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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Public Report weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Based on the live forecast above, plan for changeable conditions in Ystradgynlais today – a mix of cloud and occasional drizzle, with temperatures near the seasonal norm for the Swansea Valley.
What does the live forecast show for Ystradgynlais right now?
The live forecast above gives current temperature, wind speed and rain probability. Ystradgynlais sits in the upper Swansea Valley at around 200 metres elevation, often leading to cooler mornings and persistent low cloud compared to lower-lying areas. Expect the day to start overcast with possible light rain moving in from the west. For a detailed outlook, the Met Office weather for Ystradgynlais offers hourly breakdowns and longer-range trends.
How does Ystradgynlais weather compare with neighbouring towns?
The valley location makes Ystradgynlais generally wetter than Swansea, as moist Atlantic air rises over the Brecon Beacons. Rainfall here averages 1,400–1,600 mm per year, significantly higher than the UK average of 1,150 mm. Frosts are common in winter, and snow occasionally settles on higher ground. BBC News often covers local weather events when severe conditions affect the region.
Does Ystradgynlais get snow?
Yes, especially on higher ground around the Brecon Beacons. The valley can see 5–10 days of lying snow per year, typically between December and February. Heavy falls are rare but can disrupt local roads.
Is Ystradgynlais often foggy?
Valley mist is common in autumn and winter, caused by damp air cooling overnight. Visibility can drop below 100 metres in the early morning, usually clearing by midday. It is most frequent from October to January.
What is the best time to visit for dry weather?
Late spring (May–June) and early autumn (September) typically have the highest chance of settled, dry days. July and August can be showery, while winter is wettest and darkest.
For more regional forecasts, visit our UK weather hub or check the 10 Day Weather Forecast UK for extended outlooks.