Nosy Be weather by month
Nosy Be runs from about 25°C in August to 28°C in April, with January the wettest month at 877 mm.
warmest month
April
28°C
coolest month
August
25°C
wettest month
January
877 mm
worst air month
November
6 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 26°C | 877 mm | 229 h | 6 |
| February | 27°C | 395 mm | 296 h | 4 |
| March | 27°C | 401 mm | 294 h | 4 |
| April | 28°C | 89 mm | 325 h | 3 |
| May | 27°C | 26 mm | 321 h | 3 |
| June | 26°C | 18 mm | 327 h | 4 |
| July | 25°C | 9 mm | 345 h | 3 |
| August | 25°C | 21 mm | 352 h | 4 |
| September | 25°C | 42 mm | 340 h | 5 |
| October | 27°C | 45 mm | 365 h | 5 |
| November | 27°C | 174 mm | 360 h | 6 |
| December | 26°C | 249 mm | 345 h | 5 |
About 3,899 hours of sun a year. Roughly 158 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.