Climate averages 1991–2020
Calama weather
in September.
A warm, very dry month: the 8th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Calama: daytime highs average 23.3°C and nights cool to about 3.3°C. By daytime temperature it is the 8th warmest of the 12 months.
Rain is very rare: less than 1 mm falls in a typical September (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 57 min on an average September day.
The nearest other city in this atlas is Antofagasta (201 km away). In September its highs average 18.5°C, 4.7°C cooler than Calama, with 5.2 mm of rain.
Among the 40 cities listed in Chile, Calama ranks 2nd of 40 for the warmest September highs and 2nd of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 17.2°C; Calama is 6.1°C warmer than that mean.
From September to October, average highs rise by 1.3°C to 24.5°C, and monthly rainfall stays 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
Calama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 24.8°C9.5°C | 9.5°C | 8.7 | 2.3 | 13.313 h |
| February | 24.6°C9.4°C | 9.4°C | 11 | 2.7 | 12.913 h |
| March | 24.5°C7.7°C | 7.7°C | 5.6 | 1.0 | 12.212 h |
| April | 23.6°C5.0°C | 5.0°C | 2.0 | 0.3 | 11.612 h |
| May | 21.8°C2.8°C | 2.8°C | 4.5 | 0.5 | 11.111 h |
| June | 20.6°C1.6°C | 1.6°C | 3.5 | 0.3 | 10.811 h |
| July | 20.3°C1.3°C | 1.3°C | 3.3 | 0.6 | 10.911 h |
| August | 21.9°C2.0°C | 2.0°C | 2.5 | 0.4 | 11.311 h |
| September, selected | 23.3°C3.3°C | 3.3°C | 0.6 | 0.2 | 11.912 h |
| October | 24.5°C4.9°C | 4.9°C | 0.1 | 0.1 | 12.613 h |
| November | 25.0°C5.8°C | 5.8°C | 0.1 | 0.0 | 13.213 h |
| December | 25.2°C7.5°C | 7.5°C | 1.3 | 0.3 | 13.513 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
- Antofagasta in SeptemberChile · 201 kmHigh 18.5°C · Low 11.7°C · 5.2 mm rain
- Alto Hospicio in SeptemberChile · 272 kmHigh 20.2°C · Low 10.9°C · 0.2 mm rain
- Iquique (approximate) in SeptemberChile · 280 kmHigh 22.8°C · Low 14.4°C · 5.6 mm rain
- Tarija in SeptemberBolivia · 444 kmHigh 22.0°C · Low 8.5°C · 34 mm rain
- Potosí in SeptemberBolivia · 459 kmHigh 15.7°C · Low 0.1°C · 26 mm rain
- Arica in SeptemberChile · 465 kmHigh 18.1°C · Low 12.8°C · 14 mm rain
- San Ramón de la Nueva Orán in SeptemberArgentina · 477 kmHigh 28.0°C · Low 15.2°C · 16 mm rain
- Tacna in SeptemberPeru · 513 kmHigh 20.5°C · Low 13.1°C · 2.4 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 Calama) is explained once on the Calama year overview and on the Sources, method and limits page.