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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Regional Report 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 from Penarth — conditions can shift quickly as weather moves in from the Bristol Channel, so the latest data is your best guide.
What is the weather in Penarth tomorrow?
Tomorrow’s outlook depends on the live forecast you see above, but Penarth largely follows patterns set by the wider Severn Estuary.
- Morning sea fog can linger into the afternoon, especially in late spring and autumn.
- Winds strengthen from the south-west, often bringing rain within a few hours.
- Temperatures typically sit 1–2°C cooler than inland spots like Cardiff.
What about the longer outlook — weather in Penarth 10 days and beyond?
For a reliable picture use the live forecast above, but longer-range models for Penarth often struggle past seven days because of local sea-breeze effects.
- Check the 10 day weather forecast UK for a broader view.
- The Met Office updates their three-hourly outlook four times a day — this is more reliable than a single synoptic chart.
- If you see “21 day weather forecast Penarth” online, treat it as a trend indication, not a precise prediction.
How accurate is BBC Weather Penarth for the next 14 days?
The BBC’s 14-day forecast uses the Met Office global model. It is reliable for general trends (warmer/cooler, wetter/drier) but day-to-day details shift quickly. Always cross-check the live forecast above for the coming 72 hours.
Is AccuWeather Penarth more precise than the Met Office?
AccuWeather uses a different proprietary model. For Penarth’s location, the Met Office integrates local coastal effects better. For short-term decisions (morning walk, boat trip), use the live forecast above which comes from authoritative UK data.
Does the weather in Penarth usually match BBC Weather Cardiff?
Often yes, but Penarth is more exposed to sea breezes. In summer, Cardiff can be 2°C warmer inland; in winter, Penarth may stay milder under maritime cloud. Always check Bristol Weather for the opposite side of the channel.
Sources
For other UK locations, see our UK weather hub or compare with Glasgow Weather.