Climate averages 1991–2020
Puente Alto weather
in September.
A mild, moderately wet month: the 9th 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 Puente Alto: daytime highs average 17.2°C and nights cool to about 3.8°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 72 mm of rain on roughly 9 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 51 min on an average September day.
The nearest other city in this atlas is San Bernardo (12 km away). In September its highs average 18.4°C, 1.2°C warmer than Puente Alto, with 55 mm of rain.
Among the 40 cities listed in Chile, Puente Alto ranks 23rd of 40 for the warmest September highs and joint 26th of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 17.2°C; Puente Alto is level with that mean.
From September to October, average highs rise by 2.5°C to 19.7°C, and monthly rainfall falls from 72 mm to 62 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
Puente Alto climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.7°C15.8°C | 15.8°C | 15 | 3.9 | 14.114 h |
| February | 27.1°C15.3°C | 15.3°C | 14 | 4.1 | 13.313 h |
| March | 25.7°C13.6°C | 13.6°C | 15 | 2.8 | 12.312 h |
| April | 21.8°C8.8°C | 8.8°C | 39 | 4.6 | 11.311 h |
| May | 17.9°C5.0°C | 5.0°C | 79 | 7.2 | 10.410 h |
| June | 14.2°C1.6°C | 1.6°C | 129 | 8.6 | 10.010 h |
| July | 13.3°C0.6°C | 0.6°C | 97 | 8.1 | 10.110 h |
| August | 14.9°C1.7°C | 1.7°C | 90 | 7.7 | 10.911 h |
| September, selected | 17.2°C3.8°C | 3.8°C | 72 | 9.0 | 11.912 h |
| October | 19.7°C6.4°C | 6.4°C | 62 | 11.0 | 12.913 h |
| November | 23.0°C9.5°C | 9.5°C | 45 | 10.3 | 13.814 h |
| December | 25.9°C13.2°C | 13.2°C | 25 | 6.7 | 14.314 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
- San Bernardo in SeptemberChile · 12 kmHigh 18.4°C · Low 4.8°C · 55 mm rain
- Peñalolén in SeptemberChile · 16 kmHigh 16.3°C · Low 4.9°C · 72 mm rain
- Santiago in SeptemberChile · 18 kmHigh 17.6°C · Low 5.0°C · 55 mm rain
- Maipú in SeptemberChile · 21 kmHigh 18.4°C · Low 5.9°C · 55 mm rain
- Paine in SeptemberChile · 27 kmHigh 19.0°C · Low 5.8°C · 57 mm rain
- Peñaflor in SeptemberChile · 28 kmHigh 19.0°C · Low 6.2°C · 41 mm rain
- Quilicura in SeptemberChile · 30 kmHigh 18.0°C · Low 6.4°C · 77 mm rain
- Lampa in SeptemberChile · 46 kmHigh 19.5°C · Low 8.1°C · 39 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 Puente Alto) is explained once on the Puente Alto year overview and on the Sources, method and limits page.
Peñalolén lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.