Antsiranana weather by month
Antsiranana runs from about 24°C in August to 27°C in November, with January the wettest month at 571 mm.
warmest month
November
27°C
coolest month
August
24°C
wettest month
January
571 mm
worst air month
January
6 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 26°C | 571 mm | 249 h | 6 |
| February | 27°C | 257 mm | 312 h | 5 |
| March | 27°C | 533 mm | 281 h | 3 |
| April | 27°C | 59 mm | 311 h | 3 |
| May | 26°C | 21 mm | 307 h | 4 |
| June | 26°C | 2 mm | 312 h | 5 |
| July | 25°C | 2 mm | 337 h | 3 |
| August | 24°C | 3 mm | 353 h | 4 |
| September | 25°C | 9 mm | 330 h | 4 |
| October | 26°C | 9 mm | 373 h | 5 |
| November | 27°C | 46 mm | 367 h | 5 |
| December | 27°C | 192 mm | 346 h | 4 |
About 3,878 hours of sun a year. Roughly 120 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 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.