Retalhuleu Weather in September
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.
Rainfall in Retalhuleu in September
As part of the rainy season, Retalhuleu sees around 21 days of rain in September, with an average of 517 mm (20 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours, often in the late afternoon.
Temperature in Retalhuleu in September
In September, Retalhuleu sees high temperatures, with highs of 30°C (86°F). Nights drop to around 22°C (72°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 22°C (72°F), evenings stay pleasantly warm.
Sunshine in Retalhuleu in September
You can expect a moderate amount of sunlight, with approximately 155 hours. Even though this month is part of the wet season, you can still see the sun occasionally.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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Guatemala, check out our Retalhuleu's climate page.
Retalhuleu Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
30°C (86°F)
Chance of Rain
71%
Precipitation
517 mm (20 in)
Rainy days
21 days
Humidity
81% *
Sunshine
155 hours *
Percentage Sunshine
*
Daily Historical Temperatures
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).
Average temperatures in September
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Retalhuleu in September
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.
Retalhuleu historical weather extremes in September
According to our 23 years of weather records for Retalhuleu, the following extremes were recorded between 2002 and 2025.
- The hottest September day on record in Retalhuleu reached 37°C (99°F) (September 15, 2009).
- Retalhuleu experienced its chilliest September day on September 4, 2010, reaching only 25°C (77°F).
- The lowest overnight temperature recorded in September was 12°C (54°F) (September 10, 2025).
- The wettest September day on record brought 191 mm (7.5 in) of precipitation to Retalhuleu (September 4, 2010).
Best Places in Guatemala in September
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
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tolerable
unpleasant
poor
What to Wear in Retalhuleu in September
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 monthWhat To Do in Retalhuleu in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Guatemala, check out our Retalhuleu's climate page.
Temperature Rainfall Sunshine Humidity
See the full Retalhuleu climate overview or explore weather in Guatemala.
