Nowhere does it mention weather
Not directly, but as soon as you enter cloud, you are no longer "rated" on the aircraft (by virtue of not holding an IR) and therefore cannot log PIC.
Its the same as a ME student, not being able to log PIC during their training, as they are not "rated" to fly a ME aircraft.
Its different with say a Complex endorsement, where you are already rated to fly a SEL aircraft, so during a complex sign off you can actually log PIC even before you're signed off.
Its all words, but its something an examiner would pick up when scrutinizing your logbook during the oral
