September weather forecastAntofagasta, Chile

September

Weather in September

September in Antofagasta marks the end of winter and a gradual return to warmer conditions. Noticeably, the wind speed registers an increase to 12.6km/h (7.8mph), ushering in a fresh sensation. Despite the slight rise in wind gusts, September remains conducive for a multitude of outdoor activities. Pleasant weather, minimal cloud cover, and a relatively stable climate continue to define Antofagasta in September.

Temperature

Antofagasta sees the arrival of September with an average high-temperature of a still refreshing 18.7°C (65.7°F), indicating a subtle variation from August. In the month of September, the average temperature dips to a mild 13°C (55.4°F) during the night.

Humidity

In September, the average relative humidity in Antofagasta is 70%.

Rainfall

January through May, September through December are months without rainfall.

Sea temperature

In Antofagasta, in September, the average water temperature is 14.8°C (58.6°F).
Note: It is advised against swimming in 14.8°C (58.6°F) when it drops below 10°C (50°F). Such temperatures can cause extreme cold shock, leading to hyperventilation.

Daylight

The average length of the day in September is 11h and 58min.
On the first day of the month, sunrise is at 06:51 and sunset at 18:31 -04. On the last day of September, in Antofagasta, sunrise is at 07:22 and sunset at 19:40 -03.
Note: On Sunday, 08. September 2024, at 00:00, Daylight Saving Time starts, and the time zone changes from -04 to -03. Daylight Saving Time lasts until Sunday, 06. April 2025, at 00:00; consequently, the time zone reverts from -03 to -04.

Sunshine

The months with the most sunshine are February, September through December, with an average of 10h of sunshine.

UV index

The months with the lowest UV index in Antofagasta are March through December, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: During September, 5 as the daily maximum UV index converts into the following advice:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.

Updated: Aug 30, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

During September, Antofagasta experiences an average high-temperature of 18.7°C (65.7°F) and a low-temperature of 13°C (55.4°F).

In Antofagasta, the average relative humidity in September is 70%.

In Antofagasta, rain does not fall in January through May, September through December.

In September, it doesn't rain. August is the latest month when it rains.

In September, the average sea temperature is 14.8°C (58.6°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

In Antofagasta, the average day length in September is 11h and 58min.

On the first day of September in Antofagasta, Chile, sunrise is at 06:51 and sunset at 18:31 -04. On the last day of the month, sunrise is at 07:22 and sunset at 19:40 -03.

On Sunday, 08. September 2024, at 00:00, Daylight Saving Time starts in Antofagasta, and the time zone changes from -04 to -03. DST ends on Sunday, 06. April 2025, at 00:00.

February, September through December, with an average of 10h of sunshine, are months with the most sunshine.

In Antofagasta, Chile, the average sunshine duration in September is 10h.

March through December, with an average maximum UV index of 5, are months with the lowest UV index.

In Antofagasta, Chile, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

18.5°C

18.7°C

19.3°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

12.3km/h

13.1km/h

13.9km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

0.5

0.4

0.1

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

30.3

29.9

Average UV index

Average cloud cover

Average visibility

10km

Average temperature in September
Antofagasta, Chile

Average high temperature in September: 18.7°C

The warmest month (with the highest average high temperature) is February (23.7°C).
The month with the lowest average high temperature is July (18.3°C).

Average low temperature in September: 13°C

The month with the highest average low temperature is February (18.8°C).
The coldest month (with the lowest average low temperature) is August (12.6°C).

Average pressure in September
Antofagasta, Chile

Average pressure in September: 1014.9mbar

The month with the highest atmospheric pressure is July (1015.5mbar).
The month with the lowest atmospheric pressure is February (1012mbar).

Average wind speed in September
Antofagasta, Chile

Average wind speed in September: 12.6km/h

The windiest month (with the highest average wind speed) is December (12.8km/h).
The calmest months (with the lowest average wind speed) are May and June (10.9km/h).

Average humidity in September
Antofagasta, Chile

Average humidity in September: 70%

The months with the highest relative humidity are February, March and April (75%).
The months with the lowest relative humidity are June and July (67%).

Average rainfall in September
Antofagasta, Chile

Average rainfall in September: 0mm

The wettest months (with the highest rainfall) are June, July and August (1mm).
The driest months (with the least rainfall) are January, February, March, April, May, September, October, November and December (0mm).

Average rainfall days in September
Antofagasta, Chile

Average rainfall days in September: 0.4 days

The month with the highest number of rainy days is July (1.6 days).
The month with the least rainy days is November (0 days).

Average sea temperature in September
Antofagasta, Chile

Average sea temperature in September: 14.8°C

The best month for swimming (with the highest average sea temperature) is February (20.8°C).
The coldest month (with the lowest average sea temperature) is August (14.6°C).

Average daylight in September /
Average sunshine in September
Antofagasta, Chile

Average daylight in September: 12h and 0min

The month with the longest days is December (Average daylight: 13h and 36min).
The month with the shortest days is June (Average daylight: 10h and 42min).

Average sunshine in September: 10h and 0min

The months with the most sunshine are February, September, October, November and December (Average sunshine: 10h and 0min).
The month with the least sunshine is July (Average sunshine: 9h and 48min).

Average sunshine days in September
Antofagasta, Chile

Average sunshine days in September: 29.9 days

The month with the most sunshine days is October (31 days).
The month with the least sunshine days is February (27.2 days).

Average UV index in September
Antofagasta, Chile

Average UV index in September: 5

The months with the highest UV index are January and February (UV index 6).
The months with the lowest UV index are March, April, May, June, July, August, September, October, November and December (UV index 5).

Average cloud cover in September
Antofagasta, Chile

Average cloud cover in September: 2

The month with the most cloud cover is February (Cloud cover 11).
The month with the least cloud cover is September (Cloud cover 2).

Average visibility in September
Antofagasta, Chile

Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).