Guatemala has three main regions: the cool highland which has the highest population, the tropical area along the Pacific and Caribbean coasts, and the tropical jungle in the northern lowlands. Guatemala's neighboring countries are Mexico on the north and west, and Belize, Honduras, and El Salvador on the east. During this time of the year they have rain and thunderstorms. The best time to visit is November-April. During those months there is less rain. In the summer it's cooler in the mountains, and hot and humid in the lowlands (especially on the Pacific coast). When you visit you should take a sweater and long-sleeved shirt for the evenings and a jacket for Guatemala City. In September, when tropical storms move in from the Caribbean, it can rain for days on end.