Buenos Aires
September
Weather in Buenos Aires for September 2025
Your guide to Buenos Aires weather in September - trends and predictions
In general, the average temperature in Buenos Aires at the beginning of September is 15 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 17.7 °C by the end of September.
The climate of Buenos Aires in September is notably wet, with an average of 11 rainy days.
Is September a good time to visit Buenos Aires? check out the best time to travel to Buenos Aires page.
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19
Dry days
11
Rainy days
0
Snow days
16°/11°
Temperatures
25 km/h
Avg max wind
73 %
Avg humidity
Buenos Aires in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2  17° | 3  15° | 4  15° | 5 12° | 6 15° | 7  15° |
| 8 16° | 9 17° | 10  18° | 11  16° | 12 15° | 13 15° | 14 17° |
| 15  19° | 16 21° | 17 17° | 18 18° | 19 17° | 20  18° | 21  20° |
| 22 19° | 23 17° | 24 17° | 25 16° | 26 14° | 27 17° | 28 20° |
| 29 20° | 30 20° |
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Temperatures trend during September in Buenos Aires
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Partly cloudy | 16° /10° | 1.1 mm | 5 | |
| 2 Sept. | Heavy rain | 17° /10° | 19 mm | 5 | |
| 3 Sept. | Moderate rain | 15° /10° | 21.8 mm | 5 | |
| 4 Sept. | Overcast | 15° /9° | 0.1 mm | 4 | |
| 5 Sept. | Partly cloudy | 12° /7° | 0 mm | 4 | |
| 6 Sept. | Partly cloudy | 15° /9° | 0 mm | 5 | |
| 7 Sept. | Light rain shower | 15° /11° | 7.4 mm | 4 | |
| 8 Sept. | Partly cloudy | 16° /9° | 0.1 mm | 5 | |
| 9 Sept. | Overcast | 17° /11° | 0 mm | 5 | |
| 10 Sept. | Sunny | 18° /12° | 0.4 mm | 5 | |
| 11 Sept. | Moderate or heavy rain shower | 16° /12° | 13 mm | 5 | |
| 12 Sept. | Overcast | 15° /10° | 0 mm | 4 | |
| 13 Sept. | Partly cloudy | 15° /9° | 0 mm | 5 | |
| 14 Sept. | Partly cloudy | 17° /9° | 0 mm | 6 | |
| 15 Sept. | Cloudy | 19° /10° | 0 mm | 6 | |
| 16 Sept. | Sunny | 21° /13° | 0 mm | 6 | |
| 17 Sept. | Light rain shower | 17° /12° | 4.4 mm | 5 | |
| 18 Sept. | Partly cloudy | 18° /12° | 0.4 mm | 6 | |
| 19 Sept. | Patchy rain possible | 17° /12° | 3 mm | 5 | |
| 20 Sept. | Light drizzle | 18° /12° | 1.6 mm | 5 | |
| 21 Sept. | Fog | 20° /14° | 0.3 mm | 6 | |
| 22 Sept. | Patchy rain possible | 19° /14° | 4 mm | 5 | |
| 23 Sept. | Patchy rain possible | 17° /13° | 0.1 mm | 5 | |
| 24 Sept. | Partly cloudy | 17° /13° | 0 mm | 6 | |
| 25 Sept. | Cloudy | 16° /12° | 0 mm | 5 | |
| 26 Sept. | Light rain shower | 14° /11° | 7.1 mm | 4 | |
| 27 Sept. | Partly cloudy | 17° /10° | 0 mm | 6 | |
| 28 Sept. | Partly cloudy | 20° /11° | 0 mm | 6 | |
| 29 Sept. | Light drizzle | 20° /13° | 0.3 mm | 5 | |
| 30 Sept. | Sunny | 20° /13° | 3 mm | 6 | |
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Important Notice
Our weather forecast for Buenos Aires in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Buenos Aires forecast closer to your planned date for the most up-to-date weather information.
Buenos Aires in September - FAQ
What are the expected maximum and minimum temperatures in Buenos Aires during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Buenos Aires during September?
Significant rainfall exceeding 141 mm is expected in Buenos Aires during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Buenos Aires during September?
The average wind speed in Buenos Aires during September is 25 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Buenos Aires in September?
As you prepare for your trip to Buenos Aires in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Buenos Aires, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
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