Santiago in Fall
In fall (September, October and November), Santiago sees average daytime highs around 23°C and overnight lows near 14°C, with 363 mm of rain over about 37 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 27°C in early September to 19°C by late November. The sky is clear or mostly clear about 44% of the time across fall, and the air most often feels dry.
Fall is Santiago's best 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
- 23°C
- 3rd-warmest season
- Avg overnight low
- 14°C
- Rainfall
- 363 mm
- 37 wet days
- Avg wind
- 5 km/h
- Travel score
- 6.5
- best season of the year
- Months
- Sep · Oct · Nov
Temperature in Santiago in Fall
Over the season highs ease from about 27°C in early September to 19°C by late November.
A typical fall day in Santiago reaches about 23°C and drops to 14°C overnight. The warmest of the three months is September, the coolest November.
Santiago weather by month
How the three fall months (September, October and November) 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 Fall
The sky is clear or mostly clear about 44% of the time across fall.
Chance of precipitation in Fall
Santiago gets around 363 mm of rain over 37 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 5 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 30 min in early September to 10 h 30 min by late November. 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 4.7 kWh/m².
Is fall a good time to visit Santiago?
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 Santiago for sightseeing.
What to pack for Santiago in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Santiago sees daytime highs around 23°C and nights near 14°C. Pack rain gear. Worth having: light clothes and sun protection. About 37 days see rain.
UV index in Santiago in Fall
Clear-sky midday UV across fall averages around 8 — enough to warrant sun protection. 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 Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall 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.