Ar Rass weather in September

In September, Ar Rass sees average daytime highs of 40°C and overnight lows near 25°C, with 0 mm of rain across 0.1 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 9th-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 92% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Ar Rass's 2nd-clearest and 10th-windiest month. For the whole year in context, see Ar Rass's year-round climate.

Daytime high: 40°; 4th warmest
Overnight low: 25°; 9th coldest
Rainfall: 0 mm; 0.1 wet days
Daylight: 12 h 06 min; 5:56 AM – 6:05 PM
Cloud cover: 9%; 2nd clearest
Wind: 13 km/h; 10th windiest
Solar energy: 6.67 kWh/m²
Travel score: 0.3; out of 10

Ar Rass is human settlement in Saudi Arabia.

Density: 1,362/km²; people per km²

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

← August Ar Rass year-round climate October →Best places to visit in September

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

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 Ar Rass reaches about 40°C in the afternoon and slips back to 25°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 2°C cooler than August and about 6°C warmer than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	42	42	42	42	42	42	41	41	41	41	41	41	41	41	41	40	40	40	40	40	40	40	39	39	39	39	39	38	38	38
Avg low (°C)	27	27	27	27	27	26	26	26	26	26	26	26	26	25	25	25	25	25	25	25	25	24	24	24	24	24	24	23	23	23

	Avg high (°C)	Avg low (°C)
1	42	27
2	42	27
3	42	27
4	42	27
5	42	27
6	42	26
7	41	26
8	41	26
9	41	26
10	41	26
11	41	26
12	41	26
13	41	26
14	41	25
15	41	25
16	40	25
17	40	25
18	40	25
19	40	25
20	40	25
21	40	25
22	40	24
23	39	24
24	39	24
25	39	24
26	39	24
27	39	24
28	38	23
29	38	23
30	38	23

How September really feels in Ar Rass

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

25 feel dangerously hot (≥ 39°C)

Days feeling ≤ 0°C

wind chill below the day's low

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

Ar Rass weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	20° / 8°	13	2.4	10.6	8.0
Feb	23° / 11°	6	1.1	11.1	8.9
Mar	27° / 14°	14	2.2	11.8	8.0
Apr	33° / 19°	13	2.7	12.6	4.6
May	38° / 24°	2	0.4	13.2	1.3
Jun	42° / 26°	0	0	13.6	0.0
Jul	42° / 27°	0	0	13.5	0.0
Aug	43° / 28°	0	0	12.9	0.0
Sep	40° / 25°	0	0.1	12.2	0.3
Oct	35° / 21°	3	0.4	11.4	3.5
Nov	27° / 15°	20	3	10.7	7.8
Dec	22° / 10°	12	2.3	10.4	8.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 92% 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 2%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	98	98	98	97	97	97	97	97	97	97	97
Cloudier (%)	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	2	2	2	3	3	3	3	3	3	3	3

	Clearer (%)	Cloudier (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	98	2
21	98	2
22	98	2
23	97	3
24	97	3
25	97	3
26	97	3
27	97	3
28	97	3
29	97	3
30	97	3

Chance of precipitation in September

Any precipitation

Ar Rass gets around 0 mm of rain over 0.1 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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Rain chance (%)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	0
16	0
17	0
18	0
19	0
20	0
21	0
22	0
23	0
24	0
25	0
26	0
27	0
28	0
29	0
30	0

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

Wind in September

Winds average 13 km/h in September.

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

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	13	light breeze
2	13	light breeze
3	13	light breeze
4	13	light breeze
5	13	light breeze
6	13	light breeze
7	13	light breeze
8	13	light breeze
9	13	light breeze
10	13	light breeze
11	13	light breeze
12	13	light breeze
13	13	light breeze
14	13	light breeze
15	13	light breeze
16	13	light breeze
17	13	light breeze
18	13	light breeze
19	13	light breeze
20	13	light breeze
21	13	light breeze
22	13	light breeze
23	13	light breeze
24	13	light breeze
25	13	light breeze
26	13	light breeze
27	13	light breeze
28	13	light breeze
29	13	light breeze
30	13	light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 30 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 42 minutes over September. Sunrise moves from 5:50 AM to 6:02 AM, and sunset from 6:22 PM to 5:49 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.5	12.5	12.5	12.5	12.4	12.4	12.4	12.4	12.3	12.3	12.3	12.3	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.8	11.8	11.8
Sunrise (AM)	5:50	5:50	5:51	5:51	5:51	5:52	5:52	5:53	5:53	5:53	5:54	5:54	5:55	5:55	5:55	5:56	5:56	5:57	5:57	5:57	5:58	5:58	5:59	5:59	6:00	6:00	6:00	6:01	6:01	6:02
Sunset (PM)	6:22	6:21	6:20	6:18	6:17	6:16	6:15	6:14	6:13	6:12	6:11	6:09	6:08	6:07	6:06	6:05	6:04	6:03	6:01	6:00	5:59	5:58	5:57	5:56	5:54	5:53	5:52	5:51	5:50	5:49

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.5	5:50	6:22
2	12.5	5:50	6:21
3	12.5	5:51	6:20
4	12.5	5:51	6:18
5	12.4	5:51	6:17
6	12.4	5:52	6:16
7	12.4	5:52	6:15
8	12.4	5:53	6:14
9	12.3	5:53	6:13
10	12.3	5:53	6:12
11	12.3	5:54	6:11
12	12.3	5:54	6:09
13	12.2	5:55	6:08
14	12.2	5:55	6:07
15	12.2	5:55	6:06
16	12.1	5:56	6:05
17	12.1	5:56	6:04
18	12.1	5:57	6:03
19	12.1	5:57	6:01
20	12.0	5:57	6:00
21	12.0	5:58	5:59
22	12.0	5:58	5:58
23	12.0	5:59	5:57
24	11.9	5:59	5:56
25	11.9	6:00	5:54
26	11.9	6:00	5:53
27	11.9	6:00	5:52
28	11.8	6:01	5:51
29	11.8	6:01	5:50
30	11.8	6:02	5:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.67 kWh/m².

For context, solar energy here swings from a low near 4.04 kWh/m² to a high of 7.83 kWh/m² in June across the year — September's 6.67 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	7.0	7.0	7.0	7.0	6.9	6.9	6.9	6.9	6.8	6.8	6.8	6.8	6.7	6.7	6.7	6.7	6.6	6.6	6.6	6.6	6.5	6.5	6.5	6.5	6.4	6.4	6.4	6.3	6.3	6.3
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense

	Solar energy (kWh/m²)	Level
1	7.0	Intense
2	7.0	Intense
3	7.0	Intense
4	7.0	Intense
5	6.9	Intense
6	6.9	Intense
7	6.9	Intense
8	6.9	Intense
9	6.8	Intense
10	6.8	Intense
11	6.8	Intense
12	6.8	Intense
13	6.7	Intense
14	6.7	Intense
15	6.7	Intense
16	6.7	Intense
17	6.6	Intense
18	6.6	Intense
19	6.6	Intense
20	6.6	Intense
21	6.5	Intense
22	6.5	Intense
23	6.5	Intense
24	6.5	Intense
25	6.4	Intense
26	6.4	Intense
27	6.4	Intense
28	6.3	Intense
29	6.3	Intense
30	6.3	Intense

Planning a trip in September

Hazard calendar for Ar Rass

In seasonPeak

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

Ar Rass sees seasonal dust haze (February–September), heaviest in May.

Dust

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Ar Rass?

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

0.3

Sightseeing

9th-best month of the year

3.1

Beach & pool

9th-best month of the year

September is a weaker month for outdoor sightseeing in Ar Rass.

What to pack for Ar Rass in September

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

In September, Ar Rass sees daytime highs around 40°C and nights near 25°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Ar Rass 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 Ar Rass peaks around July 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 5 (moderate).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	6	7	9	7	10	11	12	11	10	9	6	5
Level	High	Very high	Very high	High	Extreme	Extreme	Extreme	Extreme	Very high	Very high	High	Moderate

	UV index (midday)	Level
Jan	6	High
Feb	7	Very high
Mar	9	Very high
Apr	7	High
May	10	Extreme
Jun	11	Extreme
Jul	12	Extreme
Aug	11	Extreme
Sep	10	Very high
Oct	9	Very high
Nov	6	High
Dec	5	Moderate

Air quality in Ar Rass 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 Ar Rass is worst in March — around 94 µg/m³ PM2.5 (unhealthy), about 2.0× the cleanest month (September, 46 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	68	78	94	84	79	52	49	47	46	48	61	68
Level	Unhealthy	Unhealthy	Unhealthy	Unhealthy	Unhealthy	Poor	Poor	Poor	Poor	Poor	Unhealthy	Unhealthy

	PM2.5 (µg/m³)	Level
Jan	68	Unhealthy
Feb	78	Unhealthy
Mar	94	Unhealthy
Apr	84	Unhealthy
May	79	Unhealthy
Jun	52	Poor
Jul	49	Poor
Aug	47	Poor
Sep	46	Poor
Oct	48	Poor
Nov	61	Unhealthy
Dec	68	Unhealthy

Location & terrain

Where is Ar Rass?

Ar Rass sits at 25.9°N, 43.5°E, 691 m above sea level, in Saudi Arabia. The nearest listed city is Riyāḑ al Khabrā’, 23 km away.

Topography around Ar Rass

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

Within 3 km, the terrain around Ar Rass has only modest variations in elevation — a maximum elevation change of 40 m around an average of 689 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 131 m; within 80 km, large variations in elevation — a maximum elevation change of 680 m.

The land around Ar Rass is covered by artificial surfaces (63%) and bare terrain (32%) within 3 km, bare terrain (93%) within 16 km, and bare terrain (93%) within 80 km.

3 km

40 m

artificial surfaces 63%

16 km

131 m

bare terrain 93%

80 km

680 m

bare terrain 93%

croplandartificial surfacesbare terrain

← August Ar Rass year-round climate October →Best places to visit in September

September weather nearby: Riyāḑ al Khabrā’ 23 km · Al Khabrā’ 26 km · Al Badā’i‘ al Wusţá 27 km · Al Bukayrīyah 34 km · Unaizah 56 km · Buraydah 70 km · ‘Uyūn al Jiwā’ 71 km · Al Mithnab 73 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 Ar Rass (25.8694°, 43.4973°, elevation 691 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).

	Avg high (°C)	Avg low (°C)
1	42	27
2	42	27
3	42	27
4	42	27
5	42	27
6	42	26
7	41	26
8	41	26
9	41	26
10	41	26
11	41	26
12	41	26
13	41	26
14	41	25
15	41	25
16	40	25
17	40	25
18	40	25
19	40	25
20	40	25
21	40	25
22	40	24
23	39	24
24	39	24
25	39	24
26	39	24
27	39	24
28	38	23
29	38	23
30	38	23

	Clearer (%)	Cloudier (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	98	2
21	98	2
22	98	2
23	97	3
24	97	3
25	97	3
26	97	3
27	97	3
28	97	3
29	97	3
30	97	3

	Rain chance (%)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	0
16	0
17	0
18	0
19	0
20	0
21	0
22	0
23	0
24	0
25	0
26	0
27	0
28	0
29	0
30	0

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	42	27
2	42	27
3	42	27
4	42	27
5	42	27
6	42	26
7	41	26
8	41	26
9	41	26
10	41	26
11	41	26
12	41	26
13	41	26
14	41	25
15	41	25
16	40	25
17	40	25
18	40	25
19	40	25
20	40	25
21	40	25
22	40	24
23	39	24
24	39	24
25	39	24
26	39	24
27	39	24
28	38	23
29	38	23
30	38	23

	Clearer (%)	Cloudier (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	98	2
21	98	2
22	98	2
23	97	3
24	97	3
25	97	3
26	97	3
27	97	3
28	97	3
29	97	3
30	97	3

	Rain chance (%)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	0
16	0
17	0
18	0
19	0
20	0
21	0
22	0
23	0
24	0
25	0
26	0
27	0
28	0
29	0
30	0

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	42	27
2	42	27
3	42	27
4	42	27
5	42	27
6	42	26
7	41	26
8	41	26
9	41	26
10	41	26
11	41	26
12	41	26
13	41	26
14	41	25
15	41	25
16	40	25
17	40	25
18	40	25
19	40	25
20	40	25
21	40	25
22	40	24
23	39	24
24	39	24
25	39	24
26	39	24
27	39	24
28	38	23
29	38	23
30	38	23

	Clearer (%)	Cloudier (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	98	2
21	98	2
22	98	2
23	97	3
24	97	3
25	97	3
26	97	3
27	97	3
28	97	3
29	97	3
30	97	3

	Rain chance (%)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	0
13	0
14	0
15	0
16	0
17	0
18	0
19	0
20	0
21	0
22	0
23	0
24	0
25	0
26	0
27	0
28	0
29	0
30	0

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100