Mahajanga weather by month
Mahajanga runs from about 26°C in July to 29°C in April, with January the wettest month at 541 mm.
warmest month
April
29°C
coolest month
July
26°C
wettest month
January
541 mm
worst air month
September
5 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 27°C | 541 mm | 261 h | 4 |
| February | 27°C | 294 mm | 301 h | 3 |
| March | 28°C | 198 mm | 348 h | 2 |
| April | 29°C | 62 mm | 338 h | 3 |
| May | 28°C | 5 mm | 326 h | 4 |
| June | 27°C | 0 mm | 323 h | 4 |
| July | 26°C | 0 mm | 343 h | 3 |
| August | 26°C | 0 mm | 353 h | 4 |
| September | 27°C | 4 mm | 352 h | 5 |
| October | 28°C | 4 mm | 373 h | 5 |
| November | 29°C | 101 mm | 368 h | 5 |
| December | 28°C | 192 mm | 375 h | 4 |
About 4,061 hours of sun a year. Roughly 115 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.