What is the reason for the high summer temperatures in the Tarim Basin and which area in the Pearl River Delta has the highest temperatures?

The temperature in the Tarim Basin in summer is higher than that in the Pearl River Delta.

The height of the sun at noon in Tarim may be smaller than that in the Pearl River Delta, but the days are longer, and the solar radiation intensity is not significantly different from that in the Pearl River Delta. The Tarim Basin has an arid climate with mostly sunny weather. The atmosphere weakens solar radiation less, and the solar radiation reaching the ground is large and the temperature is high. The Pearl River Delta region experiences cloudy and rainy weather in summer. Clouds weaken solar radiation greatly, resulting in less solar radiation reaching the ground and lower temperatures.