Asunción weather by month
Asunción runs from about 17°C in July to 29°C in March, with April the wettest month at 215 mm.
warmest month
March
29°C
coolest month
July
17°C
wettest month
April
215 mm
worst air month
February
13 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 28°C | 76 mm | 383 h | 9 |
| February | 29°C | 79 mm | 324 h | 13 |
| March | 29°C | 67 mm | 342 h | 11 |
| April | 26°C | 215 mm | 266 h | 10 |
| May | 19°C | 159 mm | 203 h | 9 |
| June | 22°C | 130 mm | 245 h | 10 |
| July | 17°C | 77 mm | 240 h | 11 |
| August | 19°C | 60 mm | 280 h | 11 |
| September | 23°C | 42 mm | 306 h | 8 |
| October | 25°C | 105 mm | 317 h | 8 |
| November | 28°C | 143 mm | 325 h | 8 |
| December | 26°C | 213 mm | 336 h | 9 |
About 3,567 hours of sun a year. Roughly 138 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.