As Sulayyil weather in December

In December, As Sulayyil sees average daytime highs of 25°C and overnight lows near 12°C, with 0 mm of rain across 0.2 wet days and about 10.8 hours of daylight. It is the 11th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 24°C by the end. The sky is clear or mostly clear about 85% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 48 min at the start of December to 10 h 48 min by month's end. Set against the rest of the year, December is As Sulayyil's 5th-clearest and 6th-windiest month. For the whole year in context, see As Sulayyil's year-round climate.

Daytime high
25°
11th warmest
Overnight low
12°
2nd coldest
Rainfall
0 mm
0.2 wet days
Daylight
10 h 48 min
6:31 AM – 5:17 PM
Cloud cover
15%
5th clearest
Wind
12 km/h
6th windiest
Solar energy
4.96 kWh/m²
Travel score
9.4
out of 10

As Sulayyil is human settlement in Saudi Arabia.

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 24°C by the end.

A typical December day in As Sulayyil reaches about 25°C in the afternoon and slips back to 12°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 29°C. Set against its neighbours, December runs about 4°C cooler than November and about 1°C warmer than January.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12714
22714
32614
42614
52613
62613
72613
82613
92613
102613
112513
122513
132513
142512
152512
162512
172512
182512
192512
202412
212412
222412
232411
242411
252411
262411
272411
282411
292411
302411
312411

How December really feels in As Sulayyil

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

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

As Sulayyil weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 11°30.810.99.3
Feb27° / 14°10.411.38.7
Mar31° / 18°51.111.95.7
Apr36° / 23°61.212.52.7
May40° / 26°20.3130.3
Jun43° / 28°0013.20.0
Jul43° / 30°0013.10.0
Aug43° / 29°0012.70.0
Sep40° / 26°0012.10.3
Oct35° / 21°10.111.53.5
Nov29° / 16°10.2117.4
Dec25° / 12°00.210.89.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 85% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 7% of December, with mostly cloudy or overcast conditions the remaining 8%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1937
2937
3937
4937
5937
6937
7928
8928
9928
10928
11919
12919
13919
14919
15919
16919
17919
18928
19928
20928
21928
22937
23937
24937
25937
26937
27937
28937
29928
30928
31928

Chance of precipitation in December

Any precipitation

As Sulayyil gets around 0 mm of rain over 0.2 wet days in December. 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 1% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
11
21
31
41
51
61
71
81
91
101
111
120
130
140
150
160
170
180
190
200
210
220
230
240
250
261
271
281
291
301
311

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19460
29550
39550
49550
59541
69541
79541
89631
99631
109631
119631
129631
139631
149631
159631
169631
179721
189721
199820
209820
219820
229910
239910
249910
259910
269910
279910
2810000
2910000
3010000
3110000

Wind in December

Winds average 12 km/h in December.

Across December, 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
613light breeze
713light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 48 min at the start of December to 10 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 6:22 AM to 6:38 AM, and sunset from 5:13 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.86:225:13
210.86:235:13
310.86:235:13
410.86:245:13
510.86:245:14
610.86:255:14
710.86:265:14
810.86:265:14
910.86:275:15
1010.86:275:15
1110.86:285:15
1210.86:295:15
1310.86:295:16
1410.86:305:16
1510.86:305:16
1610.86:315:17
1710.86:315:17
1810.86:325:18
1910.86:325:18
2010.86:335:19
2110.86:335:19
2210.86:345:19
2310.86:345:20
2410.86:355:20
2510.86:355:21
2610.86:365:21
2710.86:365:22
2810.86:365:22
2910.86:375:23
3010.86:375:24
3110.86:385:24

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.96 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.96 kWh/m² to a high of 7.66 kWh/m² in May across the year — December's 4.96 kWh/m² sits near the bottom.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.9Bright
314.9Bright
Planning a trip in December

Hazard calendar for As Sulayyil

In seasonPeak

None of As Sulayyil's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

As Sulayyil sees seasonal dust haze (January–September), heaviest in July.

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

Is December a good time to visit As Sulayyil?

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

9.4
Sightseeing
1st-best month of the year
8.3
Beach & pool
4th-best month of the year

December is one of the better times to visit As Sulayyil for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for As Sulayyil in December

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

In December, As Sulayyil sees daytime highs around 25°C and nights near 12°C. Worth packing: light clothes and sun protection.

light clothessun protection

UV index in As Sulayyil in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in As Sulayyil peaks around April 14 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeExtremeVery highHighApr 14UV 12Dec 15UV 5
UV index (midday)Level
Jan8Very high
Feb9Very high
Mar11Extreme
Apr12Extreme
May10Very high
Jun12Extreme
Jul10Extreme
Aug11Extreme
Sep7Very high
Oct10Very high
Nov7High
Dec5Moderate

Air quality in As Sulayyil in December

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in As Sulayyil is worst in March — around 110 µg/m³ PM2.5 (unhealthy), about 2.7× the cleanest month (October, 41 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyMar 19108 µg/m³Oct 1342 µg/m³
PM2.5 (µg/m³)Level
Jan77Unhealthy
Feb94Unhealthy
Mar110Unhealthy
Apr101Unhealthy
May82Unhealthy
Jun64Unhealthy
Jul77Unhealthy
Aug69Unhealthy
Sep47Poor
Oct41Poor
Nov57Unhealthy
Dec65Unhealthy
Location & terrain

Where is As Sulayyil?

As Sulayyil sits at 20.5°N, 45.6°E, 606 m above sea level, in Saudi Arabia. The nearest listed city is Laylá, 236 km away.

LayláRanyahQal‘at BīshahAl Mash‘ilīyahḤawṭah Banī TamīmNajranSarāt ‘AbīdahKhamis Mushait

Topography around As Sulayyil

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

Within 3 km, the terrain around As Sulayyil has only modest variations in elevation — a maximum elevation change of 40 m around an average of 606 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 123 m; within 80 km, significant variations in elevation — a maximum elevation change of 428 m.

The land around As Sulayyil is covered by bare terrain (67%) and artificial surfaces (25%) within 3 km, bare terrain (94%) within 16 km, and bare terrain (97%) within 80 km.

3 km
40 m
16 km
123 m
80 km
428 m
treescroplandartificial surfacesbare terrain
December weather nearby: Laylá 236 km · Ranyah 297 km · Qal‘at Bīshah 314 km · Al Mash‘ilīyah 323 km · Ḥawṭah Banī Tamīm 363 km · Najran 363 km · Sarāt ‘Abīdah 368 km · Khamis Mushait 383 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 As Sulayyil (20.4607°, 45.5779°, elevation 606 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).