Go west. The best rainy-day plan in Lower Manhattan is the World Trade Center side of the neighborhood, because the Oculus, the shopping concourse, the memorial museum and Brookfield Place are all indoors and mostly connected underground. You can do a full day down there and barely open your umbrella.
We get asked about this a lot in spring and fall, when a forecast turns and a whole day of walking plans falls apart. Here's what we actually tell guests.
The dry route west
From John Street, walk a block to the Fulton Center and go down. The underground passage runs west from Fulton Center under Dey Street to the World Trade Center transit hub, so you can get from the corner of Broadway and Fulton all the way to the Oculus without going back to street level. It's about a ten-minute walk underground and it's the single most useful thing to know about this neighborhood in bad weather.
The Oculus itself is worth the walk even if you buy nothing. It's the white ribbed hall Santiago Calatrava designed over the transit hub, and standing in the middle looking up at the skylight is a genuine architecture moment. The Westfield shops line the concourse around it, and there's a decent food hall level if you just need to sit somewhere warm.
The 9/11 Memorial Museum
This is the one indoor thing downtown that people plan whole trips around. It's entirely below ground, it takes two to three hours if you read the exhibits, and it is heavy going. Book a timed ticket online before you go, because walk-up availability on a rainy day is the worst it gets. If you're traveling with younger kids, it's worth reading up on what's in the historical exhibition first and deciding how much of it you want them to see.
Brookfield Place and the Winter Garden
Keep going west, under West Street, and you land at Brookfield Place. The Winter Garden is a glass atrium with palm trees, a marble staircase and harbor views, which is a strange and pleasant thing to be standing in while it pours outside. Hudson Eats upstairs is a food hall with counters from a lot of names you'll recognize, and Le District on the lower level is a French market with a sit-down side. It's also where the waterfront promenade starts if the rain lets up.
East of Broadway, closer to us
If you don't want to go west, the Seaport is five minutes the other direction. The Tin Building on Fulton Street is Jean-Georges' food market in the rebuilt fish-market building: stalls, restaurants, a lot of things to look at, all under one roof. It's an easy hour and a good rainy lunch.
Fraunces Tavern Museum at 54 Pearl Street is the sleeper pick. It's the 18th-century building where Washington said goodbye to his officers in 1783, now a small museum with a working tavern downstairs. Small, quiet, quick, and the kind of place you'd never bother with on a sunny day. The Museum of Jewish Heritage in Battery Park City is the more substantial option if you want a serious couple of hours.
And there's always the Staten Island Ferry. It's free, it runs every day in every weather, and the cabin is enclosed. Twenty-five minutes each way past the Statue of Liberty with rain on the windows is a better experience than most paid harbor cruises. The terminal at Whitehall is about a 12-minute walk from John Street.
The churches nobody thinks of
St. Paul's Chapel on Broadway at Fulton and Trinity Church at Broadway and Wall are both a few minutes away and both free to walk into. St. Paul's is the oldest church building in Manhattan still standing, and it served as a relief center after 9/11. Ten quiet minutes out of the weather, and you're right back on your way.
Or just stay in
Honestly, some rainy days are best spent not going anywhere. That's part of why the suites here have full kitchens: you can do a grocery run, cook something, and let the afternoon go. There's a fitness center and a guest lounge in the building, plus a laundry room, which is the sort of thing that turns a washout day into a useful one. If you're here for work, the conference room is downstairs.
What to skip when it rains
The Brooklyn Bridge walk, the Battery Park waterfront and the outdoor part of the 9/11 Memorial plaza are all much worse in the wet, and the bridge in particular is slick and crowded with umbrellas. Save them. Lower Manhattan weather turns fast, and a gray morning here often clears by four.