Short answer: Trethorne Leisure Park is the all-weather family option; Hidden Valley's escape room and mansion work in any weather; Lawrence House is free and indoors. Launceston copes with rain far better than the beach towns do.
There's a genuine advantage to being inland when Cornish weather turns: Launceston's attractions were never dependent on sunshine in the first place.
The proper all-weather family option — indoor soft play, bowling, dodgems and arcade games, plus farm animals under cover. Reviewers consistently note how much there is indoors.
Puzzle trails, an escape room and the Professor's Mansion. Some of it is outdoors, but the mansion and escape room work regardless, and visitors routinely plan two hours and stay five.
Three floors of local history, free to enter, with a Victorian playroom and an owl trail for children. Genuinely good value for a wet hour.
A record shop and café combined, with records spinning and arguably the cheapest coffee in town. A properly pleasant place to wait out a shower, and dog-friendly.
A teddy bear house hidden in an industrial unit, with themed rooms and a secret-room puzzle. Cheap entry, entirely indoors, and genuinely charming.
Liberty Coffee closes Sundays and Mondays, and Launceston Steam Railway doesn't run every day. On a wet Monday in particular, check what's actually open before driving in — Trethorne and Hidden Valley are the more reliable bets.
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