Atar weather in September

In September, Atar sees average daytime highs of 39°C and overnight lows near 28°C, with 15 mm of rain across 3.8 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 39°C in the first days to 38°C by the end. The sky is clear or mostly clear about 70% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Atar's 9th-clearest and 10th-windiest month. For the whole year in context, see Atar's year-round climate.

Daytime high
39°
4th warmest
Overnight low
28°
10th coldest
Rainfall
15 mm
3.8 wet days
Daylight
12 h 06 min
6:43 AM – 6:50 PM
Cloud cover
32%
9th clearest
Wind
14 km/h
10th windiest
Solar energy
6.62 kWh/m²
Travel score
0.9
out of 10

Atar is city in Mauritania.

Density
155/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 39°C in the first days to 38°C by the end.

A typical September day in Atar reaches about 39°C in the afternoon and slips back to 28°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 35°C and 41°C. Set against its neighbours, September runs about 1°C cooler than August and about 3°C warmer than October.

20°25°30°35°40°45°151015202530
Avg high (°C)Avg low (°C)
13928
23928
33928
43928
53928
63928
73928
83928
93928
103928
113928
123928
133928
143928
153928
163928
173928
183828
193827
203827
213827
223827
233827
243827
253827
263827
273827
283827
293827
303826

How September really feels in Atar

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
30
10 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Atar weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 14°30.410.98.8
Feb28° / 16°20.411.37.9
Mar31° / 18°20.411.95.8
Apr35° / 21°10.212.53.7
May38° / 25°10.1131.7
Jun40° / 27°10.613.20.2
Jul40° / 28°31.113.10.0
Aug40° / 28°14412.70.3
Sep39° / 28°153.812.10.9
Oct36° / 24°81.111.52.7
Nov31° / 19°30.6115.8
Dec27° / 15°50.610.88.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 70% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 16%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18812
28812
38812
48812
58713
68614
78614
88614
98614
108614
118614
128614
138614
148614
158515
168416
178416
188416
198317
208317
218317
228218
238218
248119
258119
268119
278020
288020
298020
308020

Chance of precipitation in September

Any precipitation

Atar gets around 15 mm of rain over 3.8 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 12% and peaks near 17% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
117
217
317
416
516
616
715
815
915
1014
1114
1213
1313
1412
1512
1612
1711
1811
1911
2011
2111
2210
2310
2410
2510
269
279
289
298
308

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 61% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1431919135
2441919135
3461918125
4471918125
5491917114
6511816114
7521816104
8531815104
955181593
1056181493
1158171393
1260171283
1360171283
1461171183
1562171173
1663171073
1764161073
1864161073
196516973
206715963
216715963
226814963
236914863
247013863
257013863
267212853
277312753
287411753
297411753
307710643

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 6:40 AM to 6:46 AM, and sunset from 7:04 PM to 6:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:407:04
212.46:407:03
312.46:407:02
412.46:407:01
512.36:417:01
612.36:417:00
712.36:416:59
812.36:416:58
912.36:416:57
1012.26:426:56
1112.26:426:55
1212.26:426:54
1312.26:426:53
1412.26:436:52
1512.16:436:51
1612.16:436:50
1712.16:436:49
1812.16:436:48
1912.16:446:47
2012.06:446:46
2112.06:446:45
2212.06:446:44
2312.06:456:43
2412.06:456:42
2511.96:456:41
2611.96:456:40
2711.96:466:39
2811.96:466:38
2911.96:466:37
3011.86:466:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.62 kWh/m².

For context, solar energy here swings from a low near 4.71 kWh/m² to a high of 7.66 kWh/m² in May across the year — September's 6.62 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.9Intense
26.8Intense
36.8Intense
46.8Intense
56.8Intense
66.8Intense
76.8Intense
86.8Intense
96.7Intense
106.7Intense
116.7Intense
126.7Intense
136.7Intense
146.7Intense
156.6Intense
166.6Intense
176.6Intense
186.6Intense
196.6Intense
206.5Intense
216.5Intense
226.5Intense
236.5Intense
246.5Intense
256.5Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.4Intense
Planning a trip in September

Hazard calendar for Atar

In seasonPeak

In September, Atar sits inside its dust season. The full year is below, with each hazard's peak months called out.

Atar sees dust haze year-round, heaviest in July.

Dust
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Atar?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.9
Sightseeing
9th-best month of the year
4.0
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Atar.

What to pack for Atar in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Atar sees daytime highs around 39°C and nights near 28°C. Pack light clothes and sun protection. About 4 days see rain.

light clothessun protection

UV index in Atar in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Atar peaks around March 17 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 6 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highExtremeVery highHighMar 17UV 11Dec 16UV 6
UV index (midday)Level
Jan7Very high
Feb10Extreme
Mar11Extreme
Apr10Extreme
May11Extreme
Jun11Extreme
Jul9Very high
Aug10Extreme
Sep10Extreme
Oct9Very high
Nov7Very high
Dec6High

Air quality in Atar in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Atar is worst in January — around 117 µg/m³ PM2.5 (unhealthy), about 1.9× the cleanest month (April, 60 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyJan 12116 µg/m³Apr 2260 µg/m³
PM2.5 (µg/m³)Level
Jan117Unhealthy
Feb102Unhealthy
Mar80Unhealthy
Apr60Unhealthy
May62Unhealthy
Jun89Unhealthy
Jul114Unhealthy
Aug94Unhealthy
Sep77Unhealthy
Oct69Unhealthy
Nov64Unhealthy
Dec112Unhealthy
Location & terrain

Where is Atar?

Atar sits at 20.5°N, 13.0°W, 192 m above sea level, in Mauritania. The nearest listed city is Akjoujt, 164 km away.

AkjoujtZouératMagṭa‘ LaḥjarBoutilimittAlegGuerouDar NaimKsar

Topography around Atar

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Atar.

Within 3 km, the terrain around Atar has only modest variations in elevation — a maximum elevation change of 26 m around an average of 229 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 603 m; within 80 km, large variations in elevation — a maximum elevation change of 691 m.

The land around Atar is covered by bare terrain (96%) within 3 km, bare terrain (100%) within 16 km, and bare terrain (100%) within 80 km.

3 km
26 m
16 km
603 m
80 km
691 m
treesshrubsartificial surfacesbare terrain
September weather nearby: Akjoujt 164 km · Zouérat 254 km · Magṭa‘ Laḥjar 335 km · Boutilimitt 373 km · Aleg 396 km · Guerou 397 km · Dar Naim 404 km · Ksar 407 km

Mauritania travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type C / E / F
220 V · 50 Hz
Prices
≈ 31% of US
price level, 2025
GDP per capita
$2,198
2025
Happiness
4.5 / 10
World Happiness, 2025
Homicide rate
1
per 100k, 2020
Road deaths
25.6
per 100k/yr, 2019
Income group
Lower middle
World Bank
Religion
Muslim 100%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Atar (20.5188°, -13.0464°, elevation 192 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).