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The legal limit for Columbia water temperature is 68 degrees to protect salmon and steelhead in the mainstem of the river (itâs lower in tributaries and spawning grounds). Over the past two years, Columbia Riverkeepr volunteers found 70-degree water in much of the mainstem.
Summers are hot, although humidity is low so that the heat is quite tolerable. Locals and visitors alike head for the river to cool off. Daytime temperatures typically are in the 90s (Fahrenheit) and will often spike over 100 degrees for several weeks during the summer.