Climate averages 1991–2020
San Antonio, Chile weather
in September.
A mild, fairly dry 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 San Antonio, Chile: daytime highs average 15.8°C and nights cool to about 8.6°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 28 mm of rain on roughly 3 days, which makes September a fairly dry 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 Valparaíso (62 km away). In September its highs average 15.6°C, about as warm as San Antonio, Chile, with 27 mm of rain.
Among the 40 cities listed in Chile, San Antonio, Chile ranks 26th of 40 for the warmest September highs and 13th of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 17.2°C; San Antonio, Chile is 1.3°C cooler than that mean.
From September to October, average highs rise by 1.5°C to 17.3°C, and monthly rainfall falls from 28 mm to 14 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
San Antonio, Chile climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.6°C14.5°C | 14.5°C | 0.4 | 0.1 | 14.114 h |
| February | 21.4°C14.4°C | 14.4°C | 1.6 | 0.3 | 13.313 h |
| March | 20.9°C13.4°C | 13.4°C | 3.5 | 0.8 | 12.312 h |
| April | 18.9°C11.3°C | 11.3°C | 18 | 2.1 | 11.311 h |
| May | 16.6°C9.6°C | 9.6°C | 61 | 4.7 | 10.410 h |
| June | 14.7°C8.0°C | 8.0°C | 122 | 7.0 | 10.010 h |
| July | 14.0°C6.9°C | 6.9°C | 67 | 5.6 | 10.110 h |
| August | 14.7°C7.4°C | 7.4°C | 59 | 5.1 | 10.911 h |
| September, selected | 15.8°C8.6°C | 8.6°C | 28 | 3.0 | 11.912 h |
| October | 17.3°C10.0°C | 10.0°C | 14 | 1.8 | 12.913 h |
| November | 19.1°C11.7°C | 11.7°C | 3.5 | 0.7 | 13.814 h |
| December | 20.4°C13.2°C | 13.2°C | 2.9 | 0.4 | 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
- Valparaíso in SeptemberChile · 62 kmHigh 15.6°C · Low 10.8°C · 27 mm rain
- Quilpué in SeptemberChile · 63 kmHigh 17.4°C · Low 8.3°C · 24 mm rain
- Viña del Mar in SeptemberChile · 64 kmHigh 17.3°C · Low 9.2°C · 24 mm rain
- Peñaflor in SeptemberChile · 68 kmHigh 19.0°C · Low 6.2°C · 41 mm rain
- Lampa in SeptemberChile · 76 kmHigh 19.5°C · Low 8.1°C · 39 mm rain
- Maipú in SeptemberChile · 79 kmHigh 18.4°C · Low 5.9°C · 55 mm rain
- Paine in SeptemberChile · 84 kmHigh 19.0°C · Low 5.8°C · 57 mm rain
- San Bernardo in SeptemberChile · 84 kmHigh 18.4°C · Low 4.8°C · 55 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 San Antonio) is explained once on the San Antonio, Chile year overview and on the Sources, method and limits page.