As Sulayyil weather in September

In September, As Sulayyil sees average daytime highs of 40°C and overnight lows near 26°C, with 0 mm of rain across 0 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 42°C in the first days to 38°C by the end. The sky is clear or mostly clear about 90% 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 As Sulayyil's 2nd-clearest and 12th-windiest month. For the whole year in context, see As Sulayyil's year-round climate.

Daytime high
40°
4th warmest
Overnight low
26°
8th coldest
Rainfall
0 mm
0 wet days
Daylight
12 h 06 min
5:49 AM – 5:55 PM
Cloud cover
12%
2nd clearest
Wind
10 km/h
12th windiest
Solar energy
6.7 kWh/m²
Travel score
0.3
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 September

Average highAverage lowShaded bands: 10–90% of days

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

A typical September day in As Sulayyil reaches about 40°C in the afternoon and slips back to 26°C overnight — a 15°C spread between the day's warmth and the night's chill. On most days the high lands between 38°C and 42°C. Set against its neighbours, September runs about 3°C cooler than August and about 5°C warmer than October.

20°25°30°35°40°45°151015202530
Avg high (°C)Avg low (°C)
14228
24228
34228
44228
54227
64227
74227
84127
94127
104127
114127
124126
134126
144126
154026
164026
174026
184025
194025
204025
214025
223925
233924
243924
253924
263924
273824
283824
293823
303823

How September really feels in As Sulayyil

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
24 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.

As Sulayyil weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-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 September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 90% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 4%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1937
2937
3937
4937
5946
6946
7946
8946
9955
10955
11964
12964
13964
14973
15973
16973
17973
18982
19982
20982
21982
22982
23982
24991
25991
26991
27991
28991
29991
30991

Chance of precipitation in September

Any precipitation

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

0%10%20%30%151015202530
Rain chance (%)
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300

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 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19910
29910
310000
410000
510000
610000
710000
810000
910000
1010000
1110000
1210000
1310000
1410000
1510000
1610000
1710000
1810000
1910000
2010000
2110000
2210000
239901
249901
259811
269811
279811
289811
299811
309811

Wind in September

Winds average 10 km/h in September, the calmest month.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 5:45 AM to 5:52 AM, and sunset from 6:10 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:456:10
212.45:456:09
312.45:466:08
412.45:466:07
512.35:466:06
612.35:466:05
712.35:476:04
812.35:476:03
912.35:476:02
1012.25:476:01
1112.25:476:00
1212.25:485:59
1312.25:485:58
1412.25:485:57
1512.15:485:56
1612.15:495:55
1712.15:495:54
1812.15:495:54
1912.15:495:53
2012.05:495:52
2112.05:505:51
2212.05:505:50
2312.05:505:49
2412.05:505:48
2511.95:515:47
2611.95:515:46
2711.95:515:45
2811.95:515:44
2911.95:525:43
3011.85:525:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.7 kWh/m².

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 — September's 6.7 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.9Intense
26.9Intense
36.9Intense
46.9Intense
56.8Intense
66.8Intense
76.8Intense
86.8Intense
96.8Intense
106.8Intense
116.8Intense
126.7Intense
136.7Intense
146.7Intense
156.7Intense
166.7Intense
176.7Intense
186.7Intense
196.6Intense
206.6Intense
216.6Intense
226.6Intense
236.6Intense
246.6Intense
256.6Intense
266.6Intense
276.5Intense
286.5Intense
296.5Intense
306.5Intense
Planning a trip in September

Hazard calendar for As Sulayyil

In seasonPeak

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

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 September a good time to visit As Sulayyil?

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

0.3
Sightseeing
8th-best month of the year
3.1
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in As Sulayyil.

What to pack for As Sulayyil in September

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

In September, As Sulayyil sees daytime highs around 40°C and nights near 26°C. Pack light clothes and sun protection.

light clothessun protection

UV index in As Sulayyil in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — 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 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 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
September 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).