Here's more.
"Working with satellite data, scientists measured that surface temperatures in cities were sometimes up to 10-15°C higher than in their rural surroundings. The study also estimated that the temperature in extreme heat islands in cities around the world has risen on average by 1°C in since 2003."
https://joint-research-centre.ec.europa.eu/jrc-news-and-updates/cities-are-often-10-15-degc-hotter-their-rural-surroundings-2022-07-25_en