The Civil Protection Directorate of El Salvador evacuated residents in Tecoluca after setting up 1,152 shelters across the country. The Autonomous Executive Port Commission thought of closing the El Salvador International Airport due to Eta. The Executive Hydroelectric Commission of the Lempa River cleared pipes to make sure flooding doesn’t happen in communities along the river.
Costa Rica's National Meteorological Institute forecast lots of rainfall because of the outer bands of Eta, mostly along the Pacific coastline. With flooding starting at the night of November 2, the National Emergency Commission (NCE) put up multiple shelters for people leaving. The agency planned to set up three types of shelters due to the COVID-19 pandemic: infected people, people who might be infected, and non-infected persons. Landslides were expected in many areas due to wet soils.
Although not in the path of Eta, the hurricane was expected to cause damage in Panama. Machines alerted to dangerous swells in Caribbean waters, along with wind gusts up to . The Ministry of Public Works (MOP) told residents to stay alert for possible flooding and landslides. MPO road crews were sent to make sure highways remained clear for travel.
As flooding was a major threat because of heavy rainfall, a flood warning was issued for all of Belize because of Eta, as the National Emergency Management Organization (NEMO) urged residents to evacuate.
Once the Cayman Islands came close to the cone of Tropical Depression Eta on November 5, tropical storm watches were issued for Grand Cayman and all of the other islands. This came after Eta became forecast to become a tropical storm again before brushing by the islands. Government schools were closed in the islands on November 6 due to the threat of Eta. The next day, tropical storm warnings were put into effect for all of the islands.
On November 6, the Government of Cuba issued a tropical storm watch for many provinces of the western provinces of Cuba. Later that day, these were upgraded to tropical storm warnings in some provinces.
Late on November 6, tropical storm watches were issued for the northwestern Bahamas. The next day, these watches were upgraded to tropical storm warnings.
On November 6, tropical storm watches were issued for the Florida Keys and parts of the coast of the Florida Peninsula. The next day, these were upgraded to tropical storm warnings in the Florida Keys and the southern tip of the peninsula. On November 7, Hurricane Watches and Warnings were issued parallelly for much of the Florida peninsula and both Tropical Storm Warnings and Watches were extended further north. Residents of small homes and other structures in the Florida Keys were told to evacuate ahead of Tropical Storm Eta as a state of emergency was declared in some counties including Monroe and Miami-Dade. Later, Hurricane Warnings were issued for the Florida Keys. All the warnings for Florida were cancelled by November 9, only to have more issued the next day along the western side of the state as Eta changed directions.
Eta's intensity at the beginning of its lifetime followed by its odd path afterwards bought devastating impacts across Central America, the Greater Antilles, the Bahamas, and Florida with heavy rainfall, strong winds, and flash flooding causing most of the damage.
Despite passing north of the archipelago of San Andrés, Providencia and Santa Catalina, Eta still brought some damage to the island. Wind speeds of cut down the trees and damaged houses, and Eta also caused severe flooding on the island. Damage across the archipelago reached COL$3 billion (US$777,000). Across the archipelago, two people were injured and 141 families were affected. A total of 6 homes were destroyed while another 64 homes and 24 businesses had damage.
As Eta neared landfall, its winds downed power lines and trees while causing flooding and damaging roofs in Puerto Cabezas. At the Getsemani School, where 215 people were waiting out the storm, Eta's strong winds ripped 10 sheets of metal off the school's roof. No one was injured in the incident. The Wawa River that connects Puerto Cabezas to the rest of Nicaragua had too much water in its banks. Two people in the municipality of Bonanza died after they were buried in a landslide while working in a mine. Eta caused C$6.128 billion (US$178.4 million) of damage in Nicaragua.
Hurricane Eta had life-changing effects on Honduras, largely due to flooding. Flooding caused 559 residents to get out oftheir homes and two others had to be rescued. At least 457 homes were damaged by floodwaters, 41 communities were cut off by washed-out roads, and at least nine bridges were destroyed including one in La Ceiba. In La Ceiba, floodwaters rushed through streets, and the flooding also washed away a structure at a local cemetery. A ferry leaving Roatán was rocked by large waves and winds with 300 passengers onboard while trying to reach the port of La Ceiba. Nobody was injured on the ferry. The Permanent Contingency Commission of Honduras said that 14 roads and 339 homes were destroyed. In Olanchito, 12 people, including two newborns, were trapped. A wall collapsed at a prison in El Progreso letting in waist-deep floodwaters, causing the evacuation of more than 600 inmates. At least 74 people have been killed across Honduras as a result of Eta, mainly due to landslides and drownings. Among the dead were at least four people, including three children, who were killed in the mountains outside the north coast city of Tela due to different landslides. In Santa Barbara, a 2-year-old girl was killed when she and her mother were swept away by floodwaters; the mother survived. Four members of the same family died in the municipality of Gualala due to heavy rains. A 13-year-old girl was killed when mud and rain caused her home to collapse in the village of Carmen. In Sulaco, a 15-year-old boy drowned while trying to cross a river that was full due to rain. A 37-year-old man also drowned in San Manuel, in the western part of the Lempira Department. Total economic losses in Honduras are estimated to be over 125 billion lempiras (US$5 billion).
According to the country's president, Alejandro Giammattei, at least 60% of the eastern city of Puerto Barrios was flooded with another 48 hours of rain expected. About 100 homes were damaged by flooding and landslides. A bridge crossing the Río Grande de Zacapa in Jocotán was washed away. At least 53 people died across Guatemala, while an additional 96 remain missing. An estimated 343,000 people were directly affected by the storm. The village of Queja near San Cristobal Verapaz in the center of the country was very hard-hit, with a landslide burying 150 homes. Over 100 people were buried from the landslide, and rescuers began searching them on November 9. However, the searching was called off two days later. Infrastructural damage were amounted to be exceed Q3 billion (US$386 million).
Heavy rainfall affected much of El Salvador as Eta passed to the northeast. Rainfall got over a total of with a maximum of in the La Unión Department. A total of 107 communities had power outages. Across the nation, 1,991 people required evacuation because of floods and landslides. Even with a ban on fishing activities, one fisherman drowned off the coast of Playa El Espino in the Usulután Department.
The outer bands of Hurricane Eta brought heavy rainfall to portions of Costa Rica. The heaviest rains were mostly along the nation's Pacific coast, especially in Guanacaste Province. Many reports of flooding and landslides happened nationwide, 12 rivers saw higher levels, making questions of more flooding, and 26 people had to evacuate in Corredores and Parrita. In southern Costa Rica, a landslide on a house killed two people, a Costa Rican woman and an American man. Damage while the storm was alive in the nation was almost ₡10 billion (US$16.5 million).