Santiago Atitlán Weather in September
What's the weather like in Santiago Atitlán (Sololá) in September 2025?
The climate in Santiago Atitlán during September can be summarized as warm and very wet.
September is in the fall / autumn in Santiago Atitlán and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 14°C (57°F) is normal.
| Daytime temperature | 23.8°C 74.8°F |
|---|---|
| Nightly temperature | 13.6°C 56.5°F |
| Average temperature | 18.7°C 65.7°F |
| Daily sunshine | 5.9 hrs |
| Avg rainfall | 626 mm 24.6 ins |
| Rainy days | 25 days |
| Sea temperature | 29.5°C 85.1°F |
| Humidity | 87% |
| Windspeed | 7.6kph 5 mph |
On average September is the wettest month of the year in Santiago Atitlán with around 626mm 24.6 inches of rain making it a very wet time to visit. This rainfall is typically spread over 25 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.9 hours of sunshine per day.
September temperatures in Santiago Atitlán
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Santiago Atitlán in September 2025.
Other monthly averages
Best places to visit in September
Santiago Atitlán weather stats
| Hottest month: | March | 25.9°C 78.6°F |
|---|---|---|
| Driest month: | January | 17mm 0.7ins |
| Sunniest month: | January | 8.6hrs |
| Coldest month: | December | 24.3°C 75.7°F |
| Wettest month: | September | 626mm 24.6ins |
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