After a major version upgrade your firewall is still busy with background tasks post upgrade, so temperatures can be expected to be elevated post upgrade for a while as the firewall finishes those tasks. Unless the chassis itself is alarming I wouldn't pay any attention to this at all.
That long past the upgrade itself I wouldn't expect to see temperatures double what was previously your normal. That being said, again, your new baseline of 60 degrees itself isn't alarming and is well within normal operating temperatures. I wouldn't be concerned about this temperature myself, but by all means if you feel alarmed about it I would open a TAC case and see if they can tell you why your new norm doubled. My guess would be that you won't get a great answer from TAC, because again it's within normal operating temperatures.
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