Best Time to Visit Lake Iriki and Erg Chigaga: Weather by Season

The short answer

For most people, the most comfortable time to visit Lake Iriki and Erg Chigaga is from autumn to spring, roughly October to April. Days are warm or mild and pleasant for walking in the dunes. Nights are cool in autumn and spring and properly cold in winter.

Summer is very hot and calls for a slower trip built around the cool hours. Spring often brings wind, and rain, though rare, can close pistes for a while.

Live weather and climate are not the same thing

This page describes what each season is usually like. It is not a forecast. For today’s weather and any warnings, check the Direction Générale de la Météorologie (DGM), Morocco’s national weather service, at marocmeteo.ma, or a forecast app you trust. The DGM issues the official forecasts and weather alerts for the country. Forecast apps may model a point that does not quite match the dunes, so look at the trend over several days rather than a single figure.

Before every departure, your guide checks the conditions: the forecast, any recent rain and the state of the pistes. If storms or strong wind are expected, we talk to you before you set off, and the route or timing can be adjusted.

A word on the figures. Zagora, in the Drâa valley, is the nearest town with published climate averages. According to those averages (Wikipedia and Climate-Data.org), summer daytime highs are around or above 40 °C, January days are around 20 °C, winter nights are cold, and annual rainfall is very low. Foum Zguid, the open Iriki basin and the Chigaga dunes are different places and can differ from Zagora, sometimes noticeably: bare sand and flats heat up quickly in the sun and lose that heat quickly after dark. Read these numbers as a rough guide, never as a promise.

Season by season

Autumn (September to November)

September often still feels like summer, with hot days and warm nights. It is also the month when late-summer storms are most likely to break, as they did in September 2024. By October the heat eases and walking weather returns. November is, for many, one of the nicest months: clear light, comfortable days and nights that cool down fast.

Winter (December to February)

Winter days are usually mild, sunny and clear, pleasant for walking at any hour, though the sunset comes early. Nights are the coldest of the year, especially in a desert camp. With the right clothing this is a lovely season.

Spring (March to May)

March and April bring warm days and mild nights, and spring is commonly reported as the windiest time of year. Some days are clear and calm; on others, sand and dust hang in the air and soften the horizon. By May the heat is building and the middle of the day in open terrain becomes tiring.

Summer (June to August)

Summer is the hot season. Midday heat in the dunes and on the basin can be dangerous, the sand burns underfoot, and nights stay warm. Travel is still possible for people who handle heat well, with a carefully adapted programme.

Month by month at a glance

Month	Days	Nights	What to expect	Good for
January	Mild, sunny	Cold	Clear skies, short days, among the coldest nights of the year	Dune walks at any hour, stars, if you pack warm
February	Mild, warming	Cold	Much like January, gradually softer	Multi-day trips, walking
March	Warm	Cool	Wind becomes more frequent	Most trips; bring a scarf
April	Warm to hot	Mild	Windy spells and dust haze possible; heat building	Most trips, with a midday break
May	Hot	Mild to warm	Midday in the open becomes tiring	Early starts, shorter outings
June	Very hot	Warm	Strong midday heat	Heat-hardy travellers, adapted timing
July	Very hot, usually among the hottest	Warm	Midday heat can be dangerous	Only with an adapted programme
August	Very hot	Warm	As July; isolated storms possible	Only with an adapted programme
September	Hot	Warm	Heat easing late in the month; storms and flash floods possible	Flexible travellers
October	Warm	Mild to cool	Walking weather returns	Most trips
November	Mild to warm	Cool to cold	Pleasant days, nights cooling fast	Most trips, bivouac nights with layers
December	Mild	Cold	Short days, cold nights, holiday period	Dunes and stars, with warm sleeping layers

Heat, and how trips adapt to it

Heat is the main constraint in this desert. Even in spring and autumn the sun is strong, and there is little natural shade on the basin or in the dunes.

When it is hot, a sensible day follows the sun: set off early, cross the open ground in the cooler hours, rest in the shade at midday and go back onto the dunes in the late afternoon, when the sand cools. Climbing a high dune at midday in summer is not worth the risk.

If summer is your only window, say so when you get in touch. Your guide can suggest a lighter programme, and whether a summer departure suits your group is confirmed in the written quote. Whatever the season, drink often, cover your head and shoulders, and tell your guide straight away if you feel dizzy, sick or unusually tired.

Wind and sand

Wind is part of desert life here. Spring is commonly reported as the windiest season, though a windy day can come at any time of year. In summer a hot, dry wind from the east, often called the chergui in Morocco, can make the heat feel heavier.

On a windy day sand stings the legs, gets into everything and can blur the horizon to a pale haze. It is uncomfortable rather than dangerous for most people, but it changes the day: dune walks are shorter, photos are softer and dinner may move inside the camp. A cotton scarf or chèche over nose and mouth, close-fitting sunglasses and a zip bag for your phone and camera make a real difference.

Strong wind can also shift sand across the pistes. Your guide reads this as part of the drive, and the timing may change.

Rain and flash floods

Annual rainfall in this part of the pre-Saharan south is very low, and most visitors never see a drop. But rare storms can be heavy. In September 2024, heavy rain sent floodwater across the region, and NASA satellite imagery from 10 September 2024 showed water in the Iriqui basin.

When it rains, the desert changes fast. Dry riverbeds (oueds) can carry fast, muddy water, sometimes hours after a distant storm, and the lakebed clay turns to sticky mud. Some pistes can become impassable or be closed for a while, and an itinerary may need to wait or take another line.

If rain is forecast around your dates, your guide will tell you what it means for the route. Keep a little flexibility in your plans; waiting half a day is better than getting stuck. Our map and access guide explains what to expect on the pistes after rain.

Cold desert nights in winter

Visitors often pack for the Sahara as if it were hot around the clock, and winter nights catch them out. Zagora’s averages show mild January days but cold nights, and in the dunes, under clear dry skies, the day’s warmth drains away soon after sunset.

The answer is simple: layers. A warm fleece or down jacket, a hat, gloves, warm socks and something comfortable to sleep in. Ask what bedding the camp provides and whether extra blankets are available. Our Iriki bivouac page explains what a night at camp usually looks like. The reward is the sky: long, dark winter nights are among the best for stars.

What to pack, season by season

All year: sun hat or chèche, sunglasses, high-factor sunscreen and lip balm, a reusable water bottle, a head torch, shoes that cope with sand, a small bag to protect electronics from dust, and cash for tips and extras.

Autumn and spring: light, covering clothes for the day; a fleece or light jacket for evenings; a scarf for windy days, especially in spring.

Winter: everything above, plus a warm jacket, hat, gloves, warm socks and warm sleepwear.

Summer: loose, long, light-coloured clothing rather than shorts and vest tops, which protect less from the sun; a wide-brimmed hat; electrolyte sachets if you use them; and a willingness to rest through the middle of the day.

If you plan to drive yourself to Foum Zguid, our route and map guide has a practical checklist for self-drivers.

The lake changes with the rain

Lake Iriki is an ephemeral lake. For most of recent decades it has been a dry basin: a wide, pale clay flat ringed by dunes and low hills. The September 2024 rains showed that it can still fill, at least for a time.

No season guarantees water. Whether there is any, how much, and for how long depends on rain that may have fallen far upstream, and things can change quickly. If seeing water matters to you, keep your dates flexible and ask for a recent report before you travel. Our Lake Iriki guide tells the longer story of the basin and how it has changed.

Busy periods and holidays

In general, the most comfortable months are also the busiest across Morocco’s desert areas, and school holidays, Easter and the end-of-year period tend to draw more travellers. The western side of Erg Chigaga, reached from Foum Zguid, is remote, so even then it rarely feels crowded, but it is wise to get in touch early if your dates are fixed.

Ramadan moves earlier each year in the Gregorian calendar. Desert trips can usually go ahead, though opening hours in towns may change; your guide will tell you what to expect if your trip falls during it.

Choosing your dates

If you can choose freely, aim for autumn or spring, or winter if you do not mind cold nights. Then pick the trip that fits your time. The two-day trip from Foum Zguid to Erg Chegaga crosses the Iriki basin and spends a night in the dunes; the three-day trip gives a slower pace and more room to adapt to weather. Our Erg Chigaga guide describes the dunes themselves, and the Foum Zguid page the town where our tours begin.

When you are ready, tell us your dates and how flexible you are. We will reply with what to expect for that season and a written quote.