Two days before landfall, the Pacaya volcano, roughly 25 mi south of Guatemala City, erupted on May 27, killing one person and forcing over 2,000 people to evacuate, and causing the temporary closing of the main international airport. Excessive rainfall from Agatha in the region could exacerbate the situation and trigger lahars. However, people working in coffee fields considered the rain brought by the storm to be helpful, removing ash from their trees. According to meteorologists in Guatemala, at least 14 in of rain had fallen by the evening of May 29.]Several landslides blocked roadways across southern areas of the country, hindering traffic. Following the storm, a three-story building was swallowed by a 30-meter diametresinkhole caused by Agatha's rainfall.
In the town of Almolonga, department of Quetzaltenango, a mudslide triggered by the storm killed four people after destroying their home, and in total twelve people were killed in Guatemala, while another landslide left 11 people missing. Officials in the country declared a state of emergency during the afternoon of May 29 as conditions worsened. Many rivers in the country were already swollen and close to over-topping their banks. Many other homes were destroyed in widespread floods and dozens of emergency rescues had to be made.In a press report, President Álvaro Colom stated that, "We believe Agatha could wreak more damage in the country than Hurricane Mitch and Hurricane Stan". These storms were two of the most devastating tropical cyclones to impact the country, killing 384 and 1,513 people respectively.
By the afternoon of May 30, reports from the region stated that 15 people had been killed and 22 others were missing throughout Guatemala. Preliminary damage assessments showed that at least 3,500 homes were damaged. A total of 112,000 people were evacuated. Additionally, at least 20,000 people have been left homeless as a result of the storm. Some areas recorded the heaviest rainfall in over 60 years, measuring more than 36 in. This also ranks Agatha as the wettest known tropical cyclone to ever strike the country, surpassing Hurricane Mitch.By the next day, the death toll had risen to 92, with another 95 people injured.
