Mid and Upper-Columbia River Temperature Report for August 2026  
Generated 2026-09-01 13:18:11

  Chief Joseph Dam forebay (CHJ) Chief Joseph tailwater (CHQW)
Date Min Avg Max >68.05 Min Avg Max >68.05
08 01 63.6 63.9 64.2 0/24 63.6 63.9 64.5 0/24
08 02 63.8 64.1 64.4 0/24 63.7 64.1 64.5 0/24
08 03 63.7 64.4 65.0 0/24 63.7 64.3 64.7 0/24
08 04 63.7 64.1 64.6 0/24 63.2 63.7 64.3 0/24
08 05 63.3 63.6 63.7 0/24 63.1 63.4 63.8 0/24
08 06 63.4 64.0 64.6 0/24 63.4 63.8 64.3 0/24
08 07 64.2 64.7 65.3 0/24 64.0 64.5 65.0 0/24
08 08 64.8 65.2 65.6 0/24 64.3 64.8 65.2 0/24
08 09 65.1 65.7 66.2 0/24 64.6 65.3 65.8 0/24
08 10 65.6 66.2 66.6 0/24 65.1 65.8 66.3 0/24
08 11 65.9 66.2 66.4 0/24 65.4 65.7 66.0 0/24
08 12 65.7 66.3 66.6 0/24 65.4 65.8 66.2 0/24
08 13 65.7 66.1 66.5 0/24 65.2 65.8 66.2 0/24
08 14 65.8 66.2 66.5 0/24 65.3 65.7 66.0 0/24
08 15 65.9 66.3 66.6 0/24 65.5 65.9 66.3 0/24
08 16 66.0 66.3 66.6 0/24 65.6 66.0 66.4 0/24
08 17 66.2 66.4 66.6 0/13 65.8 66.1 66.4 0/24
08 18 --- --- --- 0/0 65.9 66.2 66.5 0/24
08 19 --- --- --- 0/0 65.9 66.2 66.6 0/24
08 20 --- --- --- 0/0 66.0 66.5 67.1 0/24
08 21 --- --- --- 0/0 66.1 66.5 66.8 0/24
08 22 --- --- --- 0/0 66.0 66.5 67.0 0/24
08 23 --- --- --- 0/0 66.1 66.6 67.2 0/24
08 24 --- --- --- 0/0 66.6 67.0 67.2 0/24
08 25 --- --- --- 0/0 66.3 66.6 66.9 0/24
08 26 --- --- --- 0/0 65.9 66.2 66.5 0/24
08 27 --- --- --- 0/0 66.1 66.6 67.0 0/24
08 28 --- --- --- 0/0 66.3 66.8 67.2 0/24
08 29 --- --- --- 0/0 66.5 66.7 67.0 0/24
08 30 --- --- --- 0/0 66.6 67.0 67.4 0/21
08 31 --- --- --- 0/0 66.8 67.0 67.4 0/24
>68.05 0 0 0 0/
397		 0 0 0 0/
741

Temperature in Degrees Fahrenheit
<32 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 >86

Bold, red text denotes values above 68.05°F.
--- indicates No Data

NOTICE: This report is based on raw, unverified data.