Weather in Antofagasta in September 2025
Average weather
Average temperature in Antofagasta in September
The temperature in September is +21°C on average, with a range between a maximum of +23°C during the day and a minimum of +13°C at night.
The average maximum temperature goes up 10% by the end of the month, compared with the beginning of the month, from +21°C to +22°C.
Is Antofagasta warm or cold in September?
Antofagasta is typically mild in September.
Maximum temperatures go up compared to the previous month from +20°C to +20°C. The minimum temperature also goes up from +13°C to +14°C.
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 Antofagasta:
Water temperature in Antofagasta in September
Water in Antofagasta in September is Cold. It varies from +14°C to +16°C, with an average of +15°C. This is almost similar to the air temperature, which averages +20°C.
The water temperature in September is one of the coldest of the entire year:
Can you swim in Antofagasta in September?
Climate in Antofagasta in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +20°C | +20°C | +21°C | ||||
| Min. temperature | ||||||
| +8°C | +9°C | +12°C | ||||
| Max. temperature | ||||||
| +27°C | +26°C | +24°C | ||||
| Rainfall | ||||||
| 7 mm | 5 mm | 4 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +15°C | +15°C | +16°C | ||||
| Humidity | ||||||
| 91% | 91% | 91% | ||||
| Air pressure | ||||||
| 1015 HPa | 1015 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 12 | 12 | 10 | ||||
| Cloudy days | ||||||
| 10 | 10 | 12 | ||||
| Rainy days | ||||||
| 8 | 8 | 9 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. The temperature levels stay the same in the area of +20°C for average maximum temperature during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 7 mm to 5 mm. Humidity levels don’t change as the month goes on, averaging around 91%. The average wind speed doesn’t change much during September, staying around 2 m/s. The amount of sunny days stay about the same, averaging 12 sunny days during the month.
October brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Antofagasta is gradually increasing during September, going from 3 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Antofagasta?
Climate Change over Years
The climate in Antofagasta in September has not changed much over the last 43 years.
The average temperature was the lowest in 2022 (+21°C) and the highest in 1997 (+23°C). The driest year was 1980 with only 25 mm of rainfall, and the wettest year was 1991 with 128 mm.
FAQ
Is September a good time to visit Antofagasta?
Can you sunbathe in Antofagasta in September?
Can you swim in Antofagasta in September?
Is Antofagasta rainy in September?
Is it sunny in Antofagasta in September?
Other cities in Chile
Monthly weather in Antofagasta
Source of the data
For this page, we’ve looked at the typical weather in Antofagasta, 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.