may i know what will the temperature of nanjing from 25th feb to 8th mar

In the late Feb, the temperature varies from 4C to 15C and it will become a little bit colder in the early March.
For more detail and exact information, I think you can refer to https://www.travelchinaguide.com/climate/nanjing.htm. You can keep attention on this webpage to find the exact temperature several days in advance.