B737 FIRST OFFICER REPORTS BEING DISPATCHED TO SAN WITH NO ALTERNATE. FOG ROLLS IN AND FLIGHT DIVERTS TO ONT; LANDING WITH 3000 POUNDS OF FUEL.

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PLANNED ARR FUEL AT SAN WAS 5000 FT WITH NO ALTERNATE REQUIRED. SAN WAS 7 MI; 16/14 DEGS CELSIUS; CALM WINDS. APPROX 1/2 WAY TO SAN; DISPATCH SENT AN ACARS MESSAGE SAYING; 'THE FOG IS COMING IN OFF OF THE WATER; PEDAL FASTER.' IF WE COULDN'T LAND AT SAN WE WERE TO GO TO ONT. WE GOT TO SAN AND COULD SEE MOST OF THE ARPT WHILE ON DOWNWIND TO RWY 27. THE FOG HAD ALREADY STARTED COVERING THE RWY. AT 8 MI; THE TWR CALLED TOUCHDOWN RVR 6000 FT AND ROLLOUT 1400 FT. AT 3 MI; TWR CALLED TOUCHDOWN RVR 1400 FT AND ROLLOUT 1400 FT. AT 1000 FT THE RWY WAS NO LONGER VISIBLE; SO WE EXECUTED A GAR. WE HAD APPROX 4800-5000 LBS OF FUEL. WE DECIDED NOT TO TRY ANOTHER APCH BECAUSE OF THE FOG SITUATION AND GOT VECTORS TOWARD ONT. WE CLBED TO 11000 FT MSL; CONTACTED THE FLT ATTENDANTS; MADE AN ANNOUNCEMENT TO THE PAX; RAN CHKLISTS; GOT THE WX FOR ONT; WORKED THE RWY DATA; CONTACTED ONT OPS; AND COORDINATED WITH DISPATCH THROUGH ACARS. SOMEWHERE IN THERE; DECLARING MINIMUM FUEL WAS OVERLOOKED. IT WAS A BEAUTIFUL DAY IN ONT AND WE HAD THE ARPT IN SIGHT FOR MANY MILES. SOMEWHERE ON SHORT FINAL; IT LOOKED LIKE WE MIGHT LAND WITH LESS THAN 3000 LBS. GOING TO SAN AT THAT TIME OF THE MORNING WITH THE DEWPOINT SPREAD THAT CLOSE SHOULD HAVE RAISED AN EYEBROW. BUT WITH THE WX PACKAGE; EVERYTHING ELSE LOOKED GOOD. CALLING DISPATCH TO QUERY THE LACK OF AN ALTERNATE AND TO DISCUSS THE CURRENT AND ARR TIME WX WOULD HAVE BEEN VERY HELPFUL. WHEN WE ARRIVED AT ONT WE WERE TOLD THAT 7 FLTS HAD DIVERTED FROM SAN THE DAY PRIOR. THAT WOULD HAVE BEEN A NICE NOTE ON THE WX PACKAGE.