When we went to Barmouth, there was an icy wind blowing in off the sea in, yes, August.
We were camping on Shell Island, a bit up the coast and several tents had been blown down in a gale the previous night.....
(The current weather forecast for Barmouth is "sunny, max 18deg C, though varying degrees of downpour are forecast from Wednesday onward, typical!)
You have to admire the optimism of British seaside poster artists!
Getting back to railways, when we were at Shell Island, the Halt at Llanbedr still had a GWR pagoda roof hut, I just looked on Google Earth and its been replaced by a bus shelter construction.