Temperatures are set to climb this weekend in the UK, with warm, humid air bringing a taste of late summer.
Some areas of England and Wales could even experience highs of up to 26C on Monday (September 14).
Plenty of rain is also expected to be in the mix over the next couple of days.
However, does this actually meet the threshold to count as being a heatwave in the UK?
Will there be a heatwave in the UK?
Forecasters say the warm spell will be short-lived and does not meet the criteria for a heatwave.
While some parts of the country could see highs of up to 26C on Monday, temperatures are expected to dip again by midweek.
"It will feel warm and muggy - especially where there are sunny spells - although heavy rain also features in the forecast," BBC Weather shares.
"The warmth will persist into Monday in many areas, but nowhere is expected to reach heatwave criteria and cooler conditions are due to return by midweek."
A heatwave requires three consecutive days above a regional temperature threshold.
This can vary from 28C in London to 25C in Scotland and Northern Ireland.
Forecasts for the weekend show a southeast-northwest split, with southern England staying warmest and driest.
Rain is expected to spread south during Saturday (September 12), lingering in northern England, Wales, and the Midlands, while Scotland and Northern Ireland will see clearing conditions.
The rain could turn heavy at times, with a risk of thunder and lightning and brisk south-westerly winds.
By contrast, southern parts of England are forecast to remain mostly dry with sunny intervals and humid air pushing temperatures into the mid-20s Celsius.
On Sunday (September 13), rain may persist in southern England for part of the day but is expected to clear, leaving a dry afternoon for much of the UK.
Highs of 23–25C are possible in Wales, the Midlands, and southern England.
Monday looks to be the warmest day, with 22–26C likely in England and Wales, and around 20C in parts of Scotland and Northern Ireland.
Is there hot weather in the long-range forecast?
BBC Weather's computer models currently suggest unsettled weather will continue over the next week or so.
The jet stream is expected to bring areas of low pressure across the UK, meaning spells of rain and, potentially, some rather blustery winds.
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Later in the month, areas of high pressure may have more influence on the weather, which would mean longer dry interludes and the chance of above-average daytime temperatures.
BBC Weather adds: "While long-range forecasting is fraught with uncertainty and details are subject to change, there is currently nothing to indicate that a heatwave is on the cards.
"Indeed, as autumn advances and the nights become longer, high pressure overhead could lead to some rather chilly mornings."
Would you want to see some warmer weather in the UK this month? Let us know in the comments.
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