Monthly climate guide
La Rioja weather in September
Expect warm weather in La Rioja in September: afternoons reach about 26°C (78°F), while nights drop to around 11°C (51°F). Around 18 mm of rain falls over the month (very dry), and skies are mostly sunny. Daytime highs are 4°C warmer than August and 3°C cooler than October.
What stands out in September
- Expect a big gap between day and night — about 15°C.
- September brings early spring to La Rioja — the seasons are reversed south of the equator.
- Just 290 km apart, but La Rioja runs about 2°C warmer than San Juan this month.
- Skies are at their clearest this time of year.
Avg high
26°C
78°F
Avg low
11°C
51°F
Rainfall
18 mm
very dry
Humidity
42%
relative
Sky
30%
cloud · mostly sunny
La Rioja weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 34°C / 92°F | 21°C / 69°F | 97 mm | 51% | 48% |
| February | 32°C / 89°F | 20°C / 67°F | 87 mm | 59% | 50% |
| March | 29°C / 85°F | 17°C / 63°F | 65 mm | 62% | 43% |
| April | 26°C / 79°F | 14°C / 58°F | 33 mm | 63% | 45% |
| May | 22°C / 72°F | 11°C / 51°F | 5 mm | 63% | 49% |
| June | 19°C / 66°F | 7°C / 44°F | 5 mm | 57% | 41% |
| July | 18°C / 65°F | 6°C / 42°F | 3 mm | 55% | 38% |
| August | 22°C / 72°F | 8°C / 46°F | 4 mm | 43% | 29% |
| September | 26°C / 78°F | 11°C / 51°F | 18 mm | 42% | 30% |
| October | 29°C / 84°F | 14°C / 58°F | 19 mm | 43% | 39% |
| November | 32°C / 89°F | 18°C / 64°F | 40 mm | 44% | 41% |
| December | 34°C / 92°F | 20°C / 68°F | 67 mm | 46% | 41% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- An extra layer — evenings are noticeably cooler than afternoons
- Sunglasses
Is September a good time to visit La Rioja?
Compare the months in the chart above to find your ideal window.
Best time to visit La Rioja →Other Argentina cities in September
Cite or embed this data
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La Rioja weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/argentina/la-rioja/september
<a href="https://weathercompare.eu/weather/argentina/la-rioja/september">La Rioja weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/argentina/la-rioja" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="La Rioja weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/argentina/la-rioja/september">La Rioja weather in September</a> – WeatherCompare</p>
La Rioja in September: quick answers
Is September a good time to visit La Rioja?
September is a reasonable time for La Rioja: highs around 26°C and about 18 mm of rain, though not one of the three best months.
How warm is La Rioja in September?
Average highs are about 26°C (78°F) and average lows about 11°C (51°F), based on 10 years of daily data.
Does it rain a lot in La Rioja in September?
La Rioja typically gets around 18 mm of rain in September — very dry.
Figures are long-term averages for the area around La Rioja (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.