SeasonMapNosy Be weather in September
Madagascar
September in Nosy Be: hot, a little rain, with clean air — fine if you can take 19 rainy days.
#4 of 12 months in Nosy Be · #275 of 1383 destinations to visit in September · comfort 89/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Nosy Be in September
Other months in Nosy Be
Nosy Be's forum calls June one of the cooler, drier months in Madagascar — regulars say the water is swimmable but comfort varies by how used you are to warmer seas, since it's noticeably less balmy than the peak of summer. It also marks the start of the island's high season, so booking ahead is worth it.
Add your own note from Nosy Be's card on the map.
Nosy Be climate normals — September
| Daytime high | 30°C / 86°F | 🥵 hot |
|---|---|---|
| Nighttime low | 20°C / 67°F | |
| Feels like (high) | 33°C / 91°F | |
| Sea temperature | 28°C / 82°F | 😎 warm sea |
| Rainfall | 61 mm / 2.4 in | 🌦 some rain |
| Rainy days | 19 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 19°C / 66°F | |
| Sunshine | 11 h/day | |
| Daylight | 12 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 25 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Nosy Be in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyThe dry season, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Nosy Be's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherNosy Be's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Nosy Be in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
The dry season
1 May – 15 Nov · usuallyCrowdedThe long dry stretch, and why the island's season runs May to November. Flat mornings, the boats to Nosy Iranja and Tanikely going daily, and effectively no rain.
- Nature
Humpback whales
1 Jul – 30 Sep · usuallyWhale seasonHumpbacks move through the channel on their way to and from Sainte Marie, and the boats out of Ambatoloaka find them most days through the middle of the dry season.
- Nature
Whale sharks
1 Sep – 15 Dec · usuallyDive seasonWhale sharks feed off the north of the island through the last quarter of the year, thickest in October and November. Swimming with them is regulated and the operators mostly keep to the code.
Where is Nosy Be?
Nosy Be in September — FAQ
- Is September a good time to visit Nosy Be?
- September in Nosy Be: hot, a little rain, with clean air — fine if you can take 19 rainy days. It ranks #4 of 12 months for Nosy Be on SeasonMap's comfort score (89/100).
- What is the weather like in Nosy Be in September?
- In September, Nosy Be averages a daily high of 29.8°C and a low of 19.6°C, with about 61.3 mm of rain over roughly 18.6 rainy days.
- What is the air quality in Nosy Be in September?
- Nosy Be has a mean US Air Quality Index of about 25 in September.