Monthly climate guide
San Luis weather in January
Expect very hot weather in San Luis in January: afternoons reach about 32°C (90°F), while nights drop to around 18°C (64°F). Around 100 mm of rain falls over the month (wet), and skies are a mix of sun and cloud. Daytime highs are about the same as December and 2°C warmer than February.
What stands out in January
- San Luis is usually about 8°C warmer than Mar del Plata in January.
- Seasonally, January counts as mid-summer in San Luis — the seasons are reversed south of the equator.
- It's wetter than a typical month in San Luis — roughly 85% more rain than average.
- Expect a big gap between day and night — about 15°C.
January is typically San Luis's warmest month.
Avg high
32°C
90°F
Avg low
18°C
64°F
Rainfall
100 mm
wet
Humidity
50%
relative
Sky
41%
cloud · a mix of sun and cloud
San Luis weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 32°C / 90°F | 18°C / 64°F | 100 mm | 50% | 41% |
| February | 30°C / 87°F | 17°C / 62°F | 124 mm | 57% | 43% |
| March | 28°C / 82°F | 14°C / 57°F | 72 mm | 59% | 37% |
| April | 24°C / 74°F | 11°C / 51°F | 65 mm | 66% | 46% |
| May | 19°C / 67°F | 7°C / 45°F | 19 mm | 71% | 55% |
| June | 16°C / 61°F | 4°C / 39°F | 8 mm | 67% | 41% |
| July | 16°C / 60°F | 3°C / 37°F | 5 mm | 64% | 44% |
| August | 19°C / 66°F | 5°C / 40°F | 8 mm | 55% | 39% |
| September | 22°C / 72°F | 7°C / 45°F | 21 mm | 51% | 40% |
| October | 25°C / 77°F | 10°C / 50°F | 57 mm | 51% | 45% |
| November | 29°C / 84°F | 14°C / 57°F | 101 mm | 49% | 40% |
| December | 32°C / 89°F | 16°C / 61°F | 70 mm | 46% | 37% |
What to pack for January
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- An extra layer — evenings are noticeably cooler than afternoons
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is January a good time to visit San Luis?
Compare the months in the chart above to find your ideal window.
Best time to visit San Luis →Other Argentina cities in January
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San Luis weather in January. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/argentina/san-luis/january
<a href="https://weathercompare.eu/weather/argentina/san-luis/january">San Luis weather in January</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/argentina/san-luis" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="San Luis weather in January"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/argentina/san-luis/january">San Luis weather in January</a> – WeatherCompare</p>
San Luis in January: quick answers
Is January a good time to visit San Luis?
It can be, if you like heat: January highs in San Luis are around 32°C. Good for the beach; plan sightseeing for early morning and evening.
How warm is San Luis in January?
Average highs are about 32°C (90°F) and average lows about 18°C (64°F), based on 10 years of daily data.
Does it rain a lot in San Luis in January?
San Luis typically gets around 100 mm of rain in January — wet.
Figures are long-term averages for the area around San Luis (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.