Ciudad Tecún Umán Weather in September
What's the weather like in Ciudad Tecún Umán (San Marcos) in September 2025?
The climate in Ciudad Tecún Umán during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in Ciudad Tecún Umán and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a steamy 33°C (91°F), whilst at night 21°C (70°F) is normal.
| Daytime temperature | 32.6°C 90.6°F |
|---|---|
| Nightly temperature | 21.3°C 70.3°F |
| Average temperature | 26.9°C 80.4°F |
| Daily sunshine | 5.7 hrs |
| Avg rainfall | 441 mm 17.3 ins |
| Rainy days | 20 days |
| Sea temperature | 29.6°C 85.2°F |
| Humidity | 81% |
| Windspeed | 7.9kph 5 mph |
On average September is the wettest month of the year in Ciudad Tecún Umán with around 441mm 17.3 inches of rain making it a very wet time to visit. This rainfall is typically spread over 20 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.7 hours of sunshine per day.
September temperatures in Ciudad Tecún Umán
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 Ciudad Tecún Umán in September 2025.
Other monthly averages
Best places to visit in September
Ciudad Tecún Umán weather stats
| Hottest month: | April | 34.2°C 93.6°F |
|---|---|---|
| Driest month: | January | 7mm 0.3ins |
| Sunniest month: | January | 7.7hrs |
| Coldest month: | January | 32.7°C 90.9°F |
| Wettest month: | September | 441mm 17.4ins |
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