Overview: TacnaTacna (Peru) in general has a tropical climate. Temperatures during the day are in the range from 20 °C (67 °F) in July to 27 °C (81 °F) in February. Temperatures during the night go from 9 °C (49 °F) in July to 17 °C (62 °F) in January. The least rainy month in Tacna is May with its 0 days of rain, the rainiest month is February, when it rains 1 day.