TODAY is expected to be one of the hottest days across Wales so far this year and workplace experts warn that employees could be less productive as a result.
The Met Office predicts temperatures will soar to 28 degrees C (82 degrees F) across many areas of the UK today as the country continues to benefit from a band of high pressure originating from northern Africa.
But workplace specialists Morgan Lovell warn that many offices are ill-equipped to handle the sudden temperature change and that productivity could fall sharply because of the current mini heatwave.
Its survey of Britain's bosses suggests that 40% of office staff feel that the temperature control in their workplace is insufficient. And more than one in 10 workers claim that temperature control is not provided for them at all.
Improving temperature control ranked as one of employers' lowest priorities when it comes to planning the workplace design, with only 13% of bosses saying they had considered it.
Staff absence from work already costs British business far more than £11bn each year according to CBI findings 2004.
But David Henderson, managing director of Morgan Lovell, believes that the under-performance of staff when at work may be of even more concern.
He said, "The physical working environment needs to be conducive to productivity.
"There are many factors which significantly affect employee productivity - the amount of light available, the amount and type of space and colour, for example, but temperature is arguably the single most important."
The hottest temperature of the year so far was 33 degrees C in central London on June 19.
Wayne Elliott of the Exeter-based Met Office, said, "Although it's not going to be the hottest day of the year, it is going to be very warm across most areas of the country.
"We have air conditioning here, although just seeing the sun can make you want to be outside."