Cool ! I have always wanted to visit Rishikesh again !
There are direct trains and buses but no direct flights for this journey. New Delhi (Delhi) to Rishikesh (Uttarakhand) distance is 229 km and you can get there by cab in just over 4 hours and 28 minutes or by train fares starting from ₹ 170.
The weather at Rishikesh is varying from "nice" to "hotter than nice".