San Isidro in Fall
In fall (March, April and May), San Isidro sees average daytime highs around 21°C and overnight lows near 11°C, with 211 mm of rain over about 30 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 24°C in early March to 17°C by late May. The sky is clear or mostly clear about 38% of the time across fall, and the air most often feels dry.
Fall is San Isidro's 3rd-best season to visit on our travel score. For the whole year in context, see San Isidro's year-round climate.
- Avg daytime high
- 21°C
- 3rd-warmest season
- Avg overnight low
- 11°C
- Rainfall
- 211 mm
- 30 wet days
- Avg wind
- 7 km/h
- Travel score
- 6.5
- 3rd-best season
- Months
- Mar · Apr · May
Temperature in San Isidro in Fall
Over the season highs ease from about 24°C in early March to 17°C by late May.
A typical fall day in San Isidro reaches about 21°C and drops to 11°C overnight. The warmest of the three months is March, the coolest May.
San Isidro 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 | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 26° / 17° | 167 | 16.7 | 0 | 13.6 | 5.7 |
| Feb | 25° / 16° | 117 | 13.7 | 0 | 13 | 6.1 |
| Mar | 23° / 15° | 109 | 13.2 | 0 | 12.2 | 6.4 |
| Apr | 21° / 11° | 65 | 9.7 | 0.2 | 11.3 | 6.6 |
| May | 18° / 7° | 37 | 6.9 | 0.2 | 10.6 | 6.5 |
| Jun | 17° / 4° | 20 | 4.1 | 0.4 | 10.2 | 6.3 |
| Jul | 16° / 2° | 15 | 3.3 | 0.9 | 10.4 | 6.5 |
| Aug | 19° / 5° | 17 | 3.3 | 0.4 | 11 | 7.6 |
| Sep | 21° / 8° | 32 | 5.4 | 0.4 | 11.8 | 7.6 |
| Oct | 23° / 11° | 65 | 10 | 0 | 12.7 | 7.2 |
| Nov | 24° / 14° | 98 | 12.9 | 0 | 13.4 | 6.6 |
| Dec | 26° / 16° | 129 | 15.4 | 0 | 13.8 | 6.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 38% of the time across fall.
Chance of precipitation in Fall
San Isidro gets around 211 mm of rain over 30 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 7 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 36 min in early March to 10 h 18 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 4.1 kWh/m².
Hazard calendar for San Isidro
In fall, San Isidro overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
San Isidro's rainy season runs November–March, when most of the year's rain falls.
Is fall a good time to visit San Isidro?
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 a reasonable time to visit San Isidro for sightseeing.
What to pack for San Isidro in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, San Isidro sees daytime highs around 21°C and nights near 11°C. Worth packing: light clothes, a warm layer, rain gear and sun protection. About 30 days see rain.
UV index in San Isidro in Fall
Clear-sky midday UV across fall averages around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in San Isidro peaks around January 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 4 (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) | 15 | 14 | 12 | 7 | 5 | 4 | 4 | 6 | 8 | 12 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate | High | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 14 | Extreme |
| Mar | 12 | Extreme |
| Apr | 7 | Very high |
| May | 5 | High |
| Jun | 4 | Moderate |
| Jul | 4 | Moderate |
| Aug | 6 | High |
| Sep | 8 | Very high |
| Oct | 12 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Where is San Isidro?
San Isidro sits at 28.5°S, 65.7°W, 518 m above sea level, in Argentina. The nearest listed city is Catamarca, 6.0 km away.
Topography around San Isidro
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Isidro.
Within 3 km, the terrain around San Isidro has only modest variations in elevation — a maximum elevation change of 134 m around an average of 522 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,541 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,232 m.
The land around San Isidro is covered by artificial surfaces (33%), trees (24%) and shrubs (21%) within 3 km, trees (40%) and shrubs (38%) within 16 km, and shrubs (44%) and trees (24%) 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 Isidro (-28.4578°, -65.725°, elevation 518 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.