Short answer: Penzance does rain better than most Cornish towns: proper cafés you can sit in for two hours, with Chapel Street's galleries and the town's indoor culture a short dash away.
Penzance is a real, year-round working town — which is exactly what you want when the forecast dies. Unlike the beach villages, nothing here depends on sunshine: the cafés expect lingerers, and the interesting streets are lined with doors to duck through.
The joy of Penzance in the rain is that everything is a two-minute dash: Chapel Street's galleries and antique shops, Penlee House for the Newlyn School paintings (the town's best wet-weather hour), and the Exchange for contemporary shows. Do brunch, then culture, then a second coffee — the classic wet-morning triangle.
You're twenty minutes' walk along the prom from Jubilee Pool — the art-deco lido that's arguably better in dramatic weather than in sunshine — and the St Michael's Mount causeway is a short hop along the bay at Marazion. A rained-off morning here converts into an afternoon faster than anywhere else in west Cornwall.
Weekday mornings you'll walk into anywhere above; weekend brunch peaks ten till noon. Storm-watching from the promenade is a legitimate Penzance activity, but on the biggest swells respect the spray zone — the sea here clears the railings. Wet-day plans for the whole area are in the Penzance guide.
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