Climate averages 1991–2020
Tacna weather
in September.
A mild, very dry month: the 9th warmest and the 4th 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 Tacna: daytime highs average 20.5°C and nights cool to about 13.1°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 2.4 mm of rain on fewer than one day, which makes September a very dry month (the 4th 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 Arica (51 km away). In September its highs average 18.1°C, 2.4°C cooler than Tacna, with 14 mm of rain.
Among the 24 cities listed in Peru, Tacna ranks 17th of 24 for the warmest September highs and 11th of 24 for the driest September (rainfall, lowest first). The mean September high of those 24 cities is 23.3°C; Tacna is 2.8°C cooler than that mean.
From September to October, average highs rise by 1.4°C to 21.9°C, and monthly rainfall falls from 2.4 mm to 1.1 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
Tacna climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.4°C17.9°C | 17.9°C | 23 | 6.5 | 13.113 h |
| February | 26.9°C18.5°C | 18.5°C | 23 | 6.9 | 12.713 h |
| March | 26.5°C18.0°C | 18.0°C | 14 | 4.1 | 12.212 h |
| April | 24.3°C16.3°C | 16.3°C | 1.9 | 0.4 | 11.712 h |
| May | 21.6°C15.0°C | 15.0°C | 4.1 | 0.4 | 11.311 h |
| June | 19.5°C13.8°C | 13.8°C | 4.5 | 0.4 | 11.111 h |
| July | 18.9°C13.0°C | 13.0°C | 3.9 | 0.5 | 11.211 h |
| August | 19.4°C12.9°C | 12.9°C | 3.6 | 0.5 | 11.512 h |
| September, selected | 20.5°C13.1°C | 13.1°C | 2.4 | 0.2 | 12.012 h |
| October | 21.9°C13.6°C | 13.6°C | 1.1 | 0.0 | 12.512 h |
| November | 23.7°C14.6°C | 14.6°C | 1.1 | 0.2 | 12.913 h |
| December | 25.3°C16.3°C | 16.3°C | 5.6 | 1.4 | 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
- Arica in SeptemberChile · 51 kmHigh 18.1°C · Low 12.8°C · 14 mm rain
- Puno in SeptemberPeru · 243 kmHigh 15.8°C · Low 2.2°C · 51 mm rain
- Iquique (approximate) in SeptemberChile · 245 kmHigh 22.8°C · Low 14.4°C · 5.6 mm rain
- Alto Hospicio in SeptemberChile · 251 kmHigh 20.2°C · Low 10.9°C · 0.2 mm rain
- Viacha in SeptemberBolivia · 257 kmHigh 15.2°C · Low 0.7°C · 32 mm rain
- La Paz in SeptemberBolivia · 280 kmHigh 14.3°C · Low 2.4°C · 36 mm rain
- Juliaca in SeptemberPeru · 280 kmHigh 15.9°C · Low 1.1°C · 46 mm rain
- Oruro in SeptemberBolivia · 334 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 Tacna) is explained once on the Tacna year overview and on the Sources, method and limits page.