WEATHER · CLIMATE NORMALS · 1991–2020
Asunción Climate — Averages by Month
What the weather in Asunción, PYaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | 27.9 °C · warmest | 126.8 mm |
| February | 27.1 °C | 146.6 mm |
| March | 26.0 °C | 123.6 mm |
| April | 23.3 °C | 157.8 mm |
| May | 19.4 °C | 139.9 mm |
| June | 18.1 °C | 103.7 mm |
| July | 17.3 °C · coldest | 77.1 mm |
| August | 19.3 °C | 65.8 mm |
| September | 21.4 °C | 108.9 mm |
| October | 24.1 °C | 187.1 mm |
| November | 25.1 °C | 193.8 mm · wettest |
| December | 27.0 °C | 165.1 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Asunción — centred at 25.25°S, 57.75°W. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.