Rosso weather in May

In May, Rosso sees average daytime highs of 39°C and overnight lows near 23°C, with 0 mm of rain across 0.1 wet days and about 12.8 hours of daylight. It is the 1st-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 39°C through the month. The sky is clear or mostly clear about 77% of the time in May, and the air most often feels comfortable.

Daylight stretches from about 12 h 36 min at the start of May to 12 h 54 min by month's end. Set against the rest of the year, May is Rosso's 1st-clearest and 2nd-windiest month. For the whole year in context, see Rosso's year-round climate.

Daytime high
39°
1st warmest
Overnight low
23°
7th coldest
Rainfall
0 mm
0.1 wet days
Daylight
12 h 48 min
6:36 AM – 7:23 PM
Cloud cover
22%
1st clearest
Wind
19 km/h
2nd windiest
Solar energy
7.46 kWh/m²
Travel score
1.0
out of 10

Rosso is commune of Mauritania.

Density
22/km²
people per km²

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 39°C through the month.

A typical May day in Rosso reaches about 39°C in the afternoon and slips back to 23°C overnight — a 16°C spread between the day's warmth and the night's chill. On most days the high lands between 34°C and 43°C. Set against its neighbours, May runs about 1°C warmer than April and on par with June.

20°30°40°151015202531
Avg high (°C)Avg low (°C)
13822
23822
33822
43822
53822
63822
73822
83822
93822
103822
113923
123923
133923
143923
153923
163923
173923
183923
193923
203923
213923
223923
233923
243923
253923
263923
273923
283923
293923
303923
313924

How May really feels in Rosso

Once humidity and wind are folded in, May averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Rosso weather by month

How May compares with the rest of the year at a glance. May is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 18°40.311.15.5
Feb33° / 19°20.311.44.5
Mar35° / 21°00.111.93.0
Apr37° / 21°0012.41.9
May39° / 23°00.112.81.0
Jun38° / 24°20.3131.4
Jul36° / 25°122.312.92.7
Aug35° / 26°597.512.62.8
Sep36° / 26°558.312.12.3
Oct38° / 25°162.911.61.4
Nov36° / 23°10.211.22.6
Dec33° / 20°20.3114.6

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 77% of the time in May, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of May, with mostly cloudy or overcast conditions the remaining 13%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18812
28911
38911
48911
58911
69010
79010
89010
99010
109010
119010
129010
138911
148812
158812
168713
178614
188614
198614
208515
218515
228416
238416
248317
258317
268416
278416
288416
298416
308515
318515

Chance of precipitation in May

Any precipitation

Rosso gets around 0 mm of rain over 0.1 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 0% and peaks near 1% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
191
201
211
221
230
240
250
260
271
281
291
301
311

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the comfortable band about 36% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
147391410
246391410
345391510
443391620
542391720
641391820
740391830
839381930
938382040
1037372140
1136372250
1235362350
1334362460
1432362560
1531362660
1630362770
1729362870
1828362870
1927372970
2027372980
2126363080
2225363080
2325363180
2424363290
2523353390
26223434100
27213335110
28203236120
29203137130
30192938141
31182838161

Wind in May

Winds average 19 km/h in May.

Across May, daily wind ranges from about 18 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze
3118light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 36 min at the start of May to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over May. Sunrise moves from 6:43 AM to 6:34 AM, and sunset from 7:18 PM to 7:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:437:18
212.66:427:18
312.66:427:19
412.66:417:19
512.66:417:19
612.76:407:19
712.76:407:20
812.76:397:20
912.76:397:20
1012.76:397:21
1112.76:387:21
1212.76:387:21
1312.76:377:22
1412.76:377:22
1512.86:377:22
1612.86:367:23
1712.86:367:23
1812.86:367:23
1912.86:367:24
2012.86:357:24
2112.86:357:24
2212.86:357:25
2312.86:357:25
2412.86:347:25
2512.96:347:26
2612.96:347:26
2712.96:347:26
2812.96:347:27
2912.96:347:27
3012.96:347:27
3112.96:347:28

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 7.46 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.99 kWh/m² to a high of 7.46 kWh/m² in May across the year — May's 7.46 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.5Intense
37.5Intense
47.5Intense
57.5Intense
67.5Intense
77.5Intense
87.5Intense
97.5Intense
107.5Intense
117.5Intense
127.5Intense
137.5Intense
147.5Intense
157.5Intense
167.5Intense
177.5Intense
187.4Intense
197.4Intense
207.4Intense
217.4Intense
227.4Intense
237.4Intense
247.4Intense
257.4Intense
267.4Intense
277.4Intense
287.4Intense
297.3Intense
307.3Intense
317.3Intense
Planning a trip in May

Hazard calendar for Rosso

In seasonPeak

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

Rosso sees dust haze year-round, heaviest in June.

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

Is May a good time to visit Rosso?

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

1.0
Sightseeing
12th-best month of the year
4.4
Beach & pool
12th-best month of the year

May is a weaker month for outdoor sightseeing in Rosso.

What to pack for Rosso in May

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

In May, Rosso sees daytime highs around 39°C and nights near 23°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Rosso in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rosso peaks around March 18 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highExtremeVery highMar 18UV 12Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar13Extreme
Apr11Extreme
May12Extreme
Jun10Very high
Jul10Very high
Aug11Extreme
Sep11Extreme
Oct9Very high
Nov8Very high
Dec7High

Air quality in Rosso in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Rosso is worst in January — around 115 µg/m³ PM2.5 (unhealthy), about 3.7× the cleanest month (August, 31 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorPoorUnhealthyJan 24115 µg/m³Aug 1932 µg/m³
PM2.5 (µg/m³)Level
Jan115Unhealthy
Feb115Unhealthy
Mar85Unhealthy
Apr73Unhealthy
May73Unhealthy
Jun83Unhealthy
Jul46Poor
Aug31Moderate
Sep38Poor
Oct59Unhealthy
Nov62Unhealthy
Dec105Unhealthy
Location & terrain

Where is Rosso?

Rosso sits at 16.5°N, 15.8°W, 8 m above sea level, in Mauritania. The nearest listed city is Richard-Toll, 12 km away.

PodorSaint-LouisLougaNdioumDara

Topography around Rosso

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

Within 3 km, the terrain around Rosso has only modest variations in elevation — a maximum elevation change of 6 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 35 m; within 80 km, only modest variations in elevation — a maximum elevation change of 68 m.

The land around Rosso is covered by grassland (30%) and cropland (29%) within 3 km, cropland (38%) and grassland (30%) within 16 km, and grassland (70%) within 80 km.

3 km
6 m
16 km
35 m
80 km
68 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
May weather nearby: Richard-Toll 12 km · Dagana 22 km · Tékane 50 km · Podor 91 km · Saint-Louis 92 km · Louga 109 km · Ndioum 123 km · Dara 134 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 Rosso (16.5138°, -15.805°, elevation 8 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).