Hertfordshire is among the areas that could be set to face a fifth heatwave of the summer.
Temperatures are once again rising, with Watford expected to face 31C heat on Monday.
The GFS weather model has now predicted that Hertfordshire is one of 11 counties that could experience an official heatwave later this month, with highs of 31C possible across much of eastern, central and southern England.
Maximum possible temperatures could reach 35C on August 12, GFS model data shows.
An official heatwave is declared when temperatures hit the ‘heatwave threshold’ three days in a row. The threshold stands at 28C in the south east, which includes Hertfordshire.
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The Met Office says temperatures could turn “very warm or hot” as we head into August, although there is also a chance of some rain.
Its forecast for the period from August 5-14 says: “A generally rather changeable period looks likely, with many places likely to see some much needed rain or showers at times but also some more sunshine. Initially, some rain or showers will affect many parts, this heavy and possibly thundery in places.
“After a drier, brighter few days, further changeable or unsettled conditions may develop as we head towards mid-August. This may be due to frontal systems moving in from the Atlantic or thundery plumes moving north from the continent or a combination of both."
So far this summer has seen just seven per cent of expected rainfall nationally and one per cent in southern England.
Hertfordshire has this week been declared to be in drought, while a hosepipe ban is also currently in place.
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