San Isidro in Summer
In summer (December, January and February), San Isidro sees average daytime highs around 26°C and overnight lows near 16°C, with 414 mm of rain over about 46 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 26°C. The sky is clear or mostly clear about 31% of the time across summer, and the air most often feels comfortable.
Summer is San Isidro's weakest season of the year to visit on our travel score. For the whole year in context, see San Isidro's year-round climate.
- Avg daytime high
- 26°C
- warmest season of the year
- Avg overnight low
- 16°C
- Rainfall
- 414 mm
- 46 wet days
- Avg wind
- 7 km/h
- Travel score
- 5.9
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in San Isidro in Summer
Across summer, daytime highs hold fairly steady around 26°C.
A typical summer day in San Isidro reaches about 26°C and drops to 16°C overnight. The warmest of the three months is January, the coolest February.
San Isidro weather by month
How the three summer months (December, January and February) 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 Summer
The sky is clear or mostly clear about 31% of the time across summer.
Chance of precipitation in Summer
San Isidro gets around 414 mm of rain over 46 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 42 min in early December to 12 h 42 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.2 kWh/m².
Hazard calendar for San Isidro
In summer, 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 summer a good time to visit San Isidro?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit San Isidro for sightseeing.
What to pack for San Isidro in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, San Isidro sees daytime highs around 26°C and nights near 16°C. Pack rain gear and sun protection. Worth having: light clothes. About 46 days see rain.
UV index in San Isidro in Summer
Clear-sky midday UV across summer averages around 14 (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.