VFR IN IMC. PLT OF A BEECH C90 FLEW INTO THE OVCST AT 300 FT AGL DURING A VFR CLB AFTER TKOF ON THE DOWNWIND LEG AT AN UNCTLED ARPT.

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TRYING TO DEPART MARINA ARPT ON AUG/XA/00 IN A KING AIR A90 VFR ONLY ACFT AT XA30; I DELAYED THE DEP UNTIL AC10 DUE TO LOW CLOUDS/FOG ON THE DEP END OF RWY 29. THE WX; HOWEVER; WAS CLR FROM MIDFIELD EASTWARD. NONETHELESS; A DOWNWIND DEP WAS NOT ACCEPTABLE. THE WX IMPROVED TO THE NW OF THE RWY WHERE A R DOWNWIND DEP IS AUTH. HOWEVER; UPON DEPARTING; I FOUND MYSELF GETTING INTO THE LOW CLOUDS ON MY DOWNWIND LEG; WHERE I DECIDED TO LEVEL THE WINGS AND CLB ABOVE THE CLOUDS (APPROX 4 SECONDS OF IMC). AT THE TIME; THIS OPTION WAS BETTER THAN TO LOWER THE NOSE AND REMAIN CLR OF CLOUDS PER FAR REG; AND POSSIBLY JEOPARDIZE THE SAFETY OF THE FLT BY CFIT. THUS; I CLBED OUT. IN RETROSPECT; I SHOULD HAVE DELAYED MY DEP EVEN FURTHER. HOWEVER; PRESSURE TO CONDUCT THE FLT; ALBEIT HIDDEN; WAS PRESENTLY FELT WITHIN ME. A VERY GOOD FRIEND WANTED TO PERFORM THE FLT ASAP; BUT IN NO WAY WANTED TO BREAK THE REGS. A SHORT TIME LATER; IT SHOWED IMPROVEMENTS; SO I OPTED TO ACCEPT THE FLT ONLY TO FIND SECOND THOUGHTS AT THE RWY; BUT I CONTINUED.