Heavy rain and winds of up to 60 mph will hit parts of England and Scotland and could cause flooding, travel disruptions and blackouts on Saturday.
The Met Office has issued yellow weather warnings for eastern and southern England and north-eastern Scotland, over Aberdeenshire, Orkney and Shetland.
Parts of the southeast could receive 30 to 40 mm of rain over a short period of three to six hours, which could lead to surface water problems.
Parts of North East Scotland and North West England could have the same amount of rain but over a longer period.
While some coastal areas and the southeast could face winds of 50 to 60 mph, inland areas can expect gusts of 40 to 50 mph later on Saturday. There is also a chance of 70 mph winds in the Shetlands.
Road, rail, air and ferry services and high-sided vehicles on exposed roads and bridges can be affected by strong winds, and strong waves and spray are expected in coastal areas.
The Met Office said the strong winds would be enough to cause transport delays and a short loss of power.
He added: “Certainly for the North East of Scotland the winds are stronger, there is a better chance that branches will come loose from the trees. If people have things in the garden, pieces will be blown off, but not enough to cause real structural damage.
“With these wind forces, a lot of leaves will be washed away by the trees and it is possible to block drains and cause flooding.
“Some houses and roads could be affected. “
Sunday will be brighter for most of the UK with a few spots of sunshine, although heavy rain will continue throughout the day. However, a yellow wind warning is in place for the Shetlands.
Becky Mitchell, meteorologist at the Met Office, said: “[On Sunday] this large area of heavy rain is moving into the North Sea, so it appears that the sunshine is much better across the country.
“It will be a windy day with temperatures up to 17 ° C and it will certainly be a little warmer tomorrow due to the additional sunshine. But the winds will not be as strong. The forecast is for sunny periods and the weather will be. much drier in most areas, but there will be very heavy showers mainly in the west. ”
Next week, the forecast calls for volatile conditions again, with England and Wales likely to see another period of wet and windy weather on Monday evening and Tuesday morning.