September in Retalhuleu averages 30°C (86°F) during the day and 22°C (72°F) at night. It is the wettest month of the year, with 517 mm (20 in) of rainfall on average, so waterproof gear is a must.
September in Retalhuleu can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
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Pick a month to see the average temperature, rainfall and sunshine in Retalhuleu - and find the best time to visit.
49-year average (1976-2025)
Based on our historical records, temperatures in Retalhuleu typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 22°C (72°F).
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Retalhuleu spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
According to our 24 years of weather records for Retalhuleu, the following extremes were recorded between 2002 and 2026.
Find out more about the weather in Guatemala and which places have the best travel conditions in this month. See all of Guatemala in September →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Bring sunglasses since you'll have some sunny periods throughout the month
Temperature Rainfall Sunshine Humidity
See the full Retalhuleu climate overview or explore weather in Guatemala.
Where to go in September - average daytime high across popular destinations.
Flores
34°C (93°F) Rio Dulce Town32°C (90°F) Lívingston32°C (90°F) Cobán27°C (81°F) Guatemala City27°C (81°F) Antigua Guatemala25°C (77°F) Quetzaltenango22°C (72°F) Panajachel23°C (73°F) Need travel inspiration? Check out our bucket list articles and be inspired.
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