S4C ·

Twt

Monday 26 October 2026, 06:20 – 06:30 UK time

Mae dwr yr harbwr wedi troi'n wyrdd dros nos. Tybed beth yw e a sut y gwnaiff yr Harbwr Feistr cael gwared ohono? The harbour water has turned green overnight. What is causing this?

Upcoming showings

Other scheduled episodes, repeats and reruns across all channels. All times are UK time.

S4C

Twt

Wednesday 21 October 2026, 06:20 – 06:30

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S4C

Twt

Friday 23 October 2026, 06:15 – 06:30

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S4C

Twt

Monday 26 October 2026, 10:20 – 10:30

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