Rainy weather is expected to clear during the course of Sarturday as a ridge of high pressure spreads up from the south-west.
Dramatic views of the eclipse, at its height from 10.24pm to 11.58pm, are promised almost everywhere in England, Wales, Scotland and Northern Ireland.
A spokesman for MeteoGroup UK, the weather division of the Press Association, said: "Any cloud that's hanging around during the day should be melting away towards the evening.
"Large tracts of England and Wales will have no cloud at all by midnight. Conditions are perfect for a lunar eclipse, and I'd advise people to get outside with their binoculars."
This year's lunar eclipse will be visible from the UK, Europe and Africa.
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i've only got a crappy kodak 2 magapix, i'll take tinas 5 magapix out tonight, that means i have to take tina out too