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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the UrbanMixr weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above to see what is heading your way. For the best window of dry weather in Carmarthen, aim for late spring (May-June) or early autumn (September), when the town sees fewer wet days and more manageable temperatures for exploring.
What is the weather like in Carmarthen today and tomorrow?
The weather in Carmarthen is often shaped by its inland valley location, bringing milder conditions than the coast but also a chance of mist and low cloud in the mornings. As shown in the live forecast above, expect a mix of cloud and sunshine today, with a possible shower pushing in from the west later. For the exact timings, check the 10 Day Weather Forecast UK page for Carmarthen.
What to pack for a trip to Carmarthen
A waterproof jacket is a sensible choice year-round, even in summer, as the area can see sudden showers. Layers work well: a fleece for spring and autumn, and a light jumper for summer evenings. In winter, a warm coat, hat, and sturdy shoes are essential for staying comfortable on wet ground. Those checking bbc weather carmarthen or accuweather carmarthen will notice the humidity can make it feel cooler than the temperature suggests.
Is Carmarthen often foggy in the morning?
Yes, because the River Towy valley traps moisture, leading to mist and fog on calm, clear nights. It usually clears by late morning. This is a key detail to note when checking the met office carmarthen weather before a drive.
When are the school holidays in Carmarthenshire?
Carmarthenshire school holidays typically run from late July to early September (summer), with a week in mid-February and two weeks at Easter. Autumn half-term is usually the last week of October. Hotel prices rise during these periods.
Does Carmarthen get snow?
Snow is infrequent, falling on average 5-10 days per year, often as a light dusting. Heavy snowfall is rare but can cause disruption on the A40 and A48. For a reliable outlook, check the carmarthen weather 14 days forecast for any cold snaps.