Santiago Weather in September
What's the weather like in Santiago (Nuevo León) in September 2025?
The climate in Santiago during September can be summarized as hot and very wet.
September is in the fall / autumn in Santiago and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a warm 31°C (88°F), whilst at night 20°C (68°F) is normal.
| Daytime temperature | 31°C 87.8°F |
|---|---|
| Nightly temperature | 20.2°C 68.4°F |
| Average temperature | 25.6°C 78.1°F |
| Daily sunshine | 5.5 hrs |
| Avg rainfall | 206 mm 8.1 ins |
| Rainy days | 8 days |
| Sea temperature | 29.4°C 85°F |
| Humidity | 70% |
| Windspeed | 11.2kph 7 mph |
On average September is the wettest month of the year in Santiago with around 206mm 8.1 inches of rain making it a very wet time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.5 hours of sunshine per day.
September temperatures in Santiago
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 in September 2025.
Other monthly averages
Best places to visit in September
Santiago weather stats
| Hottest month: | July | 34.3°C 93.7°F |
|---|---|---|
| Driest month: | December | 18mm 0.7ins |
| Sunniest month: | July | 7.1hrs |
| Coldest month: | January | 19.9°C 67.8°F |
| Wettest month: | September | 206mm 8.1ins |
© Google
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