Here are the corrected sentences:

1. The temperature in Dubai is higher **than** in London.
2. The hottest temperatures in the world are usually in deserts. (Remove "the" before "hottest")
3. Singapore is not **as sunny as** Australia.
4. It is best to live in a sunny city **rather than** a rainy city.
5. Too much sun can be more dangerous than too much snow. (Remove "the" before "more")
6. A tornado is **more** dangerous than a storm. (Change "worse" to "more dangerous")
7. In Antarctica, May is as cold as August. (Change "cold" to "as cold as")
8. The Atacama Desert in Chile is one of the driest places in the world. (Change "of" to "in")