Weather in Santiago in September 2025
Average weather
Average temperature in Santiago in September
The temperature in September is +66°F on average, with a range between a maximum of +79°F during the day and a minimum of +37°F at night.
The average maximum temperature goes up 30% by the end of the month, compared with the beginning of the month, from +66°F to +79°F.
Is Santiago warm or cold in September?
Santiago is typically mild in September.
Maximum temperatures go up compared to the previous month from +63°F to +66°F. The minimum temperature also goes up from +43°F to +45°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Santiago:
Climate in Santiago in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +63°F | +66°F | +72°F | ||||
| Min. temperature | ||||||
| +25°F | +28°F | +32°F | ||||
| Max. temperature | ||||||
| +88°F | +90°F | +90°F | ||||
| Rainfall | ||||||
| 77 mm | 55 mm | 31 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 2 m/s | ||||
| Humidity | ||||||
| 75% | 70% | 64% | ||||
| Air pressure | ||||||
| 1017 HPa | 1017 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 10 | 10 | 13 | ||||
| Cloudy days | ||||||
| 11 | 8 | 8 | ||||
| Rainy days | ||||||
| 10 | 12 | 10 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September often has better weather than August. It’s getting warmer as September arrives. The average maximum temperature goes up from +63°F to +66°F during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 77 mm to 55 mm. It feels drier, as humidity decreases from 75% to 70%. The average wind speed doesn’t change much during September, staying around 1 m/s. The amount of sunny days stay about the same, averaging 10 sunny days during the month.
October brings much the same weather, it remains good.
Wind
The average wind speed is 2 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Santiago is gradually increasing during September, going from 1 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Santiago?
Climate Change Over the Years
The climate in Santiago in September has not changed that much over the last 43 years.
The average temperature was the lowest in 2007 (+70°F) and the highest in 2020 (+75°F). The driest year was 1998 with only 165 mm of rainfall, and the wettest year was 1997 with 1031 mm.
FAQ
Is September a good time to visit Santiago?
Can you sunbathe in Santiago in September?
Is Santiago rainy in September?
Is it sunny in Santiago in September?
Other cities in Chile
Monthly weather in Santiago
Source of the data
For this page, we’ve looked at the typical weather in Santiago, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.