There is a point in a bad week of weather where the answer is not another London museum. It is a train, and somewhere with a roof at the other end.
13 August 2026 · 4 min read
This site has one rule and it is not really about London. It is about roofs.
Which means there is a version of a wet Saturday where the honest advice is to stop looking at the same twelve postcodes and get on a train. An hour out of Paddington or Euston, still indoors at the other end, and back before dark.
The rule still applies, though, and it disqualifies most of what gets sold as a day trip. Stonehenge is a field. Warwick Castle is a hill with some buildings on it. Bicester Village, which the outlet people would very much like you to consider, is an open-air shopping street in Oxfordshire, and standing in the rain to queue outside a shop is not an improvement on standing in the rain in London.
These seven have a roof.
The one everybody means when they say "the Harry Potter thing", and it is genuinely enormous: two soundstages of standing sets, the Great Hall, Diagon Alley, the actual Hogwarts model.
The relevant fact for our purposes is that it is a film studio. Film studios are big sheds. Once you are through the door you are indoors for three or four hours, and the coach from Victoria drops you at the entrance, so the only weather you meet is the walk to the bus.
The oldest occupied castle in the world, and more usefully, the State Apartments, which are indoors and go on for some time.
Half an hour from Paddington. The chapel is worth the ticket on its own: eleven monarchs are in there, Henry VIII among them, under a fan-vaulted ceiling that took fifty years. There is a courtyard to cross, so this is not quite door to door, but the walking bit is minutes and the rest is roof.
Technically still London, which feels like cheating, except that it is thirty-five minutes on a train from Waterloo and feels nothing like London when you arrive.
Six acres of Tudor and Baroque buildings, most of it under cover, including Henry VIII's kitchens, which were built to feed six hundred people twice a day and still smell faintly of woodsmoke. Ignore the maze in the rain. Everyone does.
Greenwich, on the DLR, so barely a train at all. Included because the Painted Hall is the single most underrated interior in the country.
Thornhill spent nineteen years on that ceiling. People call it Britain's Sistine Chapel, which is the sort of comparison that usually collapses on arrival, and this one does not. You lie back on the provided mirrored trolleys and look up, warm and dry, while it hammers down on the roof.
Next door, and worth pairing with the above on the same trip.
The last tea clipper afloat, raised eleven feet in the air so you can walk underneath the hull and look up at the copper. Being under a ship while it rains is a specific and excellent feeling, and there is a cafe under there too, which suggests somebody at Royal Museums Greenwich understands the weather.
Up the hill from the other two, which is the one exposed bit of this entire list, so take the bus if it is properly coming down.
Worth it for the Time galleries, which contain Harrison's sea clocks: four attempts by one Yorkshire carpenter to solve longitude, which he did, after forty years, while the scientific establishment told him it could not be done that way. The meridian line outside is the famous bit and the least interesting thing in the building.
Not a train at all, and included because it is the best value here and almost nobody who lives in London has done it.
The high walkways are forty metres up with a glass floor, so you stand there watching buses pass under your shoes. Then you go down to the Victorian engine rooms and look at the steam machinery that lifted the bascules until 1976. Sixteen pounds, entirely indoors, and you have walked past it four hundred times without going in.
Leaving London is allowed. Getting rained on is not.
The test for a day trip in bad weather is not how famous the place is or how good the photographs look in July. It is the ratio of covered minutes to exposed ones, from the moment you leave the station. On that measure a film studio in Watford beats a stone circle on Salisbury Plain by a distance neither of them would enjoy hearing about.
If you would rather not leave at all, everything that works when it is chucking it down is here.