Areas in London, Scotland and Wales have all been warned of potential flooding and disruption following heavy rainfall.
The Met Office has forecast “heavy showers” for the rest of Friday, particularly in the south and east, with the wet weather hitting the northwest later on Sunday.
The Government flood forecast for the next five days reads: “Local flooding from surface water is possible across parts of the north of England, parts of central, south-west and south-east England and is possible but not expected elsewhere in England today and tomorrow.
“Land, roads and some properties may flood and there may be travel disruption.”
In Scotland the Scottish Environment Protection Agency has issued nine flood alerts and 11 flood warnings across the region.
In Wales there is a flood alert in place near Swansea.
September has so far provided a wet start to the autumn, after many areas across the country suffered from droughts over the hot summer months.
The outlook for the rest of the week predicts: “A mixture of sunny spells and showers, some heavy with hail and thunder, and slow-moving across central and eastern England.
“More persistent rain, some heavy for southeast Scotland and parts of northeast England.
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“Dry in the north Tuesday, some heavy showers in the south.”
Met Office Chief Forecaster Paul Gundersen explained the reason behind this unsettled weather, saying: “During autumn, forecasters have the added complication of trying to estimate the impacts of ex-hurricanes when they work their way into the North Atlantic.
“Although the cooler conditions outside of the tropics cause them to decay quickly, they can bring disruption to weather patterns by bringing lots of moist and relatively warm air which often becomes entrained within other home-grown weather systems.”
There are currently two successive tropical cyclones in the Atlantic that could affect our weather system.