Ad Dilam weather in May

In May, Ad Dilam sees average daytime highs of 40°C and overnight lows near 26°C, with 1 mm of rain across 0.3 wet days and about 13.1 hours of daylight. It is the 5th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 38°C in the first days to 42°C by the end. The sky is clear or mostly clear about 82% of the time in May, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of May to 13 h 24 min by month's end. Set against the rest of the year, May is Ad Dilam's 6th-clearest and 7th-windiest month. For the whole year in context, see Ad Dilam's year-round climate.

Daytime high
40°
5th warmest
Overnight low
26°
9th coldest
Rainfall
1 mm
0.3 wet days
Daylight
13 h 12 min
5:13 AM – 6:22 PM
Cloud cover
19%
6th clearest
Wind
12 km/h
7th windiest
Solar energy
7.66 kWh/m²
Travel score
0.4
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 38°C in the first days to 42°C by the end.

A typical May day in Ad Dilam reaches about 40°C in the afternoon and slips back to 26°C overnight — a 14°C spread between the day's warmth and the night's chill. On most days the high lands between 37°C and 43°C. Set against its neighbours, May runs about 6°C warmer than April and about 3°C cooler than June.

20°25°30°35°40°45°151015202531
Avg high (°C)Avg low (°C)
13824
23824
33824
43824
53824
63925
73925
83925
93925
103925
113925
124026
134026
144026
154026
164026
174026
184026
194126
204126
214127
224127
234127
244127
254227
264227
274227
284227
294227
304227
314227

How May really feels in Ad Dilam

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
23 feel dangerously hot (≥ 39°C)
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.

Ad Dilam weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 10°81.710.78.5
Feb24° / 12°71.311.29.1
Mar29° / 16°81.511.87.2
Apr35° / 21°11212.53.5
May40° / 26°10.313.10.4
Jun43° / 28°0013.50.0
Jul44° / 29°0013.30.0
Aug44° / 29°0012.80.0
Sep41° / 25°0012.10.2
Oct35° / 20°10.211.43.2
Nov28° / 15°81.210.87.7
Dec23° / 11°81.510.58.9

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 82% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 8% of May, with mostly cloudy or overcast conditions the remaining 10%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18515
28614
38614
48614
58713
68713
78713
88812
98812
108911
118911
128911
138911
148911
159010
169010
179010
189010
199010
209010
21919
22919
23919
24919
25919
26937
27937
28937
29946
30955
31955

Chance of precipitation in May

Any precipitation

Ad Dilam gets around 1 mm of rain over 0.3 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 1% and peaks near 5% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
15
25
34
44
53
63
73
82
92
102
111
121
131
141
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
194321
294321
393331
494321
595221
695221
795221
895221
995221
1096121
1198110
1298110
1398110
1498110
1598110
1699100
1799100
1899100
19100000
20100000
21100000
22100000
23100000
24100000
25100000
26100000
27100000
28100000
29100000
30100000
31100000

Wind in May

Winds average 12 km/h in May.

Across May, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 54 min at the start of May to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over May. Sunrise moves from 5:22 AM to 5:08 AM, and sunset from 6:15 PM to 6:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:226:15
212.95:216:15
312.95:216:16
412.95:206:16
513.05:196:17
613.05:196:17
713.05:186:18
813.05:176:18
913.05:176:19
1013.15:166:19
1113.15:166:20
1213.15:156:20
1313.15:146:21
1413.15:146:21
1513.15:136:22
1613.25:136:22
1713.25:126:23
1813.25:126:23
1913.25:126:24
2013.25:116:24
2113.25:116:25
2213.25:106:25
2313.35:106:26
2413.35:106:26
2513.35:096:27
2613.35:096:27
2713.35:096:28
2813.35:096:28
2913.35:086:29
3013.35:086:29
3113.45:086:30

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 7.66 kWh/m².

For context, solar energy here swings from a low near 4.33 kWh/m² to a high of 7.69 kWh/m² in June across the year — May's 7.66 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.4Intense
27.4Intense
37.4Intense
47.5Intense
57.5Intense
67.5Intense
77.5Intense
87.5Intense
97.6Intense
107.6Intense
117.6Intense
127.6Intense
137.6Intense
147.7Intense
157.7Intense
167.7Intense
177.7Intense
187.7Intense
197.7Intense
207.7Intense
217.7Intense
227.7Intense
237.7Intense
247.7Intense
257.7Intense
267.7Intense
277.7Intense
287.7Intense
297.7Intense
307.7Intense
317.7Intense
Planning a trip in May

Hazard calendar for Ad Dilam

In seasonPeak

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

Ad Dilam sees seasonal dust haze (February–September), heaviest in May.

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

Is May a good time to visit Ad Dilam?

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

0.4
Sightseeing
8th-best month of the year
3.1
Beach & pool
8th-best month of the year

May is a weaker month for outdoor sightseeing in Ad Dilam.

What to pack for Ad Dilam in May

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

In May, Ad Dilam sees daytime highs around 40°C and nights near 26°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Ad Dilam in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Ad Dilam peaks around July 20 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighModerateJul 20UV 11Dec 17UV 5
UV index (midday)Level
Jan6High
Feb7Very high
Mar9Very high
Apr7Very high
May10Very high
Jun9Very high
Jul11Extreme
Aug10Extreme
Sep9Very high
Oct9Very high
Nov6High
Dec4Moderate

Air quality in Ad Dilam 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 Ad Dilam is worst in March — around 72 µg/m³ PM2.5 (unhealthy), about 1.9× the cleanest month (October, 38 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorMar 2372 µg/m³Oct 1539 µg/m³
PM2.5 (µg/m³)Level
Jan51Poor
Feb57Unhealthy
Mar72Unhealthy
Apr71Unhealthy
May68Unhealthy
Jun60Unhealthy
Jul59Unhealthy
Aug52Poor
Sep42Poor
Oct38Poor
Nov44Poor
Dec47Poor
Location & terrain

Where is Ad Dilam?

Ad Dilam sits at 24.0°N, 47.2°E, 453 m above sea level, in Saudi Arabia. The nearest listed city is Al Kharj, 25 km away.

RumāḩLayláShaqra

Topography around Ad Dilam

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

Within 3 km, the terrain around Ad Dilam has only modest variations in elevation — a maximum elevation change of 45 m around an average of 451 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 145 m; within 80 km, large variations in elevation — a maximum elevation change of 804 m.

The land around Ad Dilam is covered by bare terrain (64%) within 3 km, bare terrain (83%) within 16 km, and bare terrain (96%) within 80 km.

3 km
45 m
16 km
145 m
80 km
804 m
treesshrubscroplandartificial surfacesbare terrain
May weather nearby: Al Kharj 25 km · Ḥawṭah Banī Tamīm 62 km · Riyadh 89 km · ‘Irqah 95 km · Ad Dir‘īyah 106 km · Rumāḩ 175 km · Laylá 194 km · Shaqra 238 km

Saudi Arabia travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type G
230 V · 60 Hz
Prices
≈ 47% of US
price level, 2025
GDP per capita
$34,537
2025
Happiness
6.8 / 10
World Happiness, 2025
Homicide rate
0.9
per 100k, 2019
Road deaths
35.9
per 100k/yr, 2019
Income group
High
World Bank
English
Very low
EF EPI 404

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 Ad Dilam (23.991°, 47.1618°, elevation 453 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).