Climate averages 1991–2020
San Luis weather
in January.
A hot, wet month: the warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in San Luis: daytime highs average 29.7°C and nights cool to about 19.2°C. By daytime temperature it is the warmest month of the year.
Expect about 107 mm of rain on roughly 13 days, which makes January a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 05 min on an average January day.
The nearest other city in this atlas is Villa Mercedes, Argentina (91 km away). In January its highs average 29.7°C, about as warm as San Luis, with 86 mm of rain.
Among the 67 cities listed in Argentina, San Luis ranks joint 26th of 67 for the warmest January highs and 48th of 67 for the driest January (rainfall, lowest first). The mean January high of those 67 cities is 29.0°C; San Luis is 0.7°C warmer than that mean.
From January to February, average highs fall by 1.4°C to 28.2°C, and monthly rainfall falls from 107 mm to 82 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
San Luis climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 29.7°C19.2°C | 19.2°C | 107 | 13.2 | 14.114 h |
| February | 28.2°C18.1°C | 18.1°C | 82 | 10.9 | 13.313 h |
| March | 26.0°C16.4°C | 16.4°C | 80 | 10.0 | 12.312 h |
| April | 21.8°C12.5°C | 12.5°C | 53 | 7.0 | 11.311 h |
| May | 18.6°C9.1°C | 9.1°C | 25 | 4.2 | 10.410 h |
| June | 16.4°C6.2°C | 6.2°C | 8.3 | 1.9 | 10.010 h |
| July | 15.9°C5.0°C | 5.0°C | 9.1 | 2.1 | 10.210 h |
| August | 18.9°C7.0°C | 7.0°C | 15 | 2.6 | 10.911 h |
| September | 21.3°C9.4°C | 9.4°C | 30 | 4.6 | 11.912 h |
| October | 23.9°C12.5°C | 12.5°C | 66 | 8.7 | 12.913 h |
| November | 26.6°C15.5°C | 15.5°C | 89 | 11.7 | 13.814 h |
| December | 28.9°C18.0°C | 18.0°C | 101 | 13.1 | 14.314 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Villa Mercedes, Argentina in JanuaryArgentina · 91 kmHigh 29.7°C · Low 18.9°C · 86 mm rain
- Río Cuarto in JanuaryArgentina · 184 kmHigh 28.8°C · Low 19.0°C · 96 mm rain
- San Martín in JanuaryArgentina · 201 kmHigh 31.3°C · Low 20.0°C · 48 mm rain
- San Rafael in JanuaryArgentina · 237 kmHigh 30.5°C · Low 18.3°C · 45 mm rain
- Mendoza in JanuaryArgentina · 239 kmHigh 28.4°C · Low 17.8°C · 48 mm rain
- Rawson in JanuaryArgentina · 282 kmHigh 30.5°C · Low 18.5°C · 17 mm rain
- San Juan, Argentina in JanuaryArgentina · 284 kmHigh 31.0°C · Low 19.2°C · 17 mm rain
- Córdoba in JanuaryArgentina · 290 kmHigh 28.8°C · Low 18.8°C · 133 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for San Luis) is explained once on the San Luis year overview and on the Sources, method and limits page.