Santiago Atitlán Weather in September
September in Santiago Atitlán brings high temperatures, with highs of 25°C (77°F) and nights dropping to 17°C (63°F). It's the rainiest month of the year, so come prepared with waterproof gear.
Rainfall in Santiago Atitlán in September
As part of the rainy season, Santiago Atitlán sees around 25 days of rain in September, with an average of 457 mm (18 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.
Temperature in Santiago Atitlán in September
In September, expect high temperatures in Santiago Atitlán, with highs of 25°C (77°F) and lows of 17°C (63°F) at night. This kind of day-to-night contrast is typical for this time of year. At 17°C (63°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Santiago Atitlán in September
The area enjoys a balanced 155 hours of sunlight, ensuring it's neither too rainy nor too sunny.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Santiago Atitlán. Our weather planner can help you explore destinations with more pleasant weather conditions.
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 Santiago Atitlán's climate page.
Santiago Atitlán Temperature in September
Min Temperature
17°C (63°F)
Max Temperature
25°C (77°F)
Chance of Rain
82%
Precipitation
457 mm (18 in)
Rainy days
25 days
Humidity
81% *
Sunshine
155 hours *
Percentage Sunshine
*
Daily Historical Temperatures
40-year average (1976-2025)
Based on our historical records, temperatures in Santiago Atitlán typically stay consistent throughout September, with daily highs averaging around 25°C (77°F). Nights are pleasant, with lows around 15°C (59°F).
Average temperatures in September
Historical weather for Santiago Atitlán in September
Browse day-by-day weather records for Santiago Atitlán spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Santiago Atitlán historical weather extremes in September
Based on weather observations in Santiago Atitlán between 2002 and 2025, these are the recorded extremes during September.
- The hottest September day on record in Santiago Atitlán reached 32°C (90°F) (September 1, 2025).
- Santiago Atitlán experienced its chilliest September day on September 3, 2010, reaching only 19°C (66°F).
- Santiago Atitlán registered its coldest September night on September 18, 2012, with temperatures dropping to 9°C (48°F).
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
pleasant
tolerable
unpleasant
poor
What to Wear in Santiago Atitlán in September
For Santiago Atitlán in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Santiago Atitlán 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 Santiago Atitlán's climate page.
Temperature Rainfall Sunshine Humidity
See the full Santiago Atitlán climate overview or explore weather in Guatemala.
