Chillán Viejo in Fall
In fall (March, April and May), Chillán Viejo sees average daytime highs around 20°C and overnight lows near 9°C, with 239 mm of rain over about 18 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 26°C in early March to 14°C by late May. The sky is clear or mostly clear about 49% of the time across fall, and the air most often feels dry.
Fall is Chillán Viejo's 2nd-best season to visit on our travel score. For the whole year in context, see Chillán Viejo's year-round climate.
- Avg daytime high
- 20°C
- 2nd-warmest season
- Avg overnight low
- 9°C
- Rainfall
- 239 mm
- 18 wet days
- Avg wind
- 11 km/h
- Travel score
- 6.9
- 2nd-best season
- Months
- Mar · Apr · May
Temperature in Chillán Viejo in Fall
Over the season highs ease from about 26°C in early March to 14°C by late May.
A typical fall day in Chillán Viejo reaches about 20°C and drops to 9°C overnight. The warmest of the three months is March, the coolest May.
Chillán Viejo 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 | 27° / 13° | 8 | 1.1 | 14.2 | 8.6 |
| Feb | 27° / 12° | 18 | 1.6 | 13.4 | 8.6 |
| Mar | 24° / 11° | 21 | 2.7 | 12.3 | 8.7 |
| Apr | 20° / 8° | 60 | 5.2 | 11.1 | 7.1 |
| May | 15° / 7° | 157 | 9.6 | 10.1 | 4.8 |
| Jun | 13° / 6° | 214 | 13.3 | 9.5 | 3.2 |
| Jul | 13° / 4° | 159 | 11.7 | 9.8 | 3.3 |
| Aug | 14° / 5° | 132 | 11.3 | 10.6 | 4.1 |
| Sep | 16° / 6° | 72 | 6.9 | 11.8 | 5.6 |
| Oct | 19° / 8° | 49 | 6.5 | 12.9 | 6.8 |
| Nov | 22° / 9° | 25 | 3.1 | 14 | 8.2 |
| Dec | 25° / 11° | 16 | 2.4 | 14.5 | 8.7 |
Cloud cover in Fall
The sky is clear or mostly clear about 49% of the time across fall.
Chance of precipitation in Fall
Chillán Viejo gets around 239 mm of rain over 18 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 11 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 54 min in early March to 9 h 42 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 Chillán Viejo
In fall, Chillán Viejo overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Chillán Viejo's rainy season runs May–August, when most of the year's rain falls.
Is fall a good time to visit Chillán Viejo?
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 Chillán Viejo for sightseeing.
What to pack for Chillán Viejo in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Chillán Viejo sees daytime highs around 20°C and nights near 9°C. Worth packing: light clothes, a warm layer, rain gear and sun protection. About 18 days see rain.
UV index in Chillán Viejo in Fall
Clear-sky midday UV across fall averages around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Chillán Viejo peaks around January 14 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 16 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 13 | 11 | 9 | 5 | 3 | 2 | 3 | 3 | 5 | 8 | 10 | 12 |
| Level | Extreme | Extreme | Very high | Moderate | Moderate | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 11 | Extreme |
| Mar | 9 | Very high |
| Apr | 5 | Moderate |
| May | 3 | Moderate |
| Jun | 2 | Moderate |
| Jul | 3 | Moderate |
| Aug | 3 | Moderate |
| Sep | 5 | High |
| Oct | 8 | Very high |
| Nov | 10 | Extreme |
| Dec | 12 | Extreme |
Air quality in Chillán Viejo 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 Chillán Viejo is worst in April — around 40 µg/m³ PM2.5 (poor), about 4.6× the cleanest month (December, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 25 | 30 | 40 | 27 | 15 | 15 | 14 | 13 | 12 | 10 | 9 |
| Level | Moderate | Moderate | Moderate | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 25 | Moderate |
| Mar | 30 | Moderate |
| Apr | 40 | Poor |
| May | 27 | Moderate |
| Jun | 15 | Moderate |
| Jul | 15 | Moderate |
| Aug | 14 | Moderate |
| Sep | 13 | Moderate |
| Oct | 12 | Moderate |
| Nov | 10 | Good |
| Dec | 9 | Good |
Where is Chillán Viejo?
Chillán Viejo sits at 36.6°S, 72.1°W, 117 m above sea level, in Chile. The nearest listed city is Chillán, 3.0 km away.
Topography around Chillán Viejo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chillán Viejo.
Within 3 km, the terrain around Chillán Viejo has only modest variations in elevation — a maximum elevation change of 50 m around an average of 105 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 189 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,164 m.
The land around Chillán Viejo is covered by artificial surfaces (39%), grassland (25%) and cropland (20%) within 3 km, trees (33%), grassland (33%) and cropland (26%) within 16 km, and trees (50%) and grassland (26%) within 80 km.
Chile travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F / L
- 220 V · 50 Hz
- Prices
- ≈ 48% of US
- price level, 2025
- GDP per capita
- $17,995
- 2025
- Happiness
- 6.3 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 6.3
- per 100k, 2023
- Road deaths
- 14.9
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 517
- 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 Chillán Viejo (-36.623°, -72.1319°, elevation 117 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.