Climate averages 1991–2020
San Luis weather
in April.
A mild, moderately wet month: the 7th warmest and the 6th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in San Luis: daytime highs average 21.8°C and nights cool to about 12.5°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 53 mm of rain on roughly 7 days, which makes April a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 17 min on an average April day.
The nearest other city in this atlas is Villa Mercedes, Argentina (91 km away). In April its highs average 21.8°C, about as warm as San Luis, with 67 mm of rain.
Among the 67 cities listed in Argentina, San Luis ranks joint 33rd of 67 for the warmest April highs and 12th of 67 for the driest April (rainfall, lowest first). The mean April high of those 67 cities is 21.8°C; San Luis is level with that mean.
From April to May, average highs fall by 3.3°C to 18.6°C, and monthly rainfall falls from 53 mm to 25 mm.
The annual picture
April 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, selected | 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
April in nearby cities
- Villa Mercedes, Argentina in AprilArgentina · 91 kmHigh 21.8°C · Low 12.1°C · 67 mm rain
- Río Cuarto in AprilArgentina · 184 kmHigh 21.9°C · Low 12.8°C · 67 mm rain
- San Martín in AprilArgentina · 201 kmHigh 22.0°C · Low 11.9°C · 20 mm rain
- San Rafael in AprilArgentina · 237 kmHigh 20.9°C · Low 10.1°C · 42 mm rain
- Mendoza in AprilArgentina · 239 kmHigh 19.4°C · Low 10.2°C · 40 mm rain
- Rawson in AprilArgentina · 282 kmHigh 22.9°C · Low 11.1°C · 18 mm rain
- San Juan, Argentina in AprilArgentina · 284 kmHigh 23.2°C · Low 11.6°C · 18 mm rain
- Córdoba in AprilArgentina · 290 kmHigh 22.3°C · Low 13.0°C · 75 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.