Climate averages 1991–2020
La Serena 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 La Serena: daytime highs average 20.5°C and nights cool to about 12.4°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 5.4 mm of rain on fewer than one day, which makes September a very dry month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 53 min on an average September day.
The nearest other city in this atlas is Coquimbo (10 km away). In September its highs average 19.3°C, 1.2°C cooler than La Serena, with 5.4 mm of rain.
Among the 40 cities listed in Chile, La Serena ranks 5th of 40 for the warmest September highs and joint 5th of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 17.2°C; La Serena is 3.4°C warmer than that mean.
From September to October, average highs rise by 1.6°C to 22.1°C, and monthly rainfall falls from 5.4 mm to 4.7 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
La Serena climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.8°C18.0°C | 18.0°C | 0.2 | 0.1 | 13.814 h |
| February | 25.7°C18.2°C | 18.2°C | 0.5 | 0.0 | 13.213 h |
| March | 24.8°C17.7°C | 17.7°C | 4.5 | 0.5 | 12.312 h |
| April | 22.7°C16.2°C | 16.2°C | 3.0 | 0.7 | 11.411 h |
| May | 20.8°C14.5°C | 14.5°C | 20 | 2.1 | 10.611 h |
| June | 19.2°C12.1°C | 12.1°C | 30 | 2.3 | 10.310 h |
| July | 18.7°C10.5°C | 10.5°C | 15 | 1.9 | 10.410 h |
| August | 19.4°C11.2°C | 11.2°C | 15 | 1.9 | 11.011 h |
| September, selected | 20.5°C12.4°C | 12.4°C | 5.4 | 0.9 | 11.912 h |
| October | 22.1°C13.7°C | 13.7°C | 4.7 | 0.6 | 12.813 h |
| November | 23.6°C15.2°C | 15.2°C | 0.6 | 0.1 | 13.614 h |
| December | 24.6°C16.6°C | 16.6°C | 0.5 | 0.1 | 14.014 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
- Coquimbo in SeptemberChile · 10 kmHigh 19.3°C · Low 11.7°C · 5.4 mm rain
- Ovalle in SeptemberChile · 77 kmHigh 22.8°C · Low 10.3°C · 7.9 mm rain
- Copiapó in SeptemberChile · 296 kmHigh 25.2°C · Low 13.3°C · 1.8 mm rain
- San Juan, Argentina in SeptemberArgentina · 317 kmHigh 21.8°C · Low 8.0°C · 17 mm rain
- Rawson in SeptemberArgentina · 319 kmHigh 21.5°C · Low 7.3°C · 17 mm rain
- Viña del Mar in SeptemberChile · 348 kmHigh 17.3°C · Low 9.2°C · 24 mm rain
- Quilpué in SeptemberChile · 350 kmHigh 17.4°C · Low 8.3°C · 24 mm rain
- Valparaíso in SeptemberChile · 350 kmHigh 15.6°C · Low 10.8°C · 27 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 La Serena) is explained once on the La Serena year overview and on the Sources, method and limits page.
Coquimbo lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.