A flood alert has been issued for Aberdeen and Aberdeenshire.
SEPA said it not currently possible to predict exactly which areas will be affected, and some areas may miss the worst of the heavy rain.
However, if the heaviest showers fall over built-up areas or fast-responding rivers there could be flooding to low-lying land, roads and buildings and disruption to travel.
People should be aware and prepared to act. The risk is expected to decline into Saturday evening, but there is potential for further heavy showers in some areas on Sunday afternoon.