Overview: Byron BayByron Bay (Australia) is a place with a tropical climate. Temperatures during the day are in the range from 20 °C (68 °F) in July to 28 °C (83 °F) in January. The highest sea temperatures in Byron Bay are in February with 26 °C (79 °F) and the lowest in August with 21 °C (69 °F). The driest month is September with just 7 days of rain, on the contrary, the month when it rains the most is March with 16 days of rain. Temperatures during the night go from 10 °C (50 °F) in August to 20 °C (69 °F) in February.