Looking at the metars for the past 24 hours, the winds were light and southerly. It's more likely the Rwy 9 approach was due to low visibility;
San Diego Runway Use program
San Diego Lindbergh Field shall normally use runway 27 for departures and arrivals unless the wind is out of the east at 10 knots or greater, at which time runway 9 shall be the active runway, regardless of visibility.
If the reported ceiling drops below 700' and/or the visibility decreases below 2 statute miles, then San Diego shall use runway 9 for arrivals and departures.
If the reported ceiling drops below 300' and/or the visibility below 1 statute mile, San Diego will use runway 9 for arrivals and runway 27 for departures. During this situation, arrivals and departures will both occur west of the field, and delays should be expected. When required, SAN APP should advise CTR of any needed flow restrictions.