SeasonMapLake Atitlán (Atitlán) weather in September
Guatemala
September in Lake Atitlán: warm, soaked, with muggy air — a gamble, with 27 rainy days.
#10 of 12 months in Lake Atitlán · #1116 of 1383 destinations to visit in September · comfort 60/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Lake Atitlán in September
Other months in Lake Atitlán
Lake Atitlán's forum calls December part of the reliable dry season — cool, brisk mornings in the mid-teens°C give way to pleasant afternoons in the low-to-mid 20s, with only the odd light shower breaking up mostly clear skies. Regulars recommend layers you can shed once the sun's up, since the highland chill at dawn catches some visitors off guard.
Add your own note from Lake Atitlán's card on the map.
Lake Atitlán climate normals — September
| Daytime high | 23°C / 73°F | 🌤 warm |
|---|---|---|
| Nighttime low | 18°C / 64°F | |
| Feels like (high) | 27°C / 81°F | |
| Rainfall | 369 mm / 14.5 in | ⛈ soaked |
| Rainy days | 27 days | |
| Humidity | 88% | 💦 very humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 12.2 h | |
| Wind | 8 km/h / 5 mph | |
| Air quality (US AQI) | 58 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Lake Atitlán in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyIndependence Day, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Lake Atitlán's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherLake Atitlán's weather peaks December–February, best around January.
Best weatherFair weatherToughest weather
What's on in Lake Atitlán in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Festival
Independence Day
14–15 SepNational holidayCrowdedTorch relays come round the lake road through the night of the 14th and every school in Solola parades the next morning. Firecrackers from before dawn and the boats keep their own hours. Source ↗
- Season
Wet season
MonsoonRisk27 rainy days and about 369 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Nearby, and something's on
Within 300 km of Lake Atitlán — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Lake Atitlán?
Lake Atitlán in September — FAQ
- Is September a good time to visit Lake Atitlán?
- September in Lake Atitlán: warm, soaked, with muggy air — a gamble, with 27 rainy days. It ranks #10 of 12 months for Lake Atitlán on SeasonMap's comfort score (60/100).
- What is the weather like in Lake Atitlán in September?
- In September, Lake Atitlán averages a daily high of 23°C and a low of 17.9°C, with about 368.9 mm of rain over roughly 26.9 rainy days.
- What is the air quality in Lake Atitlán in September?
- Lake Atitlán has a mean US Air Quality Index of about 58 in September.
Other months in Lake Atitlán
Compare Lake Atitlán in September
Warmer or cooler than Lake Atitlán in September
Similar destinations in Central America — September
Within 300 km: Antigua Guatemala's Independence Day on 14–15 Sep.