PLT OF A PIPER AZTEC 250 APCHED AND LANDED WHEN THE OFFICIAL ARPT WX RPT INDICATED BELOW VFR CONDITIONS.

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I RECEIVED A FLT SVC WX BRIEFING FOR A 20 MI VFR FLT FROM SBY TO GED FOR SCHEDULED MAINT. THE WX WASN'T FORECAST TO GET SIGNIFICANTLY WORSE THROUGHOUT THE DAY. I ARRIVED AT THE ARPT APPROX 15 MINS LATER; GND CTL ADVISED THAT WX AT SBY HAD BEEN RECENTLY AMENDED TO 10 MI BROKEN 4 MI. I DEPARTED SBY VFR AND IMMEDIATELY TUNED IN GED ASOS AND FOUND THAT THEIR WX WAS STILL VFR. APPROX 10 MI FROM GED; I HAD TO TURN AROUND WITH A TSTM IN MY PATH. I CALLED SBY AND INQUIRED IF THE ARPT WAS STILL VFR AND WAS TOLD THAT THEY CURRENTLY WERE. I GAVE MY INTENTIONS AND THE REASON FOR MY RETURN AND WAS GIVEN LNDG INSTRUCTIONS. WHILE LISTENING TO THE RADIO; I HEARD THE CTLR REQUEST A PIREP FROM ANOTHER ACFT. THIS ACFT WAS IFR AND ON THE APCH. THE PLT OF THIS OTHER ACFT RPTED THE BASES AT 500 FT. I RPTED WHEN ON THE DOWNWIND FOR THE GIVEN RWY AS REQUESTED AND WAS CLRED TO LAND. ON ROLLOUT THE TWR INFORMED ME THAT THE FIELD WAS OFFICIALLY IFR. THE WX NEAR THE COAST IS OFTEN VERY VOLATILE AND APPARENTLY IMPOSSIBLE TO PREDICT IN SOME CASES. IN THE FUTURE I WILL LEAVE MYSELF A GREATER MARGIN.