We set out to visit Lord Jagannath with my son Prithvi and wife Geeta, last week.
From weather point of view, summer is not right time. It is too hot and humid. Do not visit four to six weeks before rath yatra since lord Jagannath wont give darshan in Idol form. You can still visit temple, go to garbha gudi and take darshan of representative idols. Only after Rath yatra is good time.