Santiago weather by month
Santiago runs from about 10°C in May to 23°C in February, with June the wettest month at 187 mm.
warmest month
February
23°C
coolest month
May
10°C
wettest month
June
187 mm
worst air month
June
94 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 23°C | 0 mm | 426 h | 20 |
| February | 23°C | 8 mm | 358 h | 19 |
| March | 21°C | 4 mm | 358 h | 24 |
| April | 16°C | 9 mm | 268 h | 39 |
| May | 10°C | 117 mm | 214 h | 65 |
| June | 11°C | 187 mm | 122 h | 94 |
| July | 11°C | 0 mm | 257 h | 87 |
| August | 10°C | 88 mm | 234 h | 56 |
| September | 13°C | 6 mm | 279 h | 43 |
| October | 16°C | 26 mm | 326 h | 28 |
| November | 19°C | 1 mm | 375 h | 19 |
| December | 21°C | 0 mm | 425 h | 18 |
About 3,642 hours of sun a year. Roughly 46 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.