Mid and Upper-Columbia River Temperature Report for May 2026  
Generated 2026-06-01 13:18:10

  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 50.4 50.8 51.2 0/24 49.6 50.0 50.3 0/24
05 19 51.0 51.4 52.6 0/24 50.1 50.9 51.6 0/24
05 20 51.5 52.0 52.5 0/24 51.5 52.1 52.4 0/24
05 21 51.9 52.3 53.1 0/24 52.1 52.3 52.6 0/24
05 22 52.0 52.4 52.9 0/24 52.2 52.4 52.7 0/24
05 23 52.0 52.4 53.0 0/24 52.3 52.6 53.0 0/24
05 24 52.7 53.0 53.3 0/24 52.7 53.0 53.4 0/24
05 25 53.3 53.5 53.7 0/24 53.2 53.6 53.9 0/24
05 26 53.0 53.3 53.7 0/24 53.1 53.4 53.6 0/24
05 27 53.0 53.4 53.9 0/24 53.1 53.5 53.9 0/24
05 28 53.5 53.9 54.3 0/24 53.6 53.9 54.0 0/24
05 29 53.6 53.9 54.5 0/24 54.0 54.1 54.4 0/24
05 30 54.2 54.6 55.2 0/24 54.3 54.6 55.0 0/24
05 31 54.6 55.0 55.3 0/24 54.6 54.9 55.2 0/24
>68.05 0 0 0 0/
742
0 0 0 0/
744

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.