SMA LANDS AND DEPARTS WITHOUT CLRNC AT PREVIOUSLY NON TWR ARPT.

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CALLED FOR FULL BRIEFING INCLUDING NOTAMS. WENT TO FBO FOR FUEL AND TO PAY. DID PREFLT AND LISTENED TO AWOS. ANNOUNCED INTENTIONS ON 123.0 AS IN PAST. TAXIED TO ACTIVE (POSTED IN FBO); DID RUNUP; ANNOUNCED TAKING ACTIVE AFTER OBSERVING NO TFC; AND TOOK OFF. DID STANDARD L-HAND PATTERN AND DEPARTED PATTERN ON DOWNWIND AT MIDFIELD. CALLED APCH CTL AT BEAUFORT MARINE (AS USUAL); GOT FLT FOLLOWING; AND PROCEEDED TO DEST. WHILE ENRTE; HEARD DEP TELL ANOTHER INBOUND ACFT TO CONTACT HILTON HEAD TWR. THIS WAS MY FIRST INDICATION THAT A TWR WAS IN OP AT WHAT IS NORMALLY AN UNCTLED FIELD. PROCEEDED TO DEST AND CHKED WITH FSS AND SPECIFICALLY REQUESTED IF 49J HAD A NOTAM FOR TEMPORARY TWR AND WAS TOLD THAT IT DID. I DID ALL THE NORMAL PROC THAT I FOLLOW IN FLYING IN AND OUT OF 49J; AND NEVER HAD ANY IDEA THE TEMPORARY TWR WAS IN OP. FSS ON ORIGINAL CALL NEVER MENTIONED THE TWR EVEN THOUGH THEY GAVE ME NOTAMS ALONG RTE AND AT DEST. FBO DID NOT SAY ANYTHING AND THERE WAS NO NOTICE POSTED THAT I SAW. NOTHING ON AWOS AND DEP DID NOT MENTION IT. TO MY KNOWLEDGE; THE ONLY WAY I COULD HAVE AVOIDED THIS WOULD HAVE BEEN TO HAVE FILED IFR AND GOTTEN CLRNC ON GND; BUT; SINCE DAY WAS NICE; I PROBABLY WOULD HAVE PICKED UP CLRNC IN THE AIR ANYWAY.