Detailed inshore surface sea temperatures have not previously been available for the tropical Queensland coast. Recordings were made in Cleveland Bay (19� 15'S., 146� 50'E.) for four separate 1 year periods. A total of 212 readings is available. The maximum monthly mean temperature is 31.2� C in January and the minimum monthly mean is 21.8� C in July. The relationship between sea and air temperatures is discussed. The present data are compared with other available information.