Climate averages 1991–2020
San Luis weather
in May.
A mild, fairly dry month: the 10th warmest and the 4th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in San Luis: daytime highs average 18.6°C and nights cool to about 9.1°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 25 mm of rain on roughly 4 days, which makes May a fairly dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 26 min on an average May day.
The nearest other city in this atlas is Villa Mercedes, Argentina (91 km away). In May its highs average 18.5°C, about as warm as San Luis, with 29 mm of rain.
Among the 67 cities listed in Argentina, San Luis ranks 24th of 67 for the warmest May highs and 6th of 67 for the driest May (rainfall, lowest first). The mean May high of those 67 cities is 18.0°C; San Luis is 0.6°C warmer than that mean.
From May to June, average highs fall by 2.1°C to 16.4°C, and monthly rainfall falls from 25 mm to 8.3 mm.
The annual picture
May 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, selected | 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
May in nearby cities
- Villa Mercedes, Argentina in MayArgentina · 91 kmHigh 18.5°C · Low 8.8°C · 29 mm rain
- Río Cuarto in MayArgentina · 184 kmHigh 18.3°C · Low 9.4°C · 34 mm rain
- San Martín in MayArgentina · 201 kmHigh 17.8°C · Low 8.1°C · 12 mm rain
- San Rafael in MayArgentina · 237 kmHigh 17.1°C · Low 6.5°C · 31 mm rain
- Mendoza in MayArgentina · 239 kmHigh 15.5°C · Low 6.4°C · 30 mm rain
- Rawson in MayArgentina · 282 kmHigh 19.3°C · Low 7.1°C · 10 mm rain
- San Juan, Argentina in MayArgentina · 284 kmHigh 19.6°C · Low 7.6°C · 10 mm rain
- Córdoba in MayArgentina · 290 kmHigh 18.8°C · Low 9.6°C · 35 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.