The temperature in Nottingham was higher than in Rio de Janeiro as England cricketers made history.
The mercury rose to 26C at 2pm on Saturday making it 3C higher than in Brazil.
The news comes after a weather warning was issued for the county.
The Met Office issued the yellow warning for the rest of the day and has also forecast the possibility of localised showers which could lead to surface water flooding.
The Chief Forecaster's assessment states that temperatures hitting the mid-twenties throughout the morning and early afternoon make it likely to bring showers and thunderstorms, with a risk of 20 to30mm of rain falling in an hour in some places.
Some cricket fans at Tent Bridge have struggled to cope with the heat.
David Smith, 39, from London, said: "I've been coming to the Trent Bridge test since 2003 and this is without doubt the hottest I have known it.
"Fortunately I have the factor 30 with me because there is no respite from the baking heat."
However, the heat is nothing new according to Chris Harrison.
The 45-year-old, from Astwood Bank, Worcestershire, said: "We all come once a year.
"It was just as hot last year in the One Day International against New Zealand. It's so friendly here. We love the atmosphere and the ground."
Despite the heat Joe Root and Jimmy Anderson put on a world-record stand of 198 for the last wicket to take England to a highly unlikely first-innings lead against India.
Ian Bowen, 46, of Wells in Somerset, said; "The sport here at Trent Bridge is better than Rio.
"It is good to see England breaking records for the right reasons."
Jonny Gutteridge, 45, of Ruddington, agreed.
He said: "We're having a great time. We've seen history being made.
"Nottingham is better that Rio in lots of ways. We love it."
The current forecast for Nottingham includes rain from 8pm to 11pm with overcast skies throughout the afternoon.
Throughout the night temperatures are expected to drop to around 17C compared to lows of 18C in Rio de Janeiro.
However, those playing in the World Cup Final will have to play through a heat of 24C.
In Nottingham, rain is predicted throughout most of Sunday with temperatures reaching highs of 19C but falling to 14C over night.
Forecasters are predicting the cooler weather will not last long with the county predicted to heat up again on Monday and despite the predicted cloud, humidity is expected to reach 64 per cent with a temperature of 22C throughout the afternoon and evening.Click here for the up to date forecasts.
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