Overview: PanajachelPanajachel (Guatemala) in general has a tropical climate. Temperatures during the day are in the range from 23 °C (74 °F) in January to 26 °C (78 °F) in April. Temperatures during the night go from 10 °C (50 °F) in January to 15 °C (58 °F) in June. The least rainy month in Panajachel is January with its 2 days of rain, the rainiest month is September, when it rains 23 days.