SMT PLT MAKING VISUAL APCH TO 34C AT SEA MISTAKES TXWY T FOR THE RWY.

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I WAS CLRED FOR A VISUAL APCH TO RWY 34C. ATIS WAS 17 MINS OLD: WIND 350 DEGS AT 6 KTS; VISIBILITY 6 MI IN LIGHT RAIN; 18 OVCST; 23 SCATTERED; 49 SCATTERED; TEMP/DEWPOINT 8 DEGS/3 DEGS; ALTIMETER 30.13. THE BROADCAST DID NOT INCLUDE A HVY RAIN SHOWER THAT HAD MOVED OVER THE ARPT WITH AIRPLANES RPTING AIRSPD VARIATIONS OF 10 KTS ON SHORT FINAL. I TURNED FINAL ABOUT 5 MI OUT; AND WAS STAYING HIGH TO AVOID THE WAKE OF A HEAVIER AIRPLANE IN FRONT OF ME. I WAS ALSO KEEPING MY SPD HIGH DUE TO THE WINDSHEAR RPTS. DUE TO THE HIGH/FAST APCH; I REQUESTED A LONG LNDG AND WAS CLRED TO ROLL OUT TO TXWY F NEAR THE DEP END OF RWY 34C. THE VISUAL OBSCURATION OF THE WINDSHIELD AND WET ARPT SURFACES CAUSED BY THE RAIN SHOWER REDUCED THE RWY-IDENTING VISUAL CUES; AND THE HIGH/FAST APCH ALTERED MY SIGHT PICTURE. I WAS FOCUSING FAR DOWN THE RWY NEAR THE TXWY F TURNOFF; LOOKING OUT THE WINDSHIELD TO JUDGE MY VISUAL GLIDE PATH; SO I MISSED THE ILS DISPLAY BEING OFF CTR. (THE GS WAS FULL FLY-DOWN DUE TO THE HIGH APCH; SO I WAS PARTIALLY IGNORING IT ANYWAY.) MY 'VISUAL APCH BACKED-UP BY THE ILS' WASN'T REALLY AS 'BACKED UP' AS I HAD INTENDED. A WIND SHIFT PASSING INTO THE RAIN SHOWER WAS ALSO A POSSIBILITY; AND IF I HAD REALLY BEEN BACKING UP THE VISUAL APCH WITH THE ILS BY AT LEAST KEEPING THE NEEDLES ON THE SCALE; I WOULD PROBABLY HAVE SEEN THE DRIFT OFF OF RWY 34C SINCE THE VISUAL CUES OUT THE WINDSHIELD WERE OBSCURED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER ADVISED HE WAS APPROX 50 FEET AGL WHEN THE TOWER ADVISED HE WAS OVER TXWY T VICE 34C. HE PERFORMED A GAR FROM THAT POINT AND RETURNED FOR LANDING ON 34C.