Weather in Antananarivo

Antananarivo is in Madagascar at 18.9°S. The 2001–2020 NASA POWER daily record describes a mild oceanic climate. Rain is wet season runs from October to April, inside an annual total of 2383 mm. The wettest month is January at 475 mm; the driest is September at 46 mm.

December is the warmest month (average 19.8°C, high 24.3°C) and July is the coolest (average 13.2°C, low 9.0°C). From the coolest night in July (9.0°C) to the hottest afternoon in December (24.4°C), the raw range is 15.4°C. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are November, December, and January.

Rain through the year

The wet season in Antananarivo starts in October and ends in April (October, November, December, January, February, March, and April). January is the core of it at 475 mm. September is the other extreme, with 46 mm.

A rainy day here is a day with at least 1 mm in the NASA POWER series. January averages 30 such days; September averages 13.

Hot and cool months in Antananarivo

Antananarivo has a 6.6°C gap between its coolest monthly average (13.2°C in July) and its warmest (19.8°C in December). That is a southern-hemisphere pattern.

Mean high across all twelve months is 21.7°C and mean low is 12.6°C. These are 20-year grid averages, so a city station can read a few degrees warmer or cooler.

The calendar in Antananarivo

January is the wettest month — 475 mm and 30 rainy days, with 87% humidity. February: 23.5°C high, 15.6°C low, 379 mm rain, 88% humidity. In March, Antananarivo averages 23.0°C by day and 15.2°C at night, with 305 mm of rain. By April the wet season is ending. Antananarivo still sees about 159 mm, but the next month is usually leaner. May stands apart from the months beside it: 20.4°C / 11.8°C and 85 mm.

July is the coolest month, with lows around 9.0°C and highs near 17.4°C. Rainfall is 85 mm. September is the driest month, averaging only 46 mm across 13 rainy days. Highs sit near 21.0°C. November brings 222 mm and 23 rainy days; temperatures run from 14.1°C to 24.4°C. December is the warmest month. Afternoon highs average 24.3°C and nights settle near 15.4°C, with 388 mm of rain.

Best months to visit Antananarivo

The three months with the highest comfort score are November, December, and January: November (19.3°C average, 222 mm, 80% humidity); December (19.8°C average, 388 mm, 84% humidity); January (19.6°C average, 475 mm, 87% humidity). Those months sit across the year end, so they are listed in season order rather than January-to-December. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at October–April instead of the score.

How Antananarivo compares inside Madagascar

Antananarivo is the only Madagascar city in this dataset, so the figures on this page are the national sample we publish. They still come from the same NASA POWER daily series (2001–2020) used everywhere else on the site.