This report examines the effect of temperature up to 3 days after casting on the standard curing strength. When cured at low temperature up to 3 days of age, the standard curing strength increases, and when curing at high temperature up to 3 days, the standard curing strength is low. In the high strength concrete, the structure strength correction value will be underestimated if the early curing is in summer temperature. In hot weather concreting for general strength range, if the early curing is in summer temperature, the structure strength correction value will be underestimated by about 3N / mm2.