While many people enjoyed the sunshine over the weekend, for some it proved too much as the East of England Ambulance Service Trust (EEAST) dealt with a variety of 999 calls as a result of the high temperatures.
EEAST received eight calls as a result of potential heat exposure across Hertfordshire on Saturday and Sunday, compared to just one call received throughout the whole of May up until the weekend.
A EEAST spokesman said: "When the weather changes, we can also see a change in 999 calls, and that was certainly the case this weekend.
"A man in his 60s suffered from dizziness and vominting, which we believe could have been as a result of sunstroke, and had to be taken to Watford General Hospital for further treatment.
"Even though it's only May, the sun can be really strong so we'd advise people to take precaution when out and about during the nicer weather.
"Ensure you drink plenty of water, wear suncream, and stay in the shade if you feel you are getting warm. It's particularly important that vulnerable people such as the elderly and the very young are protected properly from the heat."