Here is the context:
- Warm weather means temperatures around 25°C
- Hot weather is when temperatures are around 35°C
Then if today there is hot weather, what should we understand when one says "I wish it was warmer today" ?
I understand that he/she wishes to have temperatures around 40°C, but you could also interpret it as he/she wishes the temperatures were closer to warm weather i.e. 25°C.