Colonia del Sacramento weather by month
Colonia del Sacramento runs from about 9°C in July to 25°C in February, with March the wettest month at 287 mm.
warmest month
February
25°C
coolest month
July
9°C
wettest month
March
287 mm
worst air month
July
7 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 24°C | 60 mm | 402 h | 6 |
| February | 25°C | 132 mm | 314 h | 5 |
| March | 22°C | 287 mm | 305 h | 5 |
| April | 18°C | 213 mm | 210 h | 5 |
| May | 13°C | 30 mm | 211 h | 6 |
| June | 14°C | 75 mm | 225 h | 6 |
| July | 9°C | 16 mm | 270 h | 7 |
| August | 12°C | 111 mm | 193 h | 5 |
| September | 16°C | 28 mm | 298 h | 6 |
| October | 19°C | 77 mm | 316 h | 4 |
| November | 21°C | 142 mm | 343 h | 6 |
| December | 21°C | 41 mm | 384 h | 6 |
About 3,471 hours of sun a year. Roughly 122 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 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.