San Luis in Winter
In winter (June, July and August), San Luis sees average daytime highs around 17°C and overnight lows near 5°C, with 32 mm of precipitation over about 7 wet days across the season. It is the coldest season of the year and the driest season of the year.
Over the season highs climb from about 17°C in early June to 20°C by late August. The sky is clear or mostly clear about 59% of the time across winter, and the air most often feels dry.
Winter is San Luis's 3rd-best season to visit on our travel score. For the whole year in context, see San Luis's year-round climate.
- Avg daytime high
- 17°C
- coldest season of the year
- Avg overnight low
- 5°C
- Precipitation
- 32 mm
- 7 wet days
- Avg wind
- 10 km/h
- Travel score
- 6.6
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in San Luis in Winter
Over the season highs climb from about 17°C in early June to 20°C by late August.
A typical winter day in San Luis reaches about 17°C and drops to 5°C overnight. The warmest of the three months is August, the coolest July.
San Luis weather by month
How the three winter months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 29° / 18° | 107 | 13.3 | 14 | 5.3 |
| Feb | 28° / 17° | 81 | 10.9 | 13.2 | 6.3 |
| Mar | 26° / 15° | 80 | 10.1 | 12.3 | 7.1 |
| Apr | 22° / 11° | 53 | 7 | 11.2 | 7.4 |
| May | 18° / 8° | 25 | 4.2 | 10.3 | 6.8 |
| Jun | 16° / 5° | 8 | 1.9 | 9.8 | 6.3 |
| Jul | 16° / 4° | 9 | 2.1 | 10 | 6.1 |
| Aug | 18° / 6° | 15 | 2.6 | 10.8 | 7.4 |
| Sep | 21° / 9° | 30 | 4.6 | 11.8 | 7.6 |
| Oct | 24° / 12° | 66 | 8.7 | 12.8 | 7.5 |
| Nov | 26° / 14° | 89 | 11.7 | 13.7 | 6.7 |
| Dec | 28° / 17° | 102 | 13.1 | 14.2 | 5.8 |
Cloud cover in Winter
The sky is clear or mostly clear about 59% of the time across winter.
Chance of precipitation in Winter
San Luis gets around 32 mm of rain and snow over 7 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 10 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 10 hours in early June to 11 h 12 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 3.3 kWh/m².
Hazard calendar for San Luis
None of San Luis's seasonal hazards peak in winter. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
San Luis's rainy season runs October–April, when most of the year's rain falls.
Is winter a good time to visit San Luis?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit San Luis for sightseeing.
What to pack for San Luis in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, San Luis sees daytime highs around 17°C and nights near 5°C. Worth packing: a warm layer. About 7 days see rain.
UV index in San Luis in Winter
Clear-sky midday UV across winter averages around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in San Luis peaks around January 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 14 | 13 | 10 | 6 | 4 | 3 | 3 | 4 | 6 | 10 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | High | Moderate | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 13 | Extreme |
| Mar | 10 | Extreme |
| Apr | 6 | High |
| May | 4 | Moderate |
| Jun | 3 | Moderate |
| Jul | 3 | Moderate |
| Aug | 4 | Moderate |
| Sep | 6 | High |
| Oct | 10 | Very high |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Where is San Luis?
San Luis sits at 33.3°S, 66.3°W, 729 m above sea level, in Argentina. The nearest listed city is Villa Mercedes, 91 km away.
Topography around San Luis
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Luis.
Within 3 km, the terrain around San Luis has only modest variations in elevation — a maximum elevation change of 121 m around an average of 743 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,416 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,820 m.
The land around San Luis is covered by artificial surfaces (72%) within 3 km, shrubs (50%) and grassland (24%) within 16 km, and shrubs (59%) and grassland (22%) within 80 km.
Argentina travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / I
- 220 V · 50 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $14,898
- 2025
- Happiness
- 6.4 / 10
- World Happiness, 2025
- Homicide rate
- 4.5
- per 100k, 2023
- Road deaths
- 14.1
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- High
- EF EPI 575
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for San Luis (-33.2914°, -66.3247°, elevation 729 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.