Santiago in Summer
In summer (June, July and August), Santiago sees average daytime highs around 28°C and overnight lows near 18°C, with 243 mm of rain over about 32 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.
Across summer, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 50% of the time across summer, and the air most often feels humid.
Summer is Santiago's weakest season of the year to visit on our travel score. For the whole year in context, see Santiago's year-round climate.
- Avg daytime high
- 28°C
- warmest season of the year
- Avg overnight low
- 18°C
- Rainfall
- 243 mm
- 32 wet days
- Avg wind
- 6 km/h
- Travel score
- 5.9
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Santiago in Summer
Across summer, daytime highs hold fairly steady around 28°C.
A typical summer day in Santiago reaches about 28°C and drops to 18°C overnight. The warmest of the three months is August, the coolest June.
Santiago weather by month
How the three summer 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 | 17° / 7° | 60 | 9.3 | 10.6 | 5.9 |
| Feb | 20° / 8° | 84 | 10.1 | 11.1 | 6.3 |
| Mar | 22° / 11° | 131 | 14.2 | 11.8 | 6.2 |
| Apr | 25° / 14° | 172 | 15.6 | 12.6 | 6.1 |
| May | 27° / 16° | 158 | 16 | 13.2 | 5.9 |
| Jun | 28° / 18° | 87 | 11 | 13.6 | 6.0 |
| Jul | 29° / 18° | 88 | 10.4 | 13.4 | 5.8 |
| Aug | 29° / 18° | 68 | 10.4 | 12.9 | 5.9 |
| Sep | 26° / 17° | 191 | 16.2 | 12.2 | 5.8 |
| Oct | 24° / 14° | 107 | 11.1 | 11.4 | 7.0 |
| Nov | 20° / 10° | 66 | 9.2 | 10.8 | 6.7 |
| Dec | 18° / 7° | 47 | 7.1 | 10.4 | 6.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 50% of the time across summer.
Chance of precipitation in Summer
Santiago gets around 243 mm of rain over 32 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 6 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 30 min in early June to 12 h 30 min by late August. 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 6.6 kWh/m².
Is summer a good time to visit Santiago?
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 Santiago for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Santiago in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Santiago sees daytime highs around 28°C and nights near 18°C. Pack light clothes and sun protection. Worth having: rain gear. About 32 days see rain.
UV index in Santiago in Summer
Clear-sky midday UV across summer averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Santiago peaks around June 21 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 5 (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) | 5 | 7 | 9 | 11 | 11 | 12 | 11 | 12 | 9 | 8 | 6 | 5 |
| Level | High | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | High |
| Feb | 7 | Very high |
| Mar | 9 | Very high |
| Apr | 11 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 11 | Extreme |
| Aug | 12 | Extreme |
| Sep | 9 | Very high |
| Oct | 8 | Very high |
| Nov | 6 | High |
| Dec | 5 | Moderate |
Air quality in Santiago in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Santiago is worst in December — around 24 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 23 | 21 | 24 | 21 | 22 | 20 | 19 | 18 | 20 | 20 | 22 | 24 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 23 | Moderate |
| Feb | 21 | Moderate |
| Mar | 24 | Moderate |
| Apr | 21 | Moderate |
| May | 22 | Moderate |
| Jun | 20 | Moderate |
| Jul | 19 | Moderate |
| Aug | 18 | Moderate |
| Sep | 20 | Moderate |
| Oct | 20 | Moderate |
| Nov | 22 | Moderate |
| Dec | 24 | Moderate |
Where is Santiago?
Santiago sits at 25.4°N, 100.2°W, 486 m above sea level, in Mexico. The nearest listed city is Ciudad de Allende, 21 km away.
Topography around Santiago
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Santiago.
Within 3 km, the terrain around Santiago has significant variations in elevation — a maximum elevation change of 452 m around an average of 513 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,598 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,555 m.
The land around Santiago is covered by trees (68%) within 3 km, trees (81%) within 16 km, and shrubs (47%) and trees (36%) within 80 km.
Mexico travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B
- 120 / 127 V · 60 Hz
- Prices
- ≈ 54% of US
- price level, 2025
- GDP per capita
- $13,889
- 2025
- Happiness
- 7.0 / 10
- World Happiness, 2025
- Safe drinking water
- 43%
- of population, 2024
- Homicide rate
- 24.9
- per 100k, 2023
- Road deaths
- 12.8
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Very low
- EF EPI 440
- 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 Santiago (25.426°, -100.154°, elevation 486 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.