San Luis climate
San Luis (Argentina) has a monsoon-influenced humid subtropical climate (Köppen Cwa). The average temperature over the year is 17 °C62 °F, and about 694 mm27 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
San Luis climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 3290 | 1763 | 2576 | 1275.0 | 0 |
| Feb | 3086 | 1661 | 2374 | 1134.4 | 0 |
| Mar | 2882 | 1457 | 2169 | 843.3 | 0 |
| Apr | 2373 | 1050 | 1661 | 502.0 | 0 |
| May | 1865 | 643 | 1254 | 230.9 | 1 |
| Jun | 1560 | 337 | 948 | 60.2 | 4 |
| Jul | 1559 | 235 | 847 | 90.4 | 6 |
| Aug | 1864 | 439 | 1151 | 90.4 | 4 |
| Sep | 2170 | 744 | 1457 | 230.9 | 1 |
| Oct | 2578 | 1050 | 1864 | 522.0 | 0 |
| Nov | 2984 | 1456 | 2170 | 923.6 | 0 |
| Dec | 3188 | 1661 | 2374 | 1074.2 | 0 |
| Year | 3290 | 235 | 1762 | 69427 | 16 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 51% | 42% | 7.7 | 14:07 |
| Feb | 56% | 43% | 6.7 | 13:20 |
| Mar | 60% | 39% | 5.4 | 12:23 |
| Apr | 65% | 42% | 4.0 | 11:18 |
| May | 69% | 54% | 3.0 | 10:25 |
| Jun | 67% | 45% | 2.8 | 9:58 |
| Jul | 64% | 46% | 3.0 | 10:09 |
| Aug | 55% | 42% | 3.9 | 10:54 |
| Sep | 50% | 42% | 5.1 | 11:56 |
| Oct | 49% | 42% | 6.3 | 12:59 |
| Nov | 47% | 38% | 7.5 | 13:54 |
| Dec | 48% | 39% | 8.0 | 14:21 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of San Luis is like
The warmest month is January, with an average high of 32 °C90 °F and a low of 17 °C63 °F. The coldest is July, when highs average 15 °C59 °F and lows 2 °C35 °F. There is a clear seasonal cycle, with 16.3 °C29.4 °F between the average temperature of the warmest and the coolest month.
Annual precipitation is moderate at about 694 mm27 in. The wettest three-month stretch is December–February, which brings 50% of the annual total. Months with less than 20 mm0.8 in on average: June–August. The wettest month is January (127 mm5.0 in), the driest is June (6 mm0.2 in).
Relative humidity ranges from 47% in November to 69% in May. The clearest skies (lowest average cloud amount, 38%) are typical of November. Average wind speed near the ground ranges from 9 km/h (6 mph) in May to 13 km/h (8 mph) in October. Daylight lasts from about 10.0 hours in June to 14.3 hours in December.
Best time to visit San Luis
Based on these averages, the most comfortable months for sightseeing and outdoor activities are March–May and September and October: average highs of 18 °C65 °F to 28 °C82 °F with 23 mm0.9 in to 84 mm3.3 in of precipitation per month.
The most challenging month is January, which is hot, with average highs of 32 °C90 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for San Luis
- Summer (December–February) — highs 3086 to 32 °C90 °F, lows 1661 to 17 °C63 °F, about 115 mm4.5 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Autumn (March–May) — highs 1865 to 28 °C82 °F, lows 643 to 14 °C57 °F, about 52 mm2.1 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Winter (June–August) — highs 1559 to 18 °C64 °F, lows 235 to 4 °C39 °F, about 8 mm0.3 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
- Spring (September–November) — highs 2170 to 29 °C84 °F, lows 744 to 14 °C56 °F, about 56 mm2.2 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
How San Luis compares
Compared with Córdoba, about 290 km to the northeast, San Luis is on average 1.9 °C3.4 °F cooler and receives 13% less precipitation (694 mm27 in vs 799 mm31 in). The difference is largest in July (3.2 °C5.7 °F cooler).
Of the 31 places in Argentina covered by World Climates, San Luis is the 20th warmest by annual mean temperature and the 22nd wettest by annual precipitation. See all of them on the Argentina climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Xichang (China, Cwa), Botshabelo (South Africa, BSk) and Bloemfontein (South Africa, BSk).
Nearby places
- Río Cuarto 184 km · 17 °C62 °F · 811 mm32 in
- San Rafael 237 km · 17 °C62 °F · 410 mm16 in
- Mendoza 239 km · 17 °C63 °F · 290 mm11 in
- Rawson 282 km · 21 °C70 °F · 145 mm5.7 in
- Córdoba 290 km · 19 °C66 °F · 799 mm31 in
- Santiago 402 km · 19 °C67 °F · 274 mm11 in
- Colina 405 km · 20 °C68 °F · 256 mm10 in
- Santa Rosa 414 km · 16 °C61 °F · 743 mm29 in
Frequently asked questions
What is the warmest month in San Luis?
January is the warmest month in San Luis, with an average high of 32 °C (90 °F) and an average low of 17 °C (63 °F).
What is the coldest month in San Luis?
July is the coldest month, with an average high of 15 °C (59 °F) and an average low of 2 °C (35 °F).
When does it rain the most in San Luis?
January is the wettest month with about 127 mm (5.0 in) of precipitation; June is the driest with about 6 mm (0.2 in).
What is the best time to visit San Luis?
Judging by long-term averages, the most comfortable months are March–May and September and October.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.