Buenos Aires Sunrise & Sunset: September 2026

September Sunrise & Sunset in Buenos Aires: Complete Monthly Guide

In September 2026, Buenos Aires has an average of 11h 53m of daylight per day. Sunrise times range from 07:14 at the start of the month to 06:33 at the end, while sunset shifts from 18:36 to 18:56.

September in Buenos Aires brings lengthening spring days in the southern hemisphere. Average sunrise in September is 06:53 and average sunset is 18:46. The daily table above shows the exact sunrise and sunset time for each day of the month.

Day Length Variation in September

Day length in Buenos Aires in September changes throughout the month. Near the solstices (June 21 for the northern hemisphere, December 21 for the southern hemisphere), day length changes very slowly, less than 1 minute per day. Near the equinoxes (March 20 and September 22), day length changes rapidly, gaining or losing 2 to 4 minutes per day depending on latitude.

At Buenos Aires's latitude of -34.6°, the rate of day length change in September is approximately 1 to 2 minutes per day during the weeks furthest from the solstices. This means that sunrise in Buenos Aires shifts by approximately 20 to 40 minutes over the course of September.

Golden Hour in Buenos Aires in September

Golden hour in Buenos Aires in September occurs twice each day: in the morning shortly after sunrise, and in the evening before sunset. The duration depends on the sun's angle of elevation above the horizon, which varies with latitude and month. In Septemberat Buenos Aires's latitude of -34.6°, golden hour lasts approximately 40 to 65 minutes.

For photographers planning shoots in Buenos Aires in September: plan to arrive at your location 30 to 40 minutes before the listed sunrise time to capture blue hour before golden hour begins. The transition from blue hour to golden hour creates the most dramatic color sequences. Evening golden hour in September begins about 45 to 60 minutes before sunset and produces warmer, more orange tones than the morning session.

Blue Hour and Twilight in Buenos Aires in September

Civil twilight in Buenos Aires in September begins before sunrise and ends after sunset, creating windows of usable natural light even outside the official sunrise-to-sunset window. Civil twilight occurs when the sun is between 0 and 6 degrees below the horizon. Nautical twilight spans 6 to 12 degrees below the horizon. Astronomical twilight spans 12 to 18 degrees below the horizon.

The total twilight window in Buenos Aires in September extends the usable light day by approximately 45 to 70 minutes beyond the sunrise-to-sunset window. This extended twilight is valuable for photographers who want to shoot in soft, diffused light without harsh shadows.

Photography Tips for September in Buenos Aires

Shooting in Buenos Aires in September requires adapting to the season's specific light quality and timing. Camera settings for sunrise photography in September:

• Blue hour: ISO 800 to 1,600; aperture f/8; shutter speed 10 to 30 seconds on tripod.
• Golden hour: ISO 100 to 400; aperture f/8 to f/16 for landscapes, or f/1.8 to f/2.8 for portraits; shutter speed 1/250 to 1/1,000s handheld.
• Post-sunrise (30 minutes after): ISO 100; aperture f/11; shutter speed 1/500 to 1/2,000s.

In September, Buenos Aires's weather patterns affect photography conditions. Check cloud cover forecasts the evening before a planned shoot: a thin layer of clouds above the horizon creates more dramatic golden and orange tones than a clear sky. Fully overcast conditions produce flat, diffused light that is good for portraits but lacks the dramatic quality of golden hour. Partly cloudy skies create the most dramatic conditions.

About This Monthly Sunrise Data

All sunrise and sunset times in this September table for Buenos Aires are calculated using Jean Meeus astronomical algorithms, implemented via the SunCalc library. Calculations use the coordinates of Buenos Aires (-34.6037°, -58.3816°) and the local timezone (America/Argentina/Buenos_Aires). Times are accurate to within 1 minute and account for atmospheric refraction.

The times shown are for the center of the sun crossing the horizon. Sunrise is defined as the moment when the upper limb of the sun first appears above the mathematical horizon. Sunset is when the upper limb disappears below the horizon. Both definitions account for atmospheric refraction, which lifts the apparent position of the sun by approximately 0.5 to 1 degree near the horizon.

Frequently Asked Questions: September Sunrise & Sunset in Buenos Aires

What is the average sunrise time in Buenos Aires in September?

The average sunrise time in Buenos Aires in September 2026 is approximately 06:53. This is based on the mid-month calculation for Buenos Aires at latitude -34.60° and longitude -58.38°. Actual daily sunrise times vary from 07:14 on the first of the month to 06:33 on the last day. See the full daily table above for exact times.

How many hours of daylight does Buenos Aires get in September?

Buenos Aires receives an average of 11h 53m of daylight per day in September 2026. This is calculated as the difference between sunrise and sunset and does not include twilight periods. Day length varies from 11h 22m on the first of the month to 12h 24m on the last day.

What is the earliest sunrise in Buenos Aires in September?

The earliest sunrise in Buenos Aires in September 2026 occurs on 2026-09-30 at 06:33. The latest sunrise in the month occurs on 2026-09-01 at 07:14.

What time is golden hour in Buenos Aires in September?

Golden hour in Buenos Aires in September occurs twice daily. Morning golden hour begins at sunrise (06:53 at mid-month) and lasts approximately 40 to 65 minutes. Evening golden hour begins approximately 45 to 60 minutes before sunset (18:46 at mid-month). The precise start of golden hour is when the sun's altitude drops below 6 degrees above the horizon.

Is September a good time to photograph sunrise in Buenos Aires?

September is spring in Buenos Aires's southern hemisphere location. Sunrise at 06:53 provides a reasonable start time for photography.

When does civil twilight start in Buenos Aires in September?

Civil twilight in Buenos Aires in September begins approximately 20 to 30 minutes before sunrise and ends 20 to 30 minutes after sunset. At Buenos Aires's latitude of -34.6°, civil twilight in September starts around 06:28 in the morning. Civil twilight provides enough light for outdoor activities without artificial lighting and is considered the beginning of the usable photography window each day.