For CPUs,
30-40C is normal for an idle CPU. However, an idle system temperature of 35C is a little on the warm side. But nothing to worry about.
If a CPU reaches 80C then extra cooling support is reccomend. If it reaches above 80C then the CPU may suffer from internal damage, or harm the CPU socket.
About your voltages, they are normal and your PSU is functioning normally.
If your still worried about the temperatures of your CPU, then I would reccomend any of these options:
-More fans for your case.
-3rd party CPU cooler.
-Clean the dust from the CPU cooler and case fans.
Please ask more questions if you need any further assistance.
Hope this helps!