Climate averages 1991–2020
Copiapó weather
in September.
A warm, very dry month: the 8th warmest and the 6th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Copiapó: daytime highs average 25.2°C and nights cool to about 13.3°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 1.8 mm of rain on fewer than one day, which makes September a very dry month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 55 min on an average September day.
The nearest other city in this atlas is La Serena (296 km away). In September its highs average 20.5°C, 4.7°C cooler than Copiapó, with 5.4 mm of rain.
Among the 40 cities listed in Chile, Copiapó ranks 1st of 40 for the warmest September highs and 3rd of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 17.2°C; Copiapó is 8.1°C warmer than that mean.
From September to October, average highs rise by 1.4°C to 26.6°C, and monthly rainfall falls from 1.8 mm to under 1 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
Copiapó climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.4°C18.2°C | 18.2°C | 0.2 | 0.0 | 13.714 h |
| February | 29.4°C18.4°C | 18.4°C | 0.3 | 0.1 | 13.013 h |
| March | 28.5°C18.1°C | 18.1°C | 4.5 | 0.3 | 12.312 h |
| April | 26.6°C16.5°C | 16.5°C | 2.1 | 0.3 | 11.511 h |
| May | 24.7°C13.3°C | 13.3°C | 7.7 | 1.0 | 10.811 h |
| June | 23.4°C10.4°C | 10.4°C | 6.2 | 0.8 | 10.410 h |
| July | 23.0°C9.1°C | 9.1°C | 5.8 | 1.1 | 10.611 h |
| August | 24.2°C11.2°C | 11.2°C | 3.0 | 0.6 | 11.211 h |
| September, selected | 25.2°C13.3°C | 13.3°C | 1.8 | 0.4 | 11.912 h |
| October | 26.6°C15.1°C | 15.1°C | 0.4 | 0.2 | 12.713 h |
| November | 27.7°C16.1°C | 16.1°C | 0.1 | 0.1 | 13.413 h |
| December | 28.6°C17.0°C | 17.0°C | 0.5 | 0.1 | 13.814 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
- La Serena in SeptemberChile · 296 kmHigh 20.5°C · Low 12.4°C · 5.4 mm rain
- Coquimbo in SeptemberChile · 304 kmHigh 19.3°C · Low 11.7°C · 5.4 mm rain
- Ovalle in SeptemberChile · 369 kmHigh 22.8°C · Low 10.3°C · 7.9 mm rain
- Antofagasta in SeptemberChile · 413 kmHigh 18.5°C · Low 11.7°C · 5.2 mm rain
- Catamarca in SeptemberArgentina · 463 kmHigh 24.2°C · Low 12.3°C · 32 mm rain
- San Juan, Argentina in SeptemberArgentina · 496 kmHigh 21.8°C · Low 8.0°C · 17 mm rain
- Rawson in SeptemberArgentina · 500 kmHigh 21.5°C · Low 7.3°C · 17 mm rain
- Calama in SeptemberChile · 564 kmHigh 23.3°C · Low 3.3°C · 0.6 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 Copiapó) is explained once on the Copiapó year overview and on the Sources, method and limits page.