Sound velocity vs. temperature was measured in a continental shelf silt, a calcareous ooze, a deep‐sea red clay, a continental slope clay, and a quartz sand using a resonant chamber technique. The temperature effect on these water‐saturated sediments was approximately the same as for water alone; this similarity to water behavior would be expected inasmuch as the compressibility of a water‐sediment mixture is dominantly due to the relatively large water compressibility.