Is it raining now in Windsor?
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Last updated: 20:00, 5 Oct 2026
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Rain in Windsor: What You Need to Know
Windsor stands on a chalk rise above the River Thames in Berkshire, with Windsor Castle overlooking the water and Eton on the opposite bank, and the open grounds of Windsor Great Park spreading south of the town. That is the situation a live Windsor rain radar handles well: hyperlocal radar reads the cell over your street, not the average for the region.
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. Rain reaching Windsor comes up the Thames Valley from the south-west across open, low-lying ground, so a band usually crosses the town and Eton at much the same time. Windsor Great Park to the south sits a little higher and can catch a touch more wind-driven rain, while the riverside meadows below the Castle respond quickly to any rise in the Thames upstream.
RainViewer's coverage of Windsor, 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 out over the valley or already at the riverside below the Castle, the kind of hyperlocal detail a forecast for Windsor cannot give.
Rain by Season in Windsor
Autumn and winter frontal season (October to January)
October to January is dominated by band after band of frontal rain, with named storms adding wind on top. As the rain keeps falling, the Thames and its tributaries rise, and it is the roads, railways and low-lying streets that feel the effects first. Fronts up the Thames Valley bring steady winter rain, and the river below the Castle can rise after heavy rain falling well upstream.
Transition months (February to April)
Showers cross the valley quickly in spring, and walks in Windsor Great Park are the plans most often cut short. Through February to April, cold showers, hail and sunny spells trade off quickly, and the small, fast-moving showers make this the hardest stretch of the year to forecast. Spring races, park events and weekend sport all carry the greatest exposure during this period.
Summer storm season (May to September)
Summer showers are short, and the riverside, the Castle and events in the Great Park depend on gaps between them. Heat builds over the built-up area and thunderstorms produce short, intense rain that floods roads and stations in minutes. Festivals, tennis and open-air events depend on the storm cell's track, which the radar shows before the sky changes.
Why You Need a Rain Radar in Windsor
Windsor Castle visitors
The open courtyards and the walk up from the town to Windsor Castle give visitors little shelter from a sudden band. Check the radar before setting out for the gates.
Riverside walkers by the Thames
The Thames below the Castle can rise after heavy rain falling well upstream, even when Windsor itself has seen little rain. Check the radar for rain over the wider valley before walking the towpath.
Windsor Great Park visitors
The open grounds of Windsor Great Park south of the town have little cover across much of their length. Watch the cell approach on the map before heading out.
Eton College and townsfolk crossing the bridge
The footbridge between Windsor and Eton is fully exposed to wind and rain off the river. Check the radar before crossing.
RainViewer Radar Coverage in Windsor
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 Windsor the map also covers Slough, Maidenhead and Staines-upon-Thames.
Windsor Rain Radar: Frequently Asked Questions
- How does rain affect a visit to Windsor Castle?
The open courtyards and the climb up from the town give visitors to Windsor Castle little shelter, and a shower crossing the Thames Valley can arrive with barely any warning. Staff and visitors both watch the radar rather than the forecast. RainViewer shows the shower crossing the valley toward the Castle.
- Does rain affect the roads around Windsor?
Yes, the roads into Windsor slow in heavy rain, and standing water builds where they run close to the river near the bridge to Eton. Check the live radar before setting off. RainViewer shows whether the cell is ahead of you or already past.
- Does Windsor flood when it rains?
Yes, the Thames below Windsor Castle can rise after heavy rain falling well upstream in the wider valley, and low riverside meadows are the first affected, sometimes even when the town itself has had little rain. The Castle on its chalk rise stays well clear. The radar shows whether rain higher up the catchment is continuing.
- When is the best time to visit Windsor to avoid rain?
May to August is the best window to visit Windsor, when the Castle, the riverside and Windsor Great Park are at their most pleasant. Spring can still bring quick showers up the Thames Valley. Look at the radar first thing and put the outdoor part of the day in the dry window.
- Why can it rain on the riverside below the Castle while Windsor Great Park stays dry around Windsor?
The riverside meadows below the Castle can flood from rain falling well upstream with none falling locally, while Windsor Great Park to the south, away from the Thames, depends only on rain falling directly over it. Live radar shows the edge of each cell, so checking the riverside below the Castle and Windsor Great Park separately shows which side of the line you are on.
- Is the Windsor radar map free to use?
The live radar map for Windsor is free on both iOS and Android, showing Met Office data refreshed roughly every 5 minutes. Because London's worst flooding comes from short convective downpours rather than steady frontal rain, Met Office dual-polarization radar earns its keep here by telling the two apart before underpasses and stations start to flood. That hyperlocal detail is available without paying anything to check it.
- What can I do with RainViewer in Windsor beyond checking current rain?
Set a rain alert on the Castle or the riverside and RainViewer's hyperlocal radar warns you before rain reaches that spot. That lets you time a visit or a walk. The 2-hour forecast in 5-minute slices shows the next gap, and saved locations track Eton and Windsor Great Park.
Track Rain in Windsor in Real Time
A visit to the Castle and a walk along the Thames both depend on a dry gap, and RainViewer shows the next one.
Rain around Windsor can turn into a downpour within minutes, so a quick radar check first is worth it.
A weather app says rain for Windsor this afternoon. RainViewer's live, street level radar shows the cell already over the valley with the riverside still dry, which decides whether the walk starts now.
Track rain in Windsor — free Upgrade to Essential for alerts, forecasts, and full radar history
2-hour forecast in 5-minute slices
Slice the next two hours into 5-minute steps and pick the gap for the walk along the Thames.
Rain alerts before arrival
An alert on the Castle arrives while the rain is still on its way, and that decides whether to head out now or wait under cover.
Direction arrows on the map
In Windsor the wet weather tends to come from the south-west, and the arrows show the track of every shower.
48 hours of radar history
Scroll back over the Thames Valley above Windsor to see what actually fell overnight.
Multiple locations
Track the Castle, the riverside and Windsor Great Park together and compare which one is dry.
RainViewer
