The Met Office has issued yellow weather warnings for parts of the United Kingdom on Friday and Saturday.
Heavy and persistent rain is due to fall from 6am until midnight on Friday in the north west of England, south west of Scotland and Lothian Borders, Wales and Yorkshire and Humber.
Higher ground in the south and south west could see up to 100mm by the end of the day and the rain is expected to be accompanied by strong winds, gusting up to 60mph.
Friday’s weather system has been named Storm Callum by forecasters in Ireland. The strongest winds are likely in western Ireland, though north west parts of the UK can expect severe gales.
The Met Office has warned there is a chance of homes and businesses becoming flooded and that delays and cancellations of public transport are possible. It added some communities may be cut off by flooded roads.
The rain is set to continue all day on Saturday, affecting the same areas.
The weather is typical for this time of the year and follows on from a record-breaking hot summer, of which the Met Office declared it to be the joint warmest on record, along with 2006, 2003 and 1976.