Climate averages 1991–2020
San Juan, Argentina weather
in May.
A mild, very dry month: the 9th warmest and the joint 3rd 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 Juan, Argentina: daytime highs average 19.6°C and nights cool to about 7.6°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 10 mm of rain on roughly 3 days, which makes May a very dry month (the joint 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 32 min on an average May day.
The nearest other city in this atlas is Rawson (5 km away). In May its highs average 19.3°C, about as warm as San Juan, Argentina, with 10 mm of rain.
Among the 67 cities listed in Argentina, San Juan, Argentina ranks joint 13th of 67 for the warmest May highs and joint 1st of 67 for the driest May (rainfall, lowest first). The mean May high of those 67 cities is 18.0°C; San Juan, Argentina is 1.6°C warmer than that mean.
From May to June, average highs fall by 2.2°C to 17.4°C, and monthly rainfall falls from 10 mm to 7.8 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 Juan, Argentina climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.0°C19.2°C | 19.2°C | 17 | 3.2 | 13.914 h |
| February | 29.7°C18.0°C | 18.0°C | 20 | 3.4 | 13.213 h |
| March | 27.2°C15.8°C | 15.8°C | 24 | 3.9 | 12.312 h |
| April | 23.2°C11.6°C | 11.6°C | 18 | 3.3 | 11.311 h |
| May, selected | 19.6°C7.6°C | 7.6°C | 10 | 2.6 | 10.511 h |
| June | 17.4°C4.1°C | 4.1°C | 7.8 | 2.0 | 10.110 h |
| July | 16.4°C2.9°C | 2.9°C | 8.2 | 2.2 | 10.310 h |
| August | 19.4°C5.0°C | 5.0°C | 10 | 2.3 | 11.011 h |
| September | 21.8°C8.0°C | 8.0°C | 17 | 3.3 | 11.912 h |
| October | 25.1°C11.8°C | 11.8°C | 21 | 3.5 | 12.813 h |
| November | 28.0°C15.0°C | 15.0°C | 16 | 3.2 | 13.714 h |
| December | 30.3°C17.7°C | 17.7°C | 22 | 3.3 | 14.214 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
- Rawson in MayArgentina · 5 kmHigh 19.3°C · Low 7.1°C · 10 mm rain
- Mendoza in MayArgentina · 153 kmHigh 15.5°C · Low 6.4°C · 30 mm rain
- San Martín in MayArgentina · 172 kmHigh 17.8°C · Low 8.1°C · 12 mm rain
- Colina in MayChile · 274 kmHigh 19.7°C · Low 8.8°C · 81 mm rain
- Ovalle in MayChile · 275 kmHigh 22.6°C · Low 11.5°C · 29 mm rain
- San Luis in MayArgentina · 284 kmHigh 18.6°C · Low 9.1°C · 25 mm rain
- Peñalolén in MayChile · 286 kmHigh 17.2°C · Low 6.0°C · 79 mm rain
- Quilicura in MayChile · 289 kmHigh 18.7°C · Low 7.2°C · 81 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 Juan) is explained once on the San Juan, Argentina year overview and on the Sources, method and limits page.
Rawson lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.