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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.
Days of Hot Weather in Columbia. The hottest days at Columbia are into the 100s Fahrenheit. A few days of really hot weather usually show up in each of June, July and August. One-hundred degree temperatures are also possible in May or September. But those months do not see extreme heat every year.