Monthly climate guide
Chillán weather in September
Expect mild weather in Chillán in September: afternoons reach about 18°C (64°F), while nights drop to around 6°C (42°F). Around 55 mm of rain falls over the month (some rain), and skies are a mix of sun and cloud. Daytime highs are 3°C warmer than August and 3°C cooler than October.
What stands out in September
- Just 90 km apart, but Chillán runs about 3°C warmer than Concepción this month.
- Evenings cool off sharply: the daily range is around 12°C, so pack a layer.
- In Chillán, September is early spring — the seasons are reversed south of the equator.
Avg high
18°C
64°F
Avg low
6°C
42°F
Rainfall
55 mm
some rain
Humidity
73%
relative
Sky
52%
cloud · a mix of sun and cloud
Chillán weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 32°C / 90°F | 14°C / 57°F | 10 mm | 42% | 23% |
| February | 32°C / 89°F | 14°C / 57°F | 14 mm | 42% | 22% |
| March | 29°C / 83°F | 12°C / 53°F | 18 mm | 44% | 26% |
| April | 23°C / 74°F | 9°C / 48°F | 39 mm | 56% | 44% |
| May | 18°C / 65°F | 7°C / 45°F | 62 mm | 69% | 63% |
| June | 14°C / 57°F | 5°C / 41°F | 109 mm | 77% | 64% |
| July | 13°C / 56°F | 4°C / 39°F | 84 mm | 78% | 63% |
| August | 14°C / 58°F | 4°C / 40°F | 84 mm | 77% | 61% |
| September | 18°C / 64°F | 6°C / 42°F | 55 mm | 73% | 52% |
| October | 20°C / 68°F | 7°C / 44°F | 38 mm | 68% | 45% |
| November | 25°C / 77°F | 9°C / 48°F | 24 mm | 58% | 32% |
| December | 29°C / 85°F | 11°C / 53°F | 13 mm | 47% | 25% |
What to pack for September
- A warm sweater or fleece for layering
- A mid-weight jacket
- An extra layer — evenings are noticeably cooler than afternoons
- A small travel umbrella, just in case
Is September a good time to visit Chillán?
Compare the months in the chart above to find your ideal window.
Best time to visit Chillán →Other Chile cities in September
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Chillán weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/chile/chillan/september
<a href="https://weathercompare.eu/weather/chile/chillan/september">Chillán weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/chile/chillan" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Chillán weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/chile/chillan/september">Chillán weather in September</a> – WeatherCompare</p>
Chillán in September: quick answers
Is September a good time to visit Chillán?
September is a reasonable time for Chillán: highs around 18°C and about 55 mm of rain, though not one of the three best months.
How warm is Chillán in September?
Average highs are about 18°C (64°F) and average lows about 6°C (42°F), based on 10 years of daily data.
Does it rain a lot in Chillán in September?
Chillán typically gets around 55 mm of rain in September — some rain.
Figures are long-term averages for the area around Chillán (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.