Monthly climate guide
Bahía Blanca weather in September
September in Bahía Blanca is typically mild, with average daytime highs around 19°C (65°F) and night-time lows near 5°C (42°F). The month usually brings about 49 mm of rain (fairly dry) and is a mix of sun and cloud. Daytime highs are 3°C warmer than August and 3°C cooler than October.
What stands out in September
- Seasonally, September counts as early spring in Bahía Blanca — the seasons are reversed south of the equator.
- Afternoons and nights feel like different seasons, roughly 13°C apart.
- Just 420 km apart, but Bahía Blanca runs about 5°C warmer than Mar del Plata this month.
Avg high
19°C
65°F
Avg low
5°C
42°F
Rainfall
49 mm
fairly dry
Humidity
64%
relative
Sky
52%
cloud · a mix of sun and cloud
Bahía Blanca weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 32°C / 90°F | 16°C / 61°F | 75 mm | 46% | 38% |
| February | 31°C / 87°F | 16°C / 60°F | 53 mm | 50% | 39% |
| March | 27°C / 80°F | 13°C / 55°F | 79 mm | 58% | 39% |
| April | 22°C / 71°F | 10°C / 49°F | 56 mm | 67% | 50% |
| May | 16°C / 62°F | 6°C / 44°F | 49 mm | 77% | 59% |
| June | 13°C / 55°F | 3°C / 37°F | 25 mm | 77% | 53% |
| July | 12°C / 54°F | 2°C / 36°F | 35 mm | 77% | 56% |
| August | 15°C / 59°F | 4°C / 38°F | 30 mm | 71% | 53% |
| September | 19°C / 65°F | 5°C / 42°F | 49 mm | 64% | 52% |
| October | 21°C / 71°F | 8°C / 46°F | 81 mm | 63% | 54% |
| November | 27°C / 80°F | 12°C / 53°F | 81 mm | 54% | 46% |
| December | 31°C / 88°F | 14°C / 58°F | 45 mm | 45% | 39% |
What to pack for September
- A warm sweater or fleece for layering
- A mid-weight jacket
- An extra layer — evenings are noticeably cooler than afternoons
- A small travel umbrella, just in case
Is September a good time to visit Bahía Blanca?
Compare the months in the chart above to find your ideal window.
Best time to visit Bahía Blanca →Other Argentina cities in September
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Bahía Blanca weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/argentina/bahia-blanca/september
<a href="https://weathercompare.eu/weather/argentina/bahia-blanca/september">Bahía Blanca weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/argentina/bahia-blanca" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Bahía Blanca weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/argentina/bahia-blanca/september">Bahía Blanca weather in September</a> – WeatherCompare</p>
Bahía Blanca in September: quick answers
Is September a good time to visit Bahía Blanca?
Yes. September is one of the best months for Bahía Blanca, with highs around 19°C and about 49 mm of rain.
How warm is Bahía Blanca in September?
Average highs are about 19°C (65°F) and average lows about 5°C (42°F), based on 10 years of daily data.
Does it rain a lot in Bahía Blanca in September?
Bahía Blanca typically gets around 49 mm of rain in September — fairly dry.
Figures are long-term averages for the area around Bahía Blanca (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.