Climate averages 1991–2020
Osorno weather
in September.
A cool, 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 cool month in Osorno: daytime highs average 12.9°C and nights cool to about 4.5°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 129 mm of rain on roughly 14 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 47 min on an average September day.
The nearest other city in this atlas is Valdivia (85 km away). In September its highs average 13.2°C, about as warm as Osorno, with 153 mm of rain.
Among the 40 cities listed in Chile, Osorno ranks 38th of 40 for the warmest September highs and 37th of 40 for the driest September (rainfall, lowest first). The mean September high of those 40 cities is 17.2°C; Osorno is 4.3°C cooler than that mean.
From September to October, average highs rise by 1.8°C to 14.7°C, and monthly rainfall falls from 129 mm to 114 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
Osorno climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.5°C11.0°C | 11.0°C | 39 | 6.2 | 14.715 h |
| February | 22.0°C11.1°C | 11.1°C | 42 | 5.3 | 13.714 h |
| March | 19.6°C9.7°C | 9.7°C | 65 | 8.5 | 12.412 h |
| April | 15.9°C7.4°C | 7.4°C | 114 | 11.6 | 11.011 h |
| May | 13.2°C6.1°C | 6.1°C | 194 | 15.4 | 9.910 h |
| June | 10.7°C4.5°C | 4.5°C | 251 | 18.8 | 9.39 h |
| July | 10.3°C3.4°C | 3.4°C | 231 | 17.9 | 9.610 h |
| August | 11.2°C3.8°C | 3.8°C | 213 | 18.6 | 10.511 h |
| September, selected | 12.9°C4.5°C | 4.5°C | 129 | 14.0 | 11.812 h |
| October | 14.7°C5.9°C | 5.9°C | 114 | 13.6 | 13.113 h |
| November | 16.7°C7.7°C | 7.7°C | 77 | 10.6 | 14.414 h |
| December | 19.2°C9.6°C | 9.6°C | 67 | 8.2 | 15.015 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
- Valdivia in SeptemberChile · 85 kmHigh 13.2°C · Low 6.0°C · 153 mm rain
- Puerto Montt in SeptemberChile · 101 kmHigh 12.0°C · Low 5.5°C · 185 mm rain
- San Carlos de Bariloche in SeptemberArgentina · 166 kmHigh 7.2°C · Low 0.8°C · 68 mm rain
- Padre Las Casas in SeptemberChile · 207 kmHigh 14.0°C · Low 4.4°C · 113 mm rain
- Temuco in SeptemberChile · 209 kmHigh 14.3°C · Low 4.7°C · 113 mm rain
- Los Ángeles in SeptemberChile · 352 kmHigh 15.3°C · Low 5.2°C · 94 mm rain
- Villa Mercedes, Chile in SeptemberChile · 366 kmHigh 14.5°C · Low 4.5°C · 145 mm rain
- Coronel in SeptemberChile · 394 kmHigh 15.3°C · Low 7.0°C · 84 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 Osorno) is explained once on the Osorno year overview and on the Sources, method and limits page.