Climate averages 1991–2020
Chillán weather
in September.
A mild, wet month: the 8th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Chillán: daytime highs average 16.3°C and nights cool to about 5.4°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 96 mm of rain on roughly 7 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 50 min on an average September day.
The nearest other city in this atlas is Concepción (88 km away). In September its highs average 15.4°C, 0.9°C cooler than Chillán, with 62 mm of rain.
Among the 40 cities listed in Chile, Chillán ranks joint 24th of 40 for the warmest September highs and 34th of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 17.2°C; Chillán is 0.8°C cooler than that mean.
From September to October, average highs rise by 2.4°C to 18.7°C, and monthly rainfall falls from 96 mm to 63 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Chillán climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.6°C13.3°C | 13.3°C | 9.5 | 1.3 | 14.314 h |
| February | 27.1°C13.1°C | 13.1°C | 24 | 1.8 | 13.513 h |
| March | 24.7°C11.4°C | 11.4°C | 23 | 2.4 | 12.312 h |
| April | 19.8°C8.6°C | 8.6°C | 75 | 5.2 | 11.211 h |
| May | 15.8°C6.5°C | 6.5°C | 193 | 9.7 | 10.210 h |
| June | 13.1°C5.0°C | 5.0°C | 267 | 13.4 | 9.710 h |
| July | 12.7°C3.5°C | 3.5°C | 203 | 11.4 | 9.910 h |
| August | 14.0°C4.2°C | 4.2°C | 168 | 11.4 | 10.711 h |
| September, selected | 16.3°C5.4°C | 5.4°C | 96 | 7.3 | 11.812 h |
| October | 18.7°C7.1°C | 7.1°C | 63 | 6.4 | 13.013 h |
| November | 22.2°C9.3°C | 9.3°C | 28 | 3.3 | 14.014 h |
| December | 25.4°C11.6°C | 11.6°C | 22 | 2.4 | 14.615 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Concepción in SeptemberChile · 88 kmHigh 15.4°C · Low 6.8°C · 62 mm rain
- Villa Mercedes, Chile in SeptemberChile · 89 kmHigh 14.5°C · Low 4.5°C · 145 mm rain
- Chiguayante in SeptemberChile · 90 kmHigh 15.6°C · Low 6.7°C · 84 mm rain
- Talcahuano in SeptemberChile · 91 kmHigh 14.6°C · Low 7.5°C · 62 mm rain
- San Pedro de la Paz in SeptemberChile · 93 kmHigh 14.8°C · Low 7.3°C · 62 mm rain
- Los Ángeles in SeptemberChile · 99 kmHigh 15.3°C · Low 5.2°C · 94 mm rain
- Coronel in SeptemberChile · 104 kmHigh 15.3°C · Low 7.0°C · 84 mm rain
- Talca in SeptemberChile · 138 kmHigh 17.5°C · Low 6.1°C · 62 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Chillán) is explained once on the Chillán year overview and on the Sources, method and limits page.