If you are experiencing again the same situation could you please provide a screenshot of the closest METAR station report in MSFS (in that case KSFO) ?, to check if maybe it is due to this existing bug in SU13 (fixed in SU14B):
If you are experiencing again the same situation could you please provide a screenshot of the closest METAR station report in MSFS (in that case KSFO) ?, to check if maybe it is due to this existing bug in SU13 (fixed in SU14B):