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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Playlister UK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above before heading out in Hirwaun – the village sits in a valley cleft in the South Wales coalfield, so conditions can shift quickly as cloud spills over the surrounding hillsides.
What should I expect from today’s weather in Hirwaun?
The live forecast above gives the most up-to-date picture, but Hirwaun’s local microclimate often brings its own quirks. The Brecon Beacons to the north funnel moisture, making drizzle and low cloud more persistent than in nearby towns.
- Rainfall tends to be frequent but light – around 150 wet days a year, many with just a few millimetres.
- Winds are usually moderate, funnelling along the Cynon Valley, but can gust strongly when a depression tracks across the Irish Sea.
- Temperatures rarely stray far from the South Wales average, though frost lingers later in spring because of the valley’s cold-air pooling.
How does Hirwaun’s weather compare with the rest of Wales?
Because of its inland, upland position, Hirwaun is often a few degrees cooler than coastal places like Swansea, and it sees more cloud. That said, the village can be surprisingly sheltered when the wind is from the south-west.
- Summer highs typically reach 19–21 °C, a degree or two below the Welsh average.
- Winter frosts are more frequent than in Cardiff, with around 40–50 ground frosts per season.
- Snowfall is occasional – the A465 Heads of the Valleys road can get a dusting when higher ground further north sees significant cover.
Is Hirwaun prone to fog?
Yes. The valley location traps moisture, especially on calm autumn and winter nights. Hill fog can form quickly, reducing visibility to less than 100 m on the A465. Check local travel updates before commuting.
Which forecast service is best for Hirwaun weather?
The Met Office provides a dedicated forecast for Hirwaun, while BBC Weather covers the wider Rhondda Cynon Taf area. AccuWeather Hirwaun also offers hourly trends. For the most reliable data, refer to the live forecast above.
What’s the weather in Hirwaun tomorrow likely to be?
For the most accurate “weather in Hirwaun tomorrow” outlook, always check the live forecast above. In general, expect similar conditions to today, though overnight lows can dip a couple of degrees if skies clear.
Sources
For a wider outlook, see our UK weather hub or check the 10 Day Weather Forecast UK for other regions.