Santiago in September usually sees fair weather conditions, with an average daily high temperature of +31°C and roughly 1 sunny days. However, you should prepare for about 22 rainy days with an average precipitation of 104 mm. The weather is changeable so pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+31°C
Avg. max. temperature
+22°C
Min.
+36°C
Max.
104 mm
Total precipitation
78%
Avg. humidity
1 m/s
Avg. wind
1 ☀️
Sunny Days
3 ⛅️
Cloudy
22 🌦
Rainy
Our opinion: Santiago has OK weather in September.
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Average temperature in Santiago in September
Here are the expected maximum, average and minimum temperatures in Santiago for September based on the historical data.
Last Year
Historical Data
The temperature in September is +33°C on average, with a range between a maximum of +35°C during the day and a minimum of +24°C at night.
The average maximum temperature goes down 18% by the end of the month, compared with the beginning of the month, from +35°C to +33°C.
Is Santiago warm or cold in September?
Santiago is typically hot in September.
Maximum temperatures go down compared to the previous month from +32°C to +31°C. The minimum temperature also goes up from +24°C to +24°C.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
September is one of the warmest months in Santiago, here is the comparison with other months:
Climate in Santiago in September
Santiago weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+32°C
+31°C
+30°C
Min. temperature
+22°C
+22°C
+20°C
Max. temperature
+36°C
+36°C
+33°C
Rainfall
76 mm
104 mm
99 mm
Wind
2 m/s
1 m/s
1 m/s
Humidity
76%
78%
80%
Air pressure
1014 HPa
1012 HPa
1012 HPa
Sunny days
3
1
2
Cloudy days
4
3
3
Rainy days
21
22
23
Snowy days
0
0
0
September weather is still as ok as in August.It’s getting colder in September. From +32°C in the day, the average maximum temperature lowers to +31°C.Prepare for more rain. Average rainfall goes from 76 mm to 104 mm.Humidity rises from 76% to 78%.Winds are calmer in comparison to August, going down from 2 m/s to 1 m/s on average.The days becoming less sunny, going from 3 sunny days in August to 1 in September.
October brings much the same weather, it remains ok.
Wind speed in Santiago in September based on historical data.
Last Year
Historical Data
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 2 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Santiago based on historical data.
Last Year
Historical Data
A chance of rain on a typical day in September stands at 77%, leading to total precipitation of around 45 mm. The maximum amount of rainfall per day is around 4 mm, which is considered light rain.September is a pretty wet month with over 23 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
September is one of the rainiest months in Santiago, here is a comparison with other months, total mm:
Santiago wettest month is September, where a typical day has a 73% chance of precipitation and 104 mm of rainfall per day. January, on the other hand, is the driest month with a mere 29% chance of precipitation and 10 mm of rainfall per day.
How was the weather last September in Santiago?
This is the weather in Santiago in September 2024:
1 September
☀️
+35°C
2 September
☀️
+33°C
3 September
☀️
+33°C
4 September
☀️
+33°C
5 September
☁️
+33°C
6 September
☀️
+32°C
7 September
☁️
+31°C
8 September
☀️
+32°C
9 September
☀️
+33°C
10 September
☀️
+33°C
11 September
☀️
+33°C
12 September
☀️
+34°C
13 September
☀️
+34°C
14 September
☀️
+33°C
15 September
☀️
+33°C
16 September
☀️
+33°C
17 September
☀️
+33°C
18 September
☀️
+33°C
19 September
☁️
+33°C
20 September
☁️
+33°C
21 September
☀️
+34°C
22 September
☀️
+33°C
23 September
☁️
+32°C
24 September
☁️
+32°C
25 September
☀️
+32°C
26 September
☀️
+33°C
27 September
☁️
+33°C
28 September
☀️
+33°C
29 September
☁️
+32°C
30 September
☀️
+33°C
In September 2024 Santiago had 22 sunny days, 8 cloudy days, and 0 rainy days. The average maximum temperature was +33°C, with an absolute maximum of +35°C and a minimum of +31°C. The average humidity was 76%, with a maximum of 94% and a minimum of 49%. The average wind speed was 2 m/s, with a maximum of 7 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change over Years
This is how Santiago climate have been changing during last 43 years period.
The climate in Santiago in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+29°C) and the highest in 1990 (+31°C). The driest year was 2004 with only 403 mm of rainfall, and the wettest year was 1987 with 1025 mm.
FAQ
Frequently asked questions about the weather in Santiago in September:
Is September a good time to visit Santiago?
It’s always a good time to visit Santiago, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Santiago in September?
Absolutely, September is hot in Santiago. Plan on beach and pool time, and ensure that you pack light and breathable options to stay comfortable.
Is Santiago rainy in September?
Santiago is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Santiago in September?
Usually, it’s not very sunny in Santiago in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
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.
