San Juan in Fall
In fall (March, April and May), San Juan sees average daytime highs around 24°C and overnight lows near 11°C, with 53 mm of rain over about 10 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 30°C in early March to 19°C by late May. The sky is clear or mostly clear about 63% of the time across fall, and the air most often feels dry.
Fall is San Juan's 2nd-best season to visit on our travel score. For the whole year in context, see San Juan's year-round climate.
- Avg daytime high
- 24°C
- 3rd-warmest season
- Avg overnight low
- 11°C
- Rainfall
- 53 mm
- 10 wet days
- Avg wind
- 8 km/h
- Travel score
- 7.7
- 2nd-best season
- Months
- Mar · Apr · May
Temperature in San Juan in Fall
Over the season highs ease from about 30°C in early March to 19°C by late May.
A typical fall day in San Juan reaches about 24°C and drops to 11°C overnight. The warmest of the three months is March, the coolest May.
How fall really feels in San Juan
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
fall sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
San Juan weather by month
How the three fall months (March, April and May) 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 Fall
The sky is clear or mostly clear about 63% of the time across fall.
Chance of precipitation in Fall
San Juan gets around 53 mm of rain over 10 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 8 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 42 min in early March to 10 h 06 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.6 kWh/m².
Is fall a good time to visit San Juan?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is one of the better times to visit San Juan for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for San Juan in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, San Juan sees daytime highs around 24°C and nights near 11°C. Pack light clothes. Worth having: a warm layer and sun protection. About 10 days see rain.
UV index in San Juan in Fall
Clear-sky midday UV across fall averages around 7 — 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.