ACR PLT RPTS POOR ATIS RECEPTION BETWEEN JNU AND SIT RESULTS IN INADEQUATE TIME TO PROPERLY PLAN FOR AND PREPARE APCHES.

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I JUST WANT TO RPT A LACK OF COVERAGE OF ATIS COVERAGE BETWEEN JNU AND SIT. WE HAD THE SAME PROBLEM TWO WEEKS IN A ROW. WE TAKE OFF FROM JNU WITH WX APPROX ONE HOUR OLD. DURING THIS SHORT FLT WITH ALL THE COCKPIT DUTIES; IN ADDITION TO AN RNP DEP AND APCH; I SPENT A CONSIDERABLE AMOUNT OF TIME TRYING TO GET ATIS. BY THE TIME WE WERE 30 MILES FROM SIT ALL I WAS ABLE TO GET WAS; 'INFO -- 4 - SET -- 5 -- BKN ---?KTS ---.' TOTALLY WORTHLESS. I FINALLY ASKED CTR; HE JUST GAVE ME THE SAME OLD STUFF I GOT FROM JNU. WE WERE FLYING THE RNP APCH TO RWY 11. ONCE WE CHKED IN WITH SIT RADIO ON 123.6; HE RPTED THE WIND OUT OF THE WEST AT 13 KTS. IN THE MIDDLE OF THE APCH; WE HAD TO COORDINATE WITH SIT RADIO TO BE RE CLRED FOR THE RNP TO RWY 29; A LOT OF EXTRA WORK ON SUCH A SHORT FLT. I WOULD NOT BE WRITING THIS EXCEPT THE SAME THING HAPPENED ON THE SAME FLT THE WEEK PRIOR. I DON'T KNOW IF THIS IS A TERRAIN PROBLEM OR POSSIBLY A HARDWARE PROBLEM WITH FSS; BUT IT WOULD BE NICE TO GET THE CURRENT WX IN A TIMELY MANNER BECAUSE THE WX SEEMS TO CHANGE RAPIDLY THIS TIME OF YEAR.