Heavy rain and strong winds will batter London today and sweep across the country with risk of nationwide flooding and travel disruption, the Met Office said.
Forecasters said all parts of the UK will be hit with wet weather as Storm Aiden moves in from the west - putting any coronavirus-friendly Halloween celebrations in jeopardy.
Some of the inclement conditions were caused by the remnants of ex-Hurricane Zeta, which hit the Gulf Coast of America earlier this week.
Several yellow warnings for rain – covering Northern Ireland, much of Scotland, Wales and parts of western England – came in to force from midnight.
Downpours will hit London at around midday and continue in to the early afternoon. Rain will begin again in the early hours of the morning, and wil continue throughout Sunday until the early evening.
Temperatures will be no higher than 16C throughout the weekend.
Wind gusts of up to 39 mph are predicted today in London and up to 42mph tomorrow.
Visibility is set to be good - so many Londoners will be able to see tonight’s Blue Moon.
Met Office deputy chief meteorologist Martin Young said: “As the heavy rain and strong winds from Storm Aiden sweeps eastwards on Saturday, another system quickly follows on Sunday that contains the remnants of ex-Hurricane Zeta, bringing further heavy rain and strong winds.
“Given that this is falling on already saturated ground from what has been a wet October, there is an increased risk of flooding in some warnings areas.
“We’re urging people to keep a close eye on the forecast, flood alerts and warnings in their areas.”
Predicted rainfall throughout Saturday is expected to be 20-40mm in lower-lying areas, while hilly areas could see 40-60mm, the Met Office said.
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Another yellow warning for rain covering Wales and north-west England is in force from 6pm on Sunday to 6am on Monday, and warns some communities could be cut off by fast flowing and deep floodwater.
Very strong winds could affect north-west Scotland between noon and 9pm on Sunday, including the possibilities of power cuts and delays for high-sided vehicles and public transport.