Which weather temperature is higher in Guangzhou or Nanning?

It must be Nanning.

1. Nanning is a bit southerly in latitude

2. Offshore Guangzhou, the temperature concentration effect is not big and it is relatively cooler.

3. Nanning is located inland, and geographically, it happens to be in a basin, so heat dissipation is not ideal.

In short, Nanning is indeed a relatively hot city.