Short answer: Padstow is compact enough to do in dashes: the National Lobster Hatchery is the anchor indoor attraction, with the museum, harbour galleries, delis and cafés all within two minutes of each other.
Everything in Padstow worth going indoors for sits within a few hundred metres of the harbour. A wet day here isn't one long soaking — it's a series of ten-second dashes between doors, which is a very different proposition.
The National Lobster Hatchery on the quay is the proper indoor attraction: a working marine conservation project where you meet the lobsters being raised for release. It's small — under an hour — genuinely interesting for kids, and your ticket funds the actual conservation. The obvious first stop when the rain starts.
Two Padstow classics are honestly fine in drizzle: crabbing off the harbour wall (the crabs don't care — our Padstow crabbing guide has the how) and the Camel Trail in proper coats, which is flat, firm and often at its most atmospheric with the estuary under low cloud. Save both for lighter rain; neither survives a hooley.
Padstow's indoor list is charming but short. When the forecast is all-day heavy, the honest advice is lunch here and then drive: Wadebridge's cinema and indoor options are fifteen minutes up the Camel. The Padstow guide has the full picture for better days.
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