Climate averages 1991–2020
Posadas weather
in September.
A warm, wet month: the 8th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Posadas: daytime highs average 24.3°C and nights cool to about 15.0°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 147 mm of rain on roughly 10 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 55 min on an average September day.
The nearest other city in this atlas is Encarnación (9 km away). In September its highs average 24.5°C, about as warm as Posadas, with 151 mm of rain.
Among the 67 cities listed in Argentina, Posadas ranks 6th of 67 for the warmest September highs and 67th of 67 for the driest September (rainfall, lowest first). The mean September high of those 67 cities is 19.4°C; Posadas is 4.9°C warmer than that mean.
From September to October, average highs rise by 2.3°C to 26.6°C, and monthly rainfall rises from 147 mm to 216 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
Posadas climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.0°C22.7°C | 22.7°C | 133 | 12.6 | 13.714 h |
| February | 30.1°C22.2°C | 22.2°C | 130 | 11.9 | 13.013 h |
| March | 29.0°C20.9°C | 20.9°C | 121 | 10.5 | 12.312 h |
| April | 26.1°C18.1°C | 18.1°C | 159 | 9.9 | 11.511 h |
| May | 22.1°C14.8°C | 14.8°C | 143 | 9.1 | 10.811 h |
| June | 20.4°C13.3°C | 13.3°C | 121 | 8.9 | 10.410 h |
| July | 19.9°C12.0°C | 12.0°C | 117 | 9.1 | 10.611 h |
| August | 22.5°C13.4°C | 13.4°C | 90 | 7.9 | 11.111 h |
| September, selected | 24.3°C15.0°C | 15.0°C | 147 | 9.8 | 11.912 h |
| October | 26.6°C17.8°C | 17.8°C | 216 | 12.4 | 12.713 h |
| November | 28.2°C19.1°C | 19.1°C | 156 | 10.4 | 13.413 h |
| December | 30.3°C21.5°C | 21.5°C | 163 | 11.7 | 13.814 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
- Encarnación in SeptemberParaguay · 9 kmHigh 24.5°C · Low 15.0°C · 151 mm rain
- Ituzaingó in SeptemberArgentina · 78 kmHigh 24.0°C · Low 15.3°C · 139 mm rain
- Santa Rosa, Brazil in SeptemberBrazil · 152 kmHigh 23.4°C · Low 13.8°C · 152 mm rain
- Santo Ângelo in SeptemberBrazil · 192 kmHigh 22.8°C · Low 12.9°C · 159 mm rain
- Ijuí in SeptemberBrazil · 226 kmHigh 22.5°C · Low 12.8°C · 157 mm rain
- Foz do Iguaçu in SeptemberBrazil · 244 kmHigh 26.4°C · Low 16.7°C · 155 mm rain
- Ciudad del Este in SeptemberParaguay · 245 kmHigh 26.3°C · Low 16.7°C · 157 mm rain
- Formosa, Argentina in SeptemberArgentina · 260 kmHigh 25.8°C · Low 15.9°C · 110 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 Posadas) is explained once on the Posadas year overview and on the Sources, method and limits page.