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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 ·
The live forecast above shows Treharris currently at around 10°C with a moderate south-westerly wind, producing a feels-like temperature of 7°C — a standard mild March day for this South Wales Valleys town.
What will the temperature be in Treharris over the next few days?
The pattern remains unsettled: daytime highs will hover between 9°C and 12°C through the week, with overnight lows dropping to 4–6°C. Rain is most likely on Wednesday and Friday, with drier intervals on Thursday. The Met Office Treharris outlook indicates a gradual trend toward slightly colder conditions by next weekend.
What are the main weather risks for Treharris this week?
Wind gusts could reach 35 mph on Tuesday and again on Friday, particularly on higher ground to the north of the town. No flood warnings are currently issued for the local Taff Bargoed area, but localised surface water on roads is possible during heavy showers. If you plan to be outdoors, the best window appears to be Thursday afternoon.
What is the Met Office forecast for Treharris?
The Met Office for Treharris shows a low-pressure system dominating this week, with cloud and showers on most days. Their 3-hourly breakdown helps you plan around the wettest spells, especially between midday and 4pm.
How reliable is the 14 day weather for Treharris?
The 14 day weather for Treharris gives a general trend rather than exact timings. Confidence drops significantly after day 7, but the overall pattern of cool, showery conditions is likely to persist into early April.
Is Treharris prone to flooding in heavy rain?
The town lies in the Taff Bargoed valley, which can see localised standing water during sustained downpours. The main flood risk is from the Nant Caeach, but current forecasts show no immediate danger.
For the wider picture, see our UK weather hub and 10 Day Weather Forecast UK.