Wales Guide
Weather
The English preoccupation with the weather holds equally for the Welsh. The climate here is temperate, with Welsh summers rarely getting hot and nowhere but the tops of mountain ranges ever getting very cold, even in midwinter. Temperatures vary little from Cardiff in the south to Llandudno in the north, but proximity to the mountains is a different matter: Llanberis, at the foot of Snowdon, gets doused with more than twice as much rainfall as Caernarfon, seven miles away, and is always a few degrees cooler. With rain never too far from the mind of any resident or visitor, it is easy to forget that throughout much of the summer, Wales – particularly the coast – can be bathed in sun. Between June and September, the Pembrokeshire coast, washed by the Gulf Stream, can be as warm as anywhere in Britain.
The bottom line is that it's impossible to say with any degree of certainty that the weather will be pleasant in any given month. May might be wet and grey one year and gloriously sunny the next, and the same goes for the autumnal months – November stands an equal chance of being crisp and clear or foggy and grim. Obviously, if you're planning to lie on a beach, or camp in the dry, you'll want to go between June and September – a period when you should book your accommodation as far in advance as possible. Otherwise, if you're balancing the likely fairness of the weather against the density of the crowds, the best time to get into the countryside or the towns is between April and May, or September and October. If outdoor pursuits are your objective, these are the best months for walking, June to October are warmest and driest for climbing, and December to March the only times you'll find enough water for kayaking.