Devon and Cornwall has been graced with glorious spells of sunshine in recent weeks.
The region has seen temperatures in the low and mid 20s throughout September, but that is set to change this week, with highs of 13C.
The Met Office has warned some areas will see a drop of around 10C, as well as more wind and rain as the jet stream arrives in the south of England.
Met Office meteorologist Aidan McGivern said: “Big changes with the UK weather this week – we’re going to go from late summer kind of weather to much more autumnal conditions.
“We lose the warmth and it turns much cooler – and we’ll see mixture of rain and showers from the second half of the week.
“Additionally, by the weekend, some places could experience their first frosts of the season.
“It’s all to do with the jet stream, which is often the case.
“The jet stream at the moment is well to the north of the UK, carrying areas of low pressure away from the British Isles, leaving us with a ridge of high pressure and plenty of warm sunshine and temperatures typically in the low to mid 20s.
“On Thursday, we’re going to see a significant change, with multiple areas of low pressure close to the UK – and temperatures 10 degrees lower, with the jet stream driving to the south of the country.”
Plymouth will start the week dry, with temperatures of 17C.
By Wednesday, heavy showers are forecast and temperatures of 15C predicted.
Temperatures will continue to decrease to 13C on Friday and Saturday, with rain also forecast.
Highs of 18C are predicted in Exeter on Monday and highs of 17C on Tuesday, with both days set to be dry.
The rest of the week, until Saturday, is predicted to see rain.
There will be highs of 13C on both Friday and Saturday.
Torbay will start the week with highs of 18C and will see heavy downpours on Wednesday, with highs of 16C.
Temperatures will drop to 13C on Friday and Saturday.
Barnstaple will start the week with temperatures of 17C and 16C.
On Wednesday, heavy rain is forecast with highs of 16C.
By the weekend, Barnstaple will see highs of 13C.
Truro is set to start the week off dry with highs of 17C.
By Thursday, temperatures will drop to highs of 14C with light showers.
The rain will continue into the weekend with highs of 13C.
The Met Office predicts Penzance will start the week dry, with highs of 17C.
By Friday, temperatures will drop to 13C.
Newquay will begin the week cloudy but dry with highs of 16C.
By Wednesday, the rain will hit and continue into the weekend, with highs of 13C.
South West England weather forecast
After a cold start today, it will be fine with plenty of sunny spells. Winds easing throughout the day, though staying breezy in coastal areas. Feeling generally cool but pleasant in the sunshine. Maximum temperature 16 °C.
Largely clear skies tonight but with some cloud and a chance of rain in the west. Another cold night with frost possible in rural areas. Minimum temperature 2 °C.
Cloudy on Monday, though with some sunny spells possible in the morning. Outbreaks of light rain are likely but it will generally be warmer and less windy than the weekend. Maximum temperature 18 °C.
Outlook for Tuesday to Thursday
Mostly dry with sunny spells on Tuesday. Turning increasingly unsettled and windy from Wednesday with rain, sometimes heavy, moving in. Similar on Thursday, with only brief dry interludes.
UK long range weather forecast
October 1 – October 10
An unsettled period, with plenty of showers and some occasional longer spells of rain across much of the country. Some drier and brighter spells are possible at times, which will most likely in southern and eastern areas. The heaviest and most prolonged spells of rain will be in the north and west to begin with but, with time, they are likely to become more widespread across the UK.
It will be generally windy, with a risk of gales at times (potentially severe), particularly in northern and northwestern regions. Feeling cold through much of early October, especially where there is persistent rain and strong winds. Frost is possible at night in any calmer period, especially in northern Britain.