In Niger, the climate is desert in the north, semi-desert in the center, and semi-arid of the savanna in the south. In fact, the rains increase from north to south because of the African monsoon, which brings humidity and clouds from the Atlantic Ocean, in the June-September period.

Index


The center-north



The north, part of the Sahara desert, is mild in winter (but with strong temperature variations, so it can get cold at night, while it can get hot during the day, especially in February) and very hot in the rest of the year, and it is almost always sunny.

Bilma

Here are the average temperatures of Bilma, located in the north-east, at 350 meters (1,150 feet) above sea level.
Bilma - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)9111420242526272420128
Max (°C)283235414344434242393329
Min (°F)485257687577798175685446
Max (°F)8290951061091111091081081029184

The rains in the north are rare and sporadic, however, there may be some rare showers in summer. Here is the average precipitation in Bilma.
Bilma - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)100111310520024
Prec.(in)0000000.10.40.20.1000.9
Days0000011110004

In Bilma, the sun shines all year round, although in summer, some cloud banks can sometimes reach the area. Here are the average sunshine hours per day.
Bilma - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours101010101111101010101010

In winter, in the Djado Plateau and in the Aïr Massif, but sometimes also in the Ténéré Desert, nights can be cold, and the temperature can sometimes drop to around freezing (0 °C or 32 °F), while daytime temperatures are around 20/25 °C (68/77 °F). In winter, a dry wind called Harmattan blows, raising dust and sand, which can veil the sun, especially from January onwards. On the top of the Aïr, on Mont Idoukal-n-Taghès, 2,022 meters (6,634 feet) high, night frosts are frequent. In the rest of the year, in the north, scorching heat reigns supreme, at least in the lowlands, with highs around 40 °C (104 °F) from April to September, and peaks of as high as 50 °C (122 °F).

Ténéré Desert

The central-southern region, known as Sahel, receives rainfall during the summer months. The northernmost part, at the boundary with the previous region, is still desert, and receives little rainfall: in the Aïr Massif and in Agadez, the annual amount is slightly above 100 millimeters (4 inches), with a maximum in August, when 50 mm (2 in) of rain fall in Agadez.

Agadez

Here is the average precipitation in Agadez.
Agadez - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)000261035508000111
Prec.(in)0000.10.20.41.420.30004.4
Days00011245200015

In Agadez, the winter nights are not as cold as in Bilma, while summer is less hot.
Agadez - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)141720252828262526241814
Max (°C)293336404242403840393430
Min (°F)576368778282797779756457
Max (°F)8491971041081081041001041029386

The sun in Agadez shines all year round, but in summer, some cloud banks can sometimes reach this area.
Agadez - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours101010101099910101010

The south



Rainfall in Niger, in inches (left) and millimeters (right)

The map above depicts the lines of equal rainfall (called isohyets) of 100 mm and 600 mm (4 and 23.5 in) per year in the country.
As you can see, rainfall is moderate only in the southernmost part.
In Tahoua, in the south-west, rainfall amounts to 365 mm (14 in) per year, while in the area of Lake Chad, in the south-east, it amounts to about 250/300 mm (10/12 in) per year.

Niamey

In the capital, Niamey, 585 mm (23 in) of rain fall per year, with the first sporadic showers in the afternoon or evening as early as in May, which increase progressively until August, when rainfall reaches 205 mm (8 in), and then they decrease by September and cease in early October. Here is the average precipitation.
Niamey - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)01173585140205902010585
Prec.(in)0000.31.43.35.58.13.50.80023
Days001146913720043

In Niamey and in the rest of the south, the temperature also follows a different pattern compared with the north. Winter is hotter, with highs exceeding 30 °C (86 °F) even in January; sometimes, it can get quite cold at night, but with lows of 7/8 °C (45/46 °F), so not around the freezing point as happens in the north. In spring, the temperature rises quickly, in fact, the daytime average reaches 40 °C (104 °F) in March, and it can exceed 45 °C (113 °F) in May, then the monsoon lowers the temperature in summer, but at the cost of an increase in humidity: in August, highs return to 33 °C (91 °F), as in January, although night temperatures are higher and the humidity makes the heat muggy. After the monsoon, hot weather returns, with highs around 37/38 °C (98/100 °F) in October and November, before winter, which brings a bit of cool weather, at least at night.
Here are the average temperatures in Niamey.
Niamey - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)172024282927252424252118
Max (°C)323740424138353335383734
Min (°F)636875828481777575777064
Max (°F)90991041081061009591951009993

In winter, the sky is clear, though the sun may be veiled because of the Harmattan, which raises a fine dust that penetrates everywhere and makes the sky whitish. South-central Niger is one of the hardest-hit areas by the Harmattan across the Sahel. In summer, the sunshine hours decrease a little because of the monsoon, and August is the least sunny month.
Niamey - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours9998888789109

To the east of the capital, cities such as Maradi and Zinder have a climate similar to that of Niamey.

Mosque in Niamey

In the far south, rainfall is more abundant, so much so that it exceeds 600 mm (23.5 in) per year; therefore, we are out of the Sahel proper. In Gaya, 825 mm (32.5 in) of rain fall per year, of which 70 mm (2.8 in) fall already in May, and with maximum of and 250 mm (10 in) in August. Here, the landscape becomes definitely green in the summer months. The hottest month in the far south is April, in fact, the temperature begins to decrease as early as in May, while in summer, the heat is tropical, that is, uncomfortable because of high humidity.

Best Time



The best time to travel to Niger is winter, from December to mid-February, when the sun shines in the whole country, the air is dry and the temperature is usually acceptable. In the south, it can get definitely hot during the day even at this time, but nights remain cool. In the north, it can get cold at night, while generally, the temperature is pleasantly warm during the day. In January, sand storms become more frequent, and in February, the heat begins to increase in the south, heading towards 40 °C (104 °F), so, all in all, the best month is December.

What to pack



In winter: bring light clothes for the day, long and made of natural fabric (cotton or linen), a desert turban for the wind-borne sand and dust, sunglasses (even graduated instead of contact lenses), a jacket and a sweater for the evening, desert boots or sandals, and a sweatshirt or sweater for boat excursions on the Niger River.

In summer: in the desert, bring loose-fitting, light-colored clothing, long and made of natural fabric (cotton or linen), a desert turban, sunglasses, and comfortable and breathable shoes. A sweatshirt for the night and a sleeping bag to sleep outdoors. In Niamey and the south, light clothes, an umbrella or a light raincoat for the rain showers.
It's better for women to avoid shorts and miniskirts.

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