Climate averages 1991–2020
Posadas weather
by month.
See how the year changes. January has the highest average daily maximum; August has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: August
Long-term climate patterns, not a forecast for a particular trip.
Across the year Posadas averages a daytime high of 25.9°C and a nighttime low of 17.6°C, with about 1,695 mm of rain on roughly 124 days. January is the warmest month (average high 31.0°C) and July the coolest (19.9°C). October is the wettest month with 216 mm; August is the driest with 90 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): August. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Posadas
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 | 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
Nearby cities
- EncarnaciónParaguay · 9 kmHigh 26.0°C · Low 17.5°C · 1,796 mm rain a year
- ItuzaingóArgentina · 78 kmHigh 25.9°C · Low 18.1°C · 1,669 mm rain a year
- Santa Rosa, BrazilBrazil · 152 kmHigh 25.1°C · Low 16.2°C · 1,770 mm rain a year
- Santo ÂngeloBrazil · 192 kmHigh 24.6°C · Low 15.4°C · 1,918 mm rain a year
- IjuíBrazil · 226 kmHigh 24.3°C · Low 15.2°C · 1,899 mm rain a year
- Foz do IguaçuBrazil · 244 kmHigh 26.9°C · Low 18.7°C · 1,792 mm rain a year
- Ciudad del EsteParaguay · 245 kmHigh 26.9°C · Low 18.7°C · 1,825 mm rain a year
- Formosa, ArgentinaArgentina · 260 kmHigh 27.0°C · Low 18.4°C · 1,543 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-3, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at -27.40°, -55.90° (3 km from the city centre). Rain comes from the 0.25° cell at -27.50°, -56.00°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.