Ilha Grande weather by month
Ilha Grande runs from about 16°C in July to 22°C in February, with January the wettest month at 278 mm.
warmest month
February
22°C
coolest month
July
16°C
wettest month
January
278 mm
worst air month
December
18 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 21°C | 278 mm | 321 h | 15 |
| February | 22°C | 185 mm | 306 h | 11 |
| March | 21°C | 204 mm | 293 h | 13 |
| April | 20°C | 25 mm | 323 h | 14 |
| May | 20°C | 53 mm | 283 h | 12 |
| June | 18°C | 64 mm | 281 h | 12 |
| July | 16°C | 55 mm | 267 h | 16 |
| August | 16°C | 56 mm | 303 h | 14 |
| September | 18°C | 35 mm | 324 h | 14 |
| October | 19°C | 118 mm | 304 h | 15 |
| November | 19°C | 118 mm | 284 h | 14 |
| December | 20°C | 177 mm | 304 h | 18 |
About 3,593 hours of sun a year. Roughly 139 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 2026-05-27. Full method, licences and the list of sources we rejected are on the methodology page.