Tue Jul 10 05:10:06 EDT 2018 Lost River/Pahsimeroi- Including the cities of Arco, Challis, and Mackay 309 AM MDT Tue Jul 10 2018 .TODAY...Sunny, breezy. Highs 82 to 92. .TONIGHT...Clear, cooler. Lows 49 to 56. .WEDNESDAY...Sunny. Highs 80 to 90. .WEDNESDAY NIGHT...Clear. Lows 49 to 56. .THURSDAY...Sunny. Highs 82 to 92. .THURSDAY NIGHT AND FRIDAY...Clear. Lows 51 to 58. Highs 83 to 93. .FRIDAY NIGHT...Mostly clear. Lows 54 to 61. .SATURDAY AND SATURDAY NIGHT...Partly cloudy. Highs 81 to 91. Lows 51 to 61. .SUNDAY THROUGH MONDAY...Mostly clear. Highs 78 to 88. Lows 49 to 58.