Almost two weeks' rain was expected to fall in parts of Britain overnight, forecasters said.
Pockets of northern England, Wales and Scotland could have expected up to 40mm of rain - with isolated patches of moorland high above sea level expected to get up to a high of 80mm of rain during that time.
The average rainfall for much of the country during February stands at just less than 100mm, meaning the overnight downpour would represent almost half that total in just a few hours.
Met Office forecaster Krista Mitchell said 54.6mm was recorded in Dumfries and Galloway.
The rain was not expected to compare with the sorts of rainfall which have caused havoc in parts of southern England in the last two months, where homes have been evacuated and transport networks brought to their knees as flood water surged.
Ms Mitchell said last night a band of rain was heading over England, Wales and Scotland but would fragment into the morning.
"The heaviest rainfall will be over the highest ground. People can expect 30-40mm - up to 80mm on higher ground - the average being 98mm for the month of February."
The forecaster said there would be some showers heading into the week, with strong winds, but would not compare with the conditions earlier in February.