Climate averages 1991–2020
Arica weather
in September.
A mild, very dry month: the 9th warmest and the 8th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Arica: daytime highs average 18.1°C and nights cool to about 12.8°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 14 mm of rain on roughly 5 days, which makes September a very dry month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 59 min on an average September day.
The nearest other city in this atlas is Tacna (51 km away). In September its highs average 20.5°C, 2.4°C warmer than Arica, with 2.4 mm of rain.
Among the 40 cities listed in Chile, Arica ranks 15th of 40 for the warmest September highs and 9th of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 17.2°C; Arica is 1.0°C warmer than that mean.
From September to October, average highs rise by 1.6°C to 19.7°C, and monthly rainfall falls from 14 mm to 8.9 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
Arica climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.6°C19.5°C | 19.5°C | 9.5 | 2.4 | 13.113 h |
| February | 27.3°C20.2°C | 20.2°C | 7.3 | 2.0 | 12.713 h |
| March | 26.6°C19.2°C | 19.2°C | 3.8 | 0.7 | 12.212 h |
| April | 23.6°C16.7°C | 16.7°C | 6.9 | 1.7 | 11.712 h |
| May | 20.1°C14.9°C | 14.9°C | 24 | 9.3 | 11.311 h |
| June | 18.0°C13.5°C | 13.5°C | 30 | 12.5 | 11.011 h |
| July | 17.1°C12.5°C | 12.5°C | 29 | 10.5 | 11.111 h |
| August | 17.2°C12.3°C | 12.3°C | 20 | 6.9 | 11.511 h |
| September, selected | 18.1°C12.8°C | 12.8°C | 14 | 4.5 | 12.012 h |
| October | 19.7°C13.6°C | 13.6°C | 8.9 | 1.9 | 12.513 h |
| November | 22.3°C15.0°C | 15.0°C | 4.2 | 0.3 | 13.013 h |
| December | 24.7°C17.2°C | 17.2°C | 4.7 | 0.8 | 13.213 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
- Tacna in SeptemberPeru · 51 kmHigh 20.5°C · Low 13.1°C · 2.4 mm rain
- Iquique (approximate) in SeptemberChile · 194 kmHigh 22.8°C · Low 14.4°C · 5.6 mm rain
- Alto Hospicio in SeptemberChile · 200 kmHigh 20.2°C · Low 10.9°C · 0.2 mm rain
- Viacha in SeptemberBolivia · 294 kmHigh 15.2°C · Low 0.7°C · 32 mm rain
- Puno in SeptemberPeru · 295 kmHigh 15.8°C · Low 2.2°C · 51 mm rain
- La Paz in SeptemberBolivia · 317 kmHigh 14.3°C · Low 2.4°C · 36 mm rain
- Juliaca in SeptemberPeru · 331 kmHigh 15.9°C · Low 1.1°C · 46 mm rain
- Oruro in SeptemberBolivia · 343 kmHigh 15.6°C · Low -0.1°C · 21 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 Arica) is explained once on the Arica year overview and on the Sources, method and limits page.