Nepal Rastra Bank sets the currency exchange rate daily. The Exchange rate is updated and it changes daily. NRB sets all exchange rate for dollar- USD, AUD, SGD, GBP, INR.
Advantages of knowing exchange rate daily
If you are abroad, you can send money when the exchange rate is higher. You will get the higher amount in Nepal. If your family members are in abroad, you can ask them to send money when the exchange rate is higher. It will be a great benefit for you.