Lower Snake River Temperature Report for September 2025  
Generated 2025-10-01 13:18:07

  Anatone - Snake River Near Anatone (ANQW) Lower Granite Dam forebay (LWG) Lower Granite tailwater - Snake R. below dam (LGNW) Little Goose Dam forebay (LGSA) Little Goose Dam tailwater (Snake R. below Little Goose) (LGSW) Lower Monumental Dam forebay on Snake River (LMNA) Lower Monumental tailwater below the dam on Snake River (LMNW) Ice Harbor Dam forebay (IHRA) Ice Harbor tailwater- Snake R. below Goose Is. (IDSW)
Date Min Avg Max >68.05 Min Avg Max >68.05 Min Avg Max >68.05 Min Avg Max >68.05 Min Avg Max >68.05 Min Avg Max >68.05 Min Avg Max >68.05 Min Avg Max >68.05 Min Avg Max >68.05
09 01 73.7 74.4 75.3 24/24 68.2 69.3 70.0 24/24 65.7 66.5 67.8 0/24 68.8 69.2 69.9 24/24 68.6 69.0 69.3 24/24 69.3 69.6 69.8 24/24 69.2 69.7 69.9 24/24 70.6 70.9 71.3 24/24 70.8 71.3 71.7 24/24
09 02 74.1 74.7 75.6 24/24 68.4 69.1 69.5 17/17 65.6 66.5 67.3 0/24 68.6 69.1 69.7 24/24 68.5 68.9 69.2 24/24 69.5 69.7 70.0 24/24 69.3 69.8 70.0 24/24 70.7 71.0 71.5 24/24 70.8 71.3 71.9 24/24
09 03 74.0 74.9 75.9 24/24 68.2 68.9 69.9 24/24 65.9 66.3 67.6 0/24 68.6 69.0 69.7 24/24 68.4 68.9 69.5 24/24 69.6 69.7 69.9 24/24 69.5 69.8 70.1 24/24 70.8 71.0 71.1 24/24 70.8 71.3 72.0 24/24
09 04 73.8 74.4 74.9 24/24 68.4 69.3 69.9 24/24 65.7 66.4 67.6 0/24 68.8 69.2 69.5 24/24 68.5 68.8 69.2 24/24 69.6 69.7 69.9 24/24 69.5 69.8 70.2 24/24 70.9 71.1 71.5 24/24 70.9 71.3 72.0 24/24
09 05 73.5 74.1 74.6 24/24 69.6 70.2 70.8 24/24 65.9 66.9 68.3 2/24 68.5 69.0 69.9 24/24 68.4 68.8 69.0 24/24 69.5 69.7 69.8 24/24 69.4 69.8 70.1 24/24 71.0 71.1 71.2 24/24 70.9 71.4 71.9 24/24
09 06 73.2 73.7 74.1 24/24 69.8 70.6 71.6 24/24 66.3 67.4 68.8 3/24 68.4 69.0 69.5 24/24 68.5 68.8 69.1 24/24 69.4 69.6 69.7 24/24 69.5 69.8 70.1 24/24 70.9 71.1 71.2 24/24 71.0 71.3 71.6 24/24
09 07 72.5 73.1 73.8 24/24 70.8 71.1 71.7 24/24 67.0 67.6 68.9 3/24 68.2 68.7 69.4 24/24 68.4 68.7 68.9 24/24 69.2 69.4 69.6 24/24 69.6 69.7 69.9 24/24 70.9 71.0 71.2 24/24 71.0 71.3 71.8 24/24
09 08 72.6 73.2 74.2 24/24 70.6 71.0 71.2 24/24 67.2 67.6 68.8 3/24 68.1 69.0 70.0 24/24 68.1 68.5 68.9 24/24 69.1 69.2 69.5 24/24 69.2 69.5 69.8 24/24 70.7 70.9 71.1 24/24 70.7 71.0 71.4 24/24
09 09 72.8 73.3 73.9 24/24 69.8 70.4 71.3 24/24 67.1 67.4 68.4 2/24 68.0 68.5 70.1 22/24 68.2 68.5 68.9 24/24 69.0 69.2 69.5 24/24 69.2 69.5 69.7 24/24 70.5 70.7 70.9 23/23 70.9 71.1 71.4 24/24
09 10 72.3 72.7 73.3 24/24 69.2 69.8 70.3 24/24 66.6 67.1 68.1 1/24 67.9 68.5 69.4 22/24 67.9 68.2 68.5 21/24 69.0 69.2 69.4 24/24 69.1 69.4 69.6 24/24 70.4 70.5 70.7 24/24 70.6 70.8 71.2 24/24
09 11 71.8 72.6 73.8 24/24 69.5 70.0 70.6 24/24 66.8 67.4 68.7 4/24 68.4 68.9 69.6 24/24 68.0 68.4 68.7 19/24 68.9 69.2 69.4 24/24 69.0 69.3 69.6 24/24 70.2 70.4 70.6 24/24 70.5 70.7 71.3 24/24
09 12 72.1 72.7 73.7 24/24 68.0 69.9 70.4 23/24 66.7 67.2 68.3 4/24 68.7 69.0 69.4 24/24 68.1 68.5 68.7 24/24 69.0 69.2 69.3 24/24 69.0 69.3 69.5 24/24 70.2 70.3 70.6 24/24 70.2 70.5 70.9 24/24
09 13 71.9 72.7 73.7 24/24 70.0 70.3 70.9 24/24 66.5 67.3 68.4 4/24 68.9 69.4 70.5 24/24 68.3 68.8 69.3 24/24 69.2 69.8 70.2 24/24 69.1 69.4 69.8 24/24 70.2 70.7 71.0 24/24 70.2 70.7 71.4 24/24
09 14 71.3 71.9 72.5 24/24 69.3 70.2 70.8 24/24 66.8 67.5 68.5 3/24 68.3 68.8 69.5 24/24 68.1 68.5 68.8 24/24 68.8 69.2 70.1 24/24 69.0 69.2 69.4 24/24 70.1 70.3 70.5 24/24 70.1 70.4 70.6 24/24
09 15 70.2 70.7 71.2 24/24 69.1 69.6 70.1 24/24 67.0 67.6 68.3 2/24 68.1 68.5 69.4 24/24 67.8 68.2 68.5 14/24 68.9 69.0 69.6 24/24 68.7 68.9 69.2 24/24 70.2 70.3 70.5 24/24 69.9 70.2 70.7 24/24
09 16 69.3 70.2 71.2 24/24 70.0 70.7 71.4 24/24 67.6 68.3 68.7 18/24 69.3 69.7 70.3 24/24 68.6 69.3 69.8 24/24 69.5 69.5 69.7 24/24 69.1 69.5 69.8 24/24 70.2 70.3 70.5 24/24 70.1 70.4 70.8 24/24
09 17 70.0 70.2 70.4 11/11 69.8 70.5 71.0 24/24 67.7 68.5 69.0 19/24 69.8 70.0 70.7 24/24 69.5 69.7 70.1 24/24 69.5 69.6 69.8 24/24 69.3 69.5 69.7 24/24 69.8 70.0 70.2 24/24 69.9 70.1 70.6 24/24
09 18 --- --- --- 0/0 69.5 69.9 70.3 24/24 67.8 68.3 68.7 17/24 69.3 69.7 69.9 24/24 68.9 69.2 69.6 24/24 68.9 69.1 69.5 24/24 68.8 69.1 69.3 24/24 69.5 69.6 69.9 24/24 69.6 69.9 70.4 24/24
09 19 --- --- --- 0/0 68.9 69.2 69.7 24/24 67.6 67.9 68.4 8/24 68.8 69.2 69.5 24/24 68.5 68.7 69.0 24/24 68.6 68.9 69.2 24/24 68.4 68.8 69.0 24/24 69.1 69.3 69.5 24/24 69.3 69.6 70.1 24/24
09 20 --- --- --- 0/0 68.4 68.7 68.9 24/24 67.4 67.7 68.1 2/24 68.2 68.9 69.4 24/24 68.3 68.5 68.9 24/24 69.1 69.3 69.4 24/24 68.4 68.9 69.3 24/24 69.1 69.2 69.8 24/24 69.0 69.4 70.0 24/24
09 21 --- --- --- 0/0 68.3 68.5 68.8 24/24 67.3 67.5 67.9 0/24 67.8 68.1 68.6 14/24 67.6 67.9 68.3 4/24 68.9 69.1 69.3 24/24 68.5 68.7 68.8 24/24 69.0 69.2 69.4 24/24 69.0 69.1 69.3 24/24
09 22 --- --- --- 0/0 68.3 68.5 68.9 24/24 67.2 67.5 67.9 0/24 68.1 68.3 68.7 24/24 67.5 68.0 68.5 13/24 68.9 69.0 69.2 24/24 68.5 68.8 69.1 24/24 69.2 69.2 69.4 24/24 68.8 69.2 69.7 24/24
09 23 --- --- --- 0/0 68.6 69.2 69.7 24/24 67.7 68.2 68.6 14/24 68.6 68.6 68.8 24/24 68.2 68.5 68.9 24/24 68.9 69.0 69.0 24/24 68.5 68.9 69.3 23/23 69.3 69.4 69.5 24/24 69.0 69.3 69.9 24/24
09 24 --- --- --- 0/0 69.4 69.6 69.7 11/11 68.2 68.4 68.5 24/24 68.5 68.6 69.1 24/24 68.2 68.5 68.8 24/24 68.9 69.0 69.1 24/24 68.6 68.9 69.3 24/24 69.2 69.3 69.4 24/24 69.0 69.4 69.9 24/24
09 25 --- --- --- 0/0 --- --- --- 0/0 68.0 68.3 68.7 19/24 68.5 68.6 68.9 24/24 68.3 68.5 68.9 24/24 68.8 69.0 69.1 24/24 68.3 68.8 69.2 24/24 69.0 69.2 69.4 24/24 68.9 69.3 69.9 24/24
09 26 --- --- --- 0/0 --- --- --- 0/0 67.7 68.0 68.2 6/24 68.3 68.3 68.5 24/24 67.9 68.2 68.5 22/24 68.2 68.4 68.7 24/24 67.8 68.1 68.3 19/24 68.6 68.8 69.0 24/24 68.4 68.8 69.3 24/24
09 27 --- --- --- 0/0 --- --- --- 0/0 67.9 68.2 68.3 18/24 68.0 68.1 68.4 19/24 67.9 68.1 68.3 12/24 68.0 68.1 68.3 9/24 67.7 67.9 68.2 5/24 68.4 68.4 68.6 24/24 68.2 68.5 69.0 24/24
09 28 --- --- --- 0/0 --- --- --- 0/0 67.8 68.0 68.1 2/24 67.9 68.0 68.1 4/24 67.8 68.0 68.3 7/24 67.9 67.9 68.0 0/24 67.6 67.8 68.1 1/24 68.2 68.3 68.4 24/24 68.1 68.4 68.9 24/24
09 29 --- --- --- 0/0 --- --- --- 0/0 67.2 67.5 67.7 0/24 67.7 67.8 67.9 0/24 67.6 67.8 67.9 0/24 67.7 67.8 67.9 0/24 67.4 67.6 67.8 0/24 68.1 68.2 68.2 12/12 67.9 68.2 68.4 19/24
09 30 --- --- --- 0/0 --- --- --- 0/0 67.0 67.2 67.3 0/24 67.6 67.8 68.3 5/24 67.4 67.6 67.9 0/24 67.5 67.6 67.7 0/24 67.2 67.5 67.7 0/24 --- --- --- 0/0 67.7 68.4 75.0 14/24
>68.05 17 17 17 395/
395
23 24 24 555/
556
1 7 22 178/
720
23 27 29 638/
720
20 25 28 592/
720
26 27 27 633/
720
25 26 28 624/
719
29 29 29 683/
683
28 30 30 705/
720

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.