Climate averages 1991–2020
San Luis weather
in August.
A mild, fairly dry month: the 9th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in San Luis: daytime highs average 18.9°C and nights cool to about 7.0°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 15 mm of rain on roughly 3 days, which makes August a fairly dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 54 min on an average August day.
The nearest other city in this atlas is Villa Mercedes, Argentina (91 km away). In August its highs average 18.6°C, about as warm as San Luis, with 21 mm of rain.
Among the 67 cities listed in Argentina, San Luis ranks 18th of 67 for the warmest August highs and 10th of 67 for the driest August (rainfall, lowest first). The mean August high of those 67 cities is 17.2°C; San Luis is 1.7°C warmer than that mean.
From August to September, average highs rise by 2.4°C to 21.3°C, and monthly rainfall rises from 15 mm to 30 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- Villa Mercedes, Argentina in AugustArgentina · 91 kmHigh 18.6°C · Low 6.5°C · 21 mm rain
- Río Cuarto in AugustArgentina · 184 kmHigh 17.8°C · Low 6.8°C · 20 mm rain
- San Martín in AugustArgentina · 201 kmHigh 17.7°C · Low 5.3°C · 10 mm rain
- San Rafael in AugustArgentina · 237 kmHigh 16.5°C · Low 3.2°C · 22 mm rain
- Mendoza in AugustArgentina · 239 kmHigh 15.1°C · Low 3.2°C · 25 mm rain
- Rawson in AugustArgentina · 282 kmHigh 19.1°C · Low 4.3°C · 10 mm rain
- San Juan, Argentina in AugustArgentina · 284 kmHigh 19.4°C · Low 5.0°C · 10 mm rain
- Córdoba in AugustArgentina · 290 kmHigh 19.1°C · Low 6.7°C · 18 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.