Siwa weather in September

In September, Siwa sees average daytime highs of 34°C and overnight lows near 22°C, with 0 mm of rain across 0 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 35°C in the first days to 33°C by the end. The sky is clear or mostly clear about 98% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Siwa's 3rd-clearest and 10th-windiest month. For the whole year in context, see Siwa's year-round climate.

Daytime high
34°
4th warmest
Overnight low
22°
10th coldest
Rainfall
0 mm
0 wet days
Daylight
12 h 12 min
6:07 AM – 6:17 PM
Cloud cover
3%
3rd clearest
Wind
12 km/h
10th windiest
Solar energy
6.54 kWh/m²
Travel score
4.1
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 35°C in the first days to 33°C by the end.

A typical September day in Siwa reaches about 34°C in the afternoon and slips back to 22°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 38°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13623
23623
33523
43523
53523
63523
73522
83522
93522
103522
113522
123522
133522
143422
153422
163422
173422
183422
193422
203422
213421
223421
233421
243321
253321
263321
273321
283321
293321
303321

How September really feels in Siwa

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
heat index over the day's high
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.

Siwa 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan18° / 20.510.37.8
Feb20° / 30.7118.3
Mar24° / 11°20.411.89.2
Apr28° / 15°00.112.77.8
May33° / 19°00.113.45.0
Jun36° / 22°0013.82.9
Jul37° / 23°0013.72.2
Aug37° / 24°00132.4
Sep34° / 22°0012.24.1
Oct30° / 18°0011.37.0
Nov24° / 13°10.210.59.0
Dec20° / 20.510.28.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 98% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 1% of September, with mostly cloudy or overcast conditions the remaining 1%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
18991
19991
20991
21991
22991
23991
24991
25991
26982
27982
28973
29973
30973

Chance of precipitation in September

Any precipitation

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

By dew point, September lands in the comfortable band about 51% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12252251
22252251
32353240
42353240
52453230
62453230
72553220
82553220
92653210
102753200
112852200
122853190
132953180
143052180
153053170
163152170
173252160
183352150
193452140
203551140
213750130
223849130
233949120
244048120
254048120
264148110
274247110
284347100
294447100
30454690

Wind in September

Winds average 12 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light 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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 36 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 48 minutes over September. Sunrise moves from 5:59 AM to 6:15 AM, and sunset from 6:36 PM to 6:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:596:36
212.66:006:35
312.66:006:34
412.56:016:32
512.56:016:31
612.56:026:30
712.46:026:29
812.46:036:28
912.46:036:26
1012.46:046:25
1112.36:046:24
1212.36:056:23
1312.36:056:21
1412.26:066:20
1512.26:076:19
1612.26:076:17
1712.16:086:16
1812.16:086:15
1912.16:096:14
2012.16:096:12
2112.06:106:11
2212.06:106:10
2312.06:116:09
2411.96:116:07
2511.96:126:06
2611.96:126:05
2711.86:136:04
2811.86:146:02
2911.86:146:01
3011.86:156:00

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.54 kWh/m².

For context, solar energy here swings from a low near 3.68 kWh/m² to a high of 8.18 kWh/m² in June across the year — September's 6.54 kWh/m² falls in the middle.

02468151015202530
Solar energy (kWh/m²)Level
17.0Intense
27.0Intense
37.0Intense
47.0Intense
56.9Intense
66.9Intense
76.8Intense
86.8Intense
96.8Intense
106.8Intense
116.7Intense
126.7Intense
136.6Intense
146.6Intense
156.6Intense
166.5Intense
176.5Intense
186.5Intense
196.4Intense
206.4Intense
216.3Intense
226.3Intense
236.3Intense
246.2Intense
256.2Intense
266.1Intense
276.1Intense
286.1Intense
296.0Intense
306.0Bright
Planning a trip in September

Hazard calendar for Siwa

In seasonPeak

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

Siwa sees seasonal dust haze (March–June), heaviest in May.

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

Is September a good time to visit Siwa?

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

4.1
Sightseeing
9th-best month of the year
7.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Siwa for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Siwa in September

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

In September, Siwa sees daytime highs around 34°C and nights near 22°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Siwa 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 Siwa peaks around August 13 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 14 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateAug 13UV 11Jan 14UV 4
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar7Very high
Apr10Extreme
May11Extreme
Jun11Extreme
Jul11Extreme
Aug12Extreme
Sep10Very high
Oct8Very high
Nov6High
Dec4Moderate

Air quality in Siwa 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 Siwa is worst in March — around 51 µg/m³ PM2.5 (poor), about 1.9× the cleanest month (November, 26 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateMar 2151 µg/m³Nov 1127 µg/m³
PM2.5 (µg/m³)Level
Jan46Poor
Feb43Poor
Mar51Poor
Apr49Poor
May48Poor
Jun43Poor
Jul35Moderate
Aug33Moderate
Sep31Moderate
Oct28Moderate
Nov26Moderate
Dec32Moderate
Location & terrain

Where is Siwa?

Siwa sits at 29.2°N, 25.5°E, -15 m above sea level, in Egypt. The nearest listed city is As Sallūm, 264 km away.

As SallūmAn-NajaylahSīdī BarānīMarsá MaţrūḩAl BawīţīEl DabaaAl Ḩammām

Topography around Siwa

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

Within 3 km, the terrain around Siwa has only modest variations in elevation — a maximum elevation change of 27 m around an average of -12 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 139 m; within 80 km, significant variations in elevation — a maximum elevation change of 262 m.

The land around Siwa is covered by trees (44%) and bare terrain (33%) within 3 km, bare terrain (87%) within 16 km, and bare terrain (99%) within 80 km.

3 km
27 m
16 km
139 m
80 km
262 m
treesshrubscroplandartificial surfacesbare terrainwater
September weather nearby: As Sallūm 264 km · An-Najaylah 265 km · Sīdī Barānī 271 km · Marsá Maţrūḩ 290 km · Al Bawīţī 340 km · El Dabaa 347 km · Tobruk 354 km · Al Ḩammām 415 km

Egypt travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
220 V · 50 Hz
Prices
≈ 15% of US
price level, 2025
GDP per capita
$3,086
2025
Happiness
3.9 / 10
World Happiness, 2025
Safe drinking water
79%
of population, 2024
Homicide rate
1.3
per 100k, 2017
Road deaths
10.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Low
EF EPI 459
Religion
Muslim 90%Christian 10%

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 Siwa (29.2032°, 25.5196°, elevation -15 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).