Overview: KallithéaKallithéa (Greece) in general has a mild climate. Temperatures during the day are in the range from 12 °C (53 °F) in January to 31 °C (88 °F) in July. Temperatures during the night go from 3 °C (38 °F) in February to 20 °C (69 °F) in July. The driest month is August with just 3 days of rain, on the contrary, the month when it rains the most is December with 7 days of rain. The highest sea temperatures in Kallithéa are in August with 26 °C (79 °F) and the lowest in February with 13 °C (56 °F).