georgian streets stay well clear. The radar shows whether more rain is falling on the hills.
- When is the best time to visit Farnham to avoid rain?
May to August is the best window to visit Farnham, when Farnham Castle, the Wey riverside and Farnham Park are at their most pleasant. Spring can still bring quick showers off the Downs. A quick radar check over coffee shows where the dry stretch falls.
- Why can it rain on the Wey riverside meadows while Farnham Castle stays dry around Farnham?
The low meadows beside the Wey flood first when the river rises after rain on the surrounding hills, while Farnham Castle on its raised mound above the town stays dry through the same event. A forecast covers both places with one number, while the radar map shows the rain crossing the Wey riverside meadows and missing Farnham Castle.
- What makes the Farnham radar map different from a satellite view?
A satellite view of Farnham shows cloud from above, while RainViewer's radar map shows the rain itself, measured directly by Met Office ground radar. 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 reading is closer to what is actually falling on the street.
- What can I do with RainViewer in Farnham beyond checking current rain?
Set a rain alert on Farnham Park or the Wey riverside and RainViewer's hyperlocal radar warns you before rain reaches that spot. That lets you time a walk or a visit. The 2-hour forecast in 5-minute slices shows the next gap, and saved locations track Guildford and Aldershot.
Track Rain in Farnham in Real Time
A visit to Farnham Castle and a walk along the Wey both depend on a dry gap, and RainViewer shows the next one.
Rain around Farnham can turn into a downpour within minutes, so a quick radar check first is worth it.
A weather app says rain for Farnham this afternoon. RainViewer's live, street level radar shows the cell still on the Downs with the Wey riverside still dry, which decides whether the walk starts now.
Track rain in Farnham — 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 Wey to the minute.
Rain alerts before arrival
Put an alert on the railway station. RainViewer warns you minutes ahead, which settles whether to leave for the platform now or wait.
Direction arrows on the map
Rain reaches Farnham 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 Downs above Farnham, which is the fastest way to judge ground conditions.
Multiple locations
Save the railway station, Farnham Park and the Wey riverside and check all three in one look.
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