While the Young Farmers saw the warmest annual convention weekend in a long time, experts at Farmers Weather say that may be it for the warm weather, for now.
Temperatures this weekend reached the highest recorded in May since 2012.
Dr Simon Keeling said: "After the warmth of the weekend this week is going to be one of contrasts.
"Rain in the southern half of the UK is likely to be rather showery and sometimes thundery, and there will be a noticeable easterly breeze too.
"However, Scotland, Northern Ireland and probably the far north of England should be drier with the best sunshine in Scotland.
"Cool on eastern coasts of England and Scotland, warmer elsewhere but not as warm as recent days.
"Then the end of the week brings about a significant change.
"The northerly wind will be pushing colder air southwards through the whole of the country so that by Friday and the weekend, temperatures will be around 9C in northern Scotland, 14C in southern England.
"Just a few showers by then on eastern coasts, but dry in the west.
"However, get set for a risk of frost, yes frost at the weekend."