Mid and Upper-Columbia River Temperature Report for May 2026  
Generated 2026-05-18 04:27:06

  Chief Joseph Dam forebay (CHJ) Chief Joseph tailwater (CHQW)
Date Min Avg Max >68.05 Min Avg Max >68.05
05 01 47.3 47.7 48.2 0/23 47.6 47.8 48.1 0/24
05 02 47.5 47.9 48.5 0/23 47.7 48.0 48.4 0/24
05 03 47.8 48.2 48.8 0/24 48.0 48.3 48.5 0/24
05 04 48.1 48.5 49.1 0/24 48.3 48.5 48.8 0/24
05 05 48.3 48.5 48.7 0/24 48.5 48.6 48.8 0/24
05 06 48.2 48.6 49.3 0/24 48.5 48.7 49.3 0/24
05 07 48.4 48.9 49.7 0/24 48.4 48.6 49.0 0/24
05 08 49.4 49.8 50.2 0/24 48.7 49.0 49.3 0/24
05 09 49.7 50.0 50.2 0/24 49.1 49.4 49.7 0/24
05 10 49.4 49.6 50.0 0/24 49.0 49.1 49.4 0/24
05 11 49.9 50.1 50.4 0/24 49.1 49.5 49.7 0/24
05 12 49.5 50.1 50.9 0/24 49.0 49.4 50.1 0/24
05 13 49.8 50.2 50.7 0/24 49.5 49.8 50.1 0/24
05 14 49.7 50.1 50.5 0/24 49.3 49.6 50.0 0/24
05 15 50.2 50.4 50.6 0/24 49.8 50.0 50.2 0/24
05 16 49.9 50.0 50.2 0/24 49.3 49.5 49.8 0/24
05 17 49.7 50.1 50.7 0/24 49.3 49.5 49.7 0/24
05 18 50.5 50.6 50.7 0/5 49.6 49.7 49.8 0/4
05 19 --- --- --- 0/0 --- --- --- 0/0
05 20 --- --- --- 0/0 --- --- --- 0/0
05 21 --- --- --- 0/0 --- --- --- 0/0
05 22 --- --- --- 0/0 --- --- --- 0/0
05 23 --- --- --- 0/0 --- --- --- 0/0
05 24 --- --- --- 0/0 --- --- --- 0/0
05 25 --- --- --- 0/0 --- --- --- 0/0
05 26 --- --- --- 0/0 --- --- --- 0/0
05 27 --- --- --- 0/0 --- --- --- 0/0
05 28 --- --- --- 0/0 --- --- --- 0/0
05 29 --- --- --- 0/0 --- --- --- 0/0
05 30 --- --- --- 0/0 --- --- --- 0/0
05 31 --- --- --- 0/0 --- --- --- 0/0
>68.05 0 0 0 0/
411		 0 0 0 0/
412

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.