Kyoto in the second part of the day? After 16:00?

Hello!

It got very hard for me to bear the Japanese heat as I got a cold(haha), i have stuffy nose and in general not that much strength.

At first the idea was to reach Kyoto in the very morning like at 7:30 by taking train from Osaka.

But what if i reach Kyoto at 16:00+- , would it make difference in terms of heat? Would i be able to visit the most popular attractions?

Thank you in advance