B767-300 FLT CREW DIVERTS DUE TO WX; FUEL BECOMES CRITICAL; DECLARES EMER AND LANDS.

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CLRED ON ARR ZZZZ1. WX BELOW MINIMUMS AT ZZZZ1. STARTED HOLD WITH 27K LBS. HELD WAITING FOR VISIBILITY TO IMPROVE TO MINIMUMS. WX FOR ZZZZ AT 6000M AT TIME OF DIVERT FUEL 16K+ ALERTED DISPATCH OF DIVERT. FUEL FOR DIVERT AS FIGURED BY DISPATCH 4000 LBS AND 39 MINS FOR FLT TO ZZZZ. CLRED TO ARR AT ZZZZ TOLD TO SLOW DUE TO OTHER INBOUNDS; FL370. ON ARR ALL IS WELL; BUT VISIBILITY IS RAPIDLY DROPPING TO 1500M FOR RWY 15. RWY 10 CAT II ILS IS INOP. RWY 15 STILL WELL ABOVE MINIMUMS. SLOWED BACK TO 190 KTS DUE TO FOLLOWING ACR Y; ALSO A DIVERT. GIVEN VECTORS OFF OF ARR BY ATC. COMS BTWN ACR Y AND ATC VERY BAD DUE TO DIFFERENT ACCENTS AND UNDERSTANDING OF WHAT EACH WANTS. FUEL NOW BELOW 10K. ALL SHOULD HAVE BEEN VERY EASY; EXCEPT FOR ACR Y. RELAYED NEED FOR APCH TO ATC; ADVISED WX NOW BELOW MINIMUMS. ALL OCCURRED IN LESS THAN 45 MINS. ADVISED ATC OF NEED FOR APCH. ATC BUSY WITH ACR Y. TOLD ATC TO HOLD AND CLB TO 8000 FT. HAD VISUAL CONDITIONS OF WHAT ZZZZ WAS DOING. TOLD ATC; 'UNABLE AND DECLARING EMER DUE TO FUEL.' ATC ASKS FOR OUR AND ACR Y'S FUEL ENDURANCE. ATC GETS BUSY WITH ACR Y AGAIN. WE TELL ATC 'MAYDAY; MAYDAY; MAYDAY; STARTING APCH FOR RWY 15 ILS CLRED FOR ILS TO RWY 15.' BREAK OUT JUST ABOVE MINIMUMS AND VISIBILITY 800-1000M. ADVISE TWR OF WX; ACR Y LANDS AFTER US. TAXI TO GATE.