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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Media Grid UK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Based on the live forecast above, Treharris sees its highest temperatures during the afternoon, with values staying within the seasonal range for this part of the Taff Valley. Overnight, skies remain largely cloudy and temperatures drop steadily. This points to a typical autumn day where a jacket will be useful, especially after sunset.
What is the outlook for Treharris over the coming days?
The live forecast shows a pattern of changeable conditions across the week. Daytime highs are expected to peak in the mid-range for November, with overnight lows falling to around the average for the valley. Rain is likely at times, with the heaviest showers arriving midweek. For a full picture, see the 10 Day Weather Forecast UK.
How does the Taff Valley shape Treharris weather?
Treharris sits in a narrow section of the Taff Valley, which means fog and low cloud can linger longer than on higher ground, especially during calm, cool spells. The surrounding hills also create a rain-shadow effect at times, though frontal systems moving in from the Atlantic still bring frequent wet weather. Winds are generally light to moderate, funnelled by the valley sides.
What does the Met Office say for Treharris?
The met office treharris forecast typically aligns with the live forecast above, though the Met Office provides additional detail on hourly rainfall and wind gusts. Check their site for the latest warnings, especially if you are planning outdoor activities in the valley.
Is there a 14-day weather forecast for Treharris available?
A 14 day weather for treharris outlook is available from long-range forecast providers. Reliability decreases beyond day seven, but the general trend — often mild and unsettled for the Taff Valley — can be useful for forward planning. The live forecast above gives the most accurate short-term view.
How does Treharris weather compare with Cardiff or Bristol?
Treharris, being inland and in a valley, is often cooler and cloudier than coastal Cardiff and Bristol Weather. Overnight lows can be several degrees lower, and fog is more common. Rainfall totals are generally similar, though local topography can enhance showers.