The F1 paddock is expecting rain at the new Yeongam venue.

The F1 paddock is expecting rain at the new Yeongam venue.

After a dry inaugural race weekend in South Korea so far, forecasts are predicting rain later on Saturday and overnight, with a very high chance of more heavy showers on race-day morning.

And the threat of rain for 1500 local on Sunday - the scheduled race start - is more than 50 per cent, leaving some drivers worried about the effect of a wet track atop the new and already low-grip surface.

"It's going to be tough whatever the weather does," warned McLaren's Jenson Button.

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F1 paddock expecting race-day rain at Yeongam