No it's not weather or some processes in background. I have taichi x370 motherboard with latest bios. And first time in my life bios did went to default on it's own. I don't know what happened but it was totally reset. Maybe there was some critical error? And it went to default. I'm just checking Asrock forums as it's so strange...
After setting everything up in bios temps are good now. Perfectly stable at 34*C while I'm writing this post. No strange peaks with clocks and temps.