San Juan in Winter
In winter (June, July and August), San Juan sees average daytime highs around 18°C and overnight lows near 3°C, with 26 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 18°C in early June to 21°C by late August. The sky is clear or mostly clear about 69% of the time across winter, and the air most often feels dry.
Winter is San Juan's 3rd-best season to visit on our travel score. For the whole year in context, see San Juan's year-round climate.
- Avg daytime high
- 18°C
- coldest season of the year
- Avg overnight low
- 3°C
- Precipitation
- 26 mm
- 7 wet days
- Avg wind
- 9 km/h
- Travel score
- 7.4
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in San Juan in Winter
Over the season highs climb from about 18°C in early June to 21°C by late August.
A typical winter day in San Juan reaches about 18°C and drops to 3°C overnight. The warmest of the three months is August, the coolest July.
How winter really feels in San Juan
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 28 that feel at or below 0°C.
The story in winter is cold — wind chill drags the overnight "feels like" below the raw low.
San Juan 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 | 33° / 19° | 17 | 3.2 | 13.8 | 4.6 |
| Feb | 31° / 18° | 20 | 3.4 | 13.2 | 5.3 |
| Mar | 29° / 16° | 24 | 3.9 | 12.2 | 6.9 |
| Apr | 24° / 11° | 18 | 3.3 | 11.3 | 8.4 |
| May | 20° / 7° | 11 | 2.6 | 10.4 | 7.8 |
| Jun | 18° / 3° | 8 | 2 | 10 | 7.2 |
| Jul | 17° / 2° | 8 | 2.2 | 10.2 | 7.0 |
| Aug | 20° / 5° | 10 | 2.3 | 10.8 | 8.1 |
| Sep | 23° / 9° | 18 | 3.3 | 11.8 | 8.5 |
| Oct | 26° / 12° | 21 | 3.5 | 12.8 | 8.2 |
| Nov | 29° / 15° | 16 | 3.2 | 13.6 | 6.7 |
| Dec | 32° / 18° | 22 | 3.3 | 14 | 5.2 |
Cloud cover in Winter
The sky is clear or mostly clear about 69% of the time across winter.
Chance of precipitation in Winter
San Juan gets around 26 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 9 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 10 h 06 min in early June to 11 h 18 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 3.8 kWh/m².
Is winter a good time to visit San Juan?
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 one of the better times to visit San Juan for general sightseeing.
What to pack for San Juan in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, San Juan sees daytime highs around 18°C and nights near 3°C. Worth packing: a warm layer and sun protection. About 7 days see rain.
UV index in San Juan 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 Juan peaks around January 18 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 | 11 | 6 | 4 | 3 | 4 | 5 | 7 | 11 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | High | Moderate | Moderate | Moderate | Moderate | High | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 13 | Extreme |
| Mar | 11 | Extreme |
| Apr | 6 | High |
| May | 4 | Moderate |
| Jun | 3 | Moderate |
| Jul | 4 | Moderate |
| Aug | 5 | Moderate |
| Sep | 7 | High |
| Oct | 11 | Extreme |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Where is San Juan?
San Juan sits at 31.5°S, 68.5°W, 646 m above sea level, in Argentina. The nearest listed city is Santa Lucía, 3.0 km away.
Topography around San Juan
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Juan.
Within 3 km, the terrain around San Juan has only modest variations in elevation — a maximum elevation change of 55 m around an average of 636 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 744 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,836 m.
The land around San Juan is covered by artificial surfaces (87%) within 3 km, bare terrain (26%) and shrubs (25%) within 16 km, and shrubs (39%), bare terrain (36%) and grassland (21%) 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 Juan (-31.5373°, -68.5257°, elevation 646 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.