Onshore winds are directing low cloud across the Newcastle area, keeping the skies overcast for this weekend’s Supercar races.

The cloud may produce some misty light rain at times — particularly this evening and on Sunday morning.

Conditions should be suitable for spectators to remain outside for extended periods of time, as the low cloud acts to reduce the intensity of strong late-November sunshine.

Temperatures will not climb too high or drop too low due to the cloud, with the mercury generally remaining in the high-teens and low-20's.

However, there is the potential for thunderstorms over the Hunter reaching the coast both this afternoon and Sunday afternoon, which could interrupt proceedings.