Cuilco, Guatemala's climate is characterized by mild temperatures year-round, with minimal seasonal variation. Daytime highs can reach up to 36°C in March and August, while nighttime lows dip to around 3°C in January and February. The temperature averages remain relatively consistent throughout the year, hovering around 20°C, except for a slight drop in December and November. The warmest months are typically from May to October, with temperatures gradually decreasing towards the end of the year.