September Weather in Chile - 2023

On South America's western edge, lies Chile, a long narrow country with over 6000 km (3729 Miles) of Pacific Ocean coastline. Up north is the driest desert in the world, and down south are waterfalls and glaciers.

Surrounded by the Andes and Chilean Coast Range Mountains, Santiago is Chile's largest city. It is also the nation's capital. The official language is Spanish. Chile is a culturally rich country,  and its people are friendly and hospitable. Snowbirds can look forward to exploring the wide horizons, nature & wildlife, interesting attractions, and pristine lands.

Weather September 2023 in Chile:

Generally, September in Chile will be slightly on the colder side, with an average temperature of around 62°F / 17°C. But due to the very dry air, it can feel somewhat uncomfortable for some people. You can expect around 8 rainy days, with on average 3.3 inches / 85 mm of rain during the month of September.
Resonable comfortable (very dry air) with nice temperatures

September weather in Chile

To get a good overview of the type of weather you can expect in September in Chile, we will look at the day and night temperature, minimum and maximum water temperature, and if September is comfortable or humid

Generally, September in Chile will be slightly on the colder side. Historical data shows that you can expect an average temperature of around 62°F / 17°C. But due to the very dry air, it can feel somewhat uncomfortable for some people. During the night, it will cool down to around 42°F / 6°C.

Chile has rainy days in September. You can expect around 8 rainy days, with on average 3.3 inches / 85 mm of rain during the whole month.

Average temperature
Average Sea temperature
Wintersun Comfort grade and huricane risk

The forecast for September 2023 is based on historical data and are averages. They will give a good indication what you can expect, but the daily temperature and rain will fluctuate during the month.

September weather in Chile in more detail

To get a better feeling for the type of weather, you can expect in September in Chile, we will look at the temperature, rain, wind, humidity, water temperature, and sun and clouds

- What will the temperature be in Chile in September

Generally, you can expect in September an average temperature of 62°F / 17°C during the day and an average of 42°F / 6°C during the night. In September, during the warmest part of the afternoon, the temperature can often get as high as 73°F / 23°C, and at the end of the night, it can get as low as 28°F / -2°C.

When looking at the whole year, June and July are the coldest months, with an average temperature of around 57°F / 14°C. February is the hottest month, with an average temperature of around 82°F / 28°C. When comparing September with the temperature in the month before and after, this is almost equal to August, which sees an average maximum temperature of around 59°F / 15°C. And almost equal to October, which sees an average maximum temperature of around 66°F / 19°C.

Day and night temperature variation for Chile during the year.
Day and night temperature variation for Chile during the year.

But average temperatures only tell half of the story. It is also good to check the maximum and minimum temperatures. When looking at the whole year, February is the hottest month, with a temperature of around 93°F / 34°C. July is the coldest month, with a temperature of around 66°F / 19°C. When comparing September with the temperature in the month before and after, this is almost equal to August, which sees an average maximum temperature of around 69°F / 21°C. And slightly less than October, which sees an average maximum temperature of around 78°F / 26°C.

In the following graph, you can see how many cold and hot days you can expect in Chile each month:

Day and night temperature variation for Chile during the year.
Day and night temperature variation for Chile during the year.

- Can you expect rain in September in Chile?

Generally, you can expect about 8 rain days in September, with on average 3.3 inches / 85 mm of rain.

When looking at the whole year, January is the dryest month, with an average rainfall of around 0.3 inches / 8 mmmm. June is the wettest month, with an average rainfall of around 10.5 inches / 266 mmmm. When comparing September with the month before and after, this is a lot less than August, which sees around 6.3 inches / 161 mm of rain. And a lot more than October, which sees around 2 inches / 52 mm of rain

Rain days for Chile during the year.
Rain days for Chile during the year.

If we look at the number of days with rain, January is the month with the least amount of rain days with around 2 days. June is the month with the most rain days with an average of between 14 and 15 days. When comparing September with the month before and after, this is slightly less than August, which sees an average of between 12 and 13 days of rain. And almost equal to October, which sees an average of between 6 and 7 days of rain

- What will the water temperature be in Chile for September

You can expect in September, the water temperature for Chile to be between 44°F / 7°C and 42°F / 6°C.

To compare the water temperature we will use the maximum water temperature. You can expect this temperature on a more sunny day, close to the shore, when the wind does not mix the relatively warmer and colder water.

February has the highest water temperature, with around 51°F / 11°C. July has the lowest water temperature, with an average of between 42°F / 6°C and 44°F / 7°C. When comparing the water temperature from September with the month before and after, September has a water temperature almost equal to August, with a water temperature of an average of between 42°F / 6°C and 44°F / 7°C. And almost equal to the water temperature from October, that is an average of between 44°F / 7°C and 46°F / 8°C.

Water temperature for Chile during the year.
Water temperature for Chile during the year.

- Can you expect in September a lot of sunny days in Chile

Generally, you can expect around 9 sunny days in September and around 13 partly sunny days. The remaining days will be cloudy.

When looking at the whole year, January is the month with the highest number of sunny days, with an average of between 17 and 18 sunny days. June is the month with the lowest number of sunny days, with an average of between 6 and 7 sunny days. When comparing September with the number of sunny days in the month before and after, it is almost equal to August, with around 7 sunny days. And almost equal to October, with around 9 sunny days

The number of sunny, partly sunny, and cloudy days for Chile
The number of sunny, partly sunny, and cloudy days for Chile

We have looked at the sunny days in Chile. Let's also look at the cloudy or overcast days. June is the month with the highest number of cloudy days, with an average of between 14 and 15 cloudy days. January is the month with the lowest number of cloudy days, with an average of between 1 and 2 cloudy days. When comparing September with the number of cloudy days in the month before and after, it is slightly lower than August, with an average of between 13 and 14 cloudy days. And almost equal to October, with around 8 cloudy days

- Will it be comfortable in September in Chile?

Generally, September in Chile will have very dry air, and can feel somewhat uncomfortable for some people. But will be fine for most..

We use the humidity and temperature in Chile to calculate the Wintersun Expert Comfort level for each month. The lower the Wintersun Expert Comfort level, the more comfortable it will be. Only for certain people, extremely dry air can feel slightly uncomfortable.

When looking at the whole year, June has the lowest humidity, with a Wintersun Expert comfort level of "comfortable" (very dry air). January has the highest humidity, with a Wintersun Expert comfort level of "comfortable" (very dry air). When comparing September with the month before and after, this is almost equal to August, which has a Wintersun Comfort level of "comfortable" (very dry air). And almost equal to October, which has a Wintersun Comfort level of "comfortable" (very dry air)

Wintersun Expert Humidity / Comfort level for Chile
Wintersun Expert Humidity / Comfort level for Chile

What to do in Chile in September

  • The Mummies Of Chinchorro: One of the fascinating attractions in Chile, The mummies are the oldest in the world! They're close to 8000 years old, which makes them even older than the Egyptian mummies.
  • Moon Valley: Located in San Pedro de Atacama, moon valley is used by NASA to carry out expeditions and tests because the terrain at the valley is very similar to that of Mars.
  • The Moai: This is a world-famous tourist destination. The moai are monolithic human figures carved from stone by the Rapa Nui people. There are over a thousand of these statues. It is also a world heritage site.
  • El tatio: This high altitude field is home to over 80 geysers. Strolling through the field can feel like an open-air natural Sauna.
  • Caves: One of the world's largest cave systems is on Easter Island. snowbirds can explore its underground lava tunnels that give over 7000 meter (22967 feet) of gallery.

Is it humid in Chile in September?

A lot of people ask interested in the humidity or relative humidity for Chile in September. But the real question they want to ask is not about humidity but the amount of moisture in the air. Or better, about comfort. Will it be comfortable in September in Chile, or will high humidity make it uncomfortable.

To answer this question, we have to look at the dew point. Relative humidity can change a lot in Chile during the day and night, as it changes when the amount of moisture changes and, but also when the temperature changes. It is a lot less reliable for comfort. Where the dew point only varies with the amount of moisture in the air.

Looking at the dew point, we can see that for the month of September, you can expect that Chile will have very dry air, and can feel somewhat uncomfortable for some people. But will be fine for most..

June is the month with the most comfort. It will have very dry air, and can feel somewhat uncomfortable for some people. But will be fine for most.. January is the most uncomfortable month. It will have very dry air, and can feel somewhat uncomfortable for some people. But will be fine for most.. In the graph, you can see that there is some difference between the most comfortable and most uncomfortable months

Humidity level for Chile
Humidity level for Chile

Is September a good time to go to Chile?

Trying to answer the question of whether September is a good time to go to Chile is not as easy as it first seems. Some people like colder weather, and others prefer a warmer climate. Some are fine with some humidity, and others are not. If your location has air conditioning, the night temperature is less important.

These are some examples. I will try to answer the question with a more generic person in mind. The more detailed information in this article should be enough to check further if this applies to you as well.

If we look at the average temperature for Chile in September, we can see that it will be on the colder side for most. In September, you can expect it to be slightly on the colder side, with an average temperature of around 62°F / 17°C. But due to the very dry air, it can feel somewhat uncomfortable for some people. During the night, it will be around 42°F / 6°C.

The number of overcast days is more than 5, but you can still the sun with around 9 sunny days and 13 partly sunny days.

The last aspect we will look at is rain. You can expect around 8 rainy days, with on average 3.3 inches / 85 mm of rain during September. More then 5 days rain per month makes the chance higher you will see some rain during a shorter stay. But a day with rain does not mean a day you can not enjoy.

We have looked at the average day temperature, the night temperature, humidity, the number of overcast days, and the rain. We think that September in Chile is not the most optimal destination. But that doesn't mean it is not a good time for you to go. As said before, each visitor has their own preferences when it comes to the weather.

Does it rain all day in Chile in September?

In Chile, it does not rain all day in September. You can expect around 8 rainy days, with on average 3.3 inches / 85 mm of rain during the month.

Another way of looking at the rain is the number of sunny days. For Chile, there are, on average 9 sunny days and 13 partly sunny days in September. That clearly shows that it is not raining all the time.

Is September the rainiest month in Chile?

September is not the month with the most rainy days, and not the month with the most rain.

To answer what the rainiest month is in Chile, we will both look at the month with the most rain, and the month with the highest number of rainy days.

June is the month with the the highest number of rainiest days. On average, you can expect 15 days with rain. January is the month with the lowest number of rainy days, with aproximately 2 days.

June is the month with the most rain. This is not equal as the one with the most rainy days. On average, you can expect 10.5 inches / 266 mm of rain. January is the month with the least amount of rain. This is not the same month as the one with the lowest number of rainy days. You can expect approximately 0.3 inches / 8 mm of rain.

Is September the most sunniest month in Chile?

September is not the month with the most sunny days, not the month with the most partly sunny days, and it is not the month with the lowest number of overcast days.

To answer what the sunniest month is in Chile, we will of course look at the month with the most sunniest days, but also look at the month with the biggest number of days that are sunny or partly sunny.

January is the month with the highest number of sunny days. On average, you can expect 9 sunny days, and 13 partly suny days. June is the month with the lowest number of sunny days.

January is the month with the highest number of sunny days and partly sunny days combined. While June is the month with the lowest number of sunny days and partly sunny days combined.

The last thing we will look at is the number of overcast days. January is the month with the lowest number of overcast days. While June is the month with the highest number of overcast days.

More information about Chile

Weather in Chile in other months

What to do in Chile for each month

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