Dellys weather in September

In September, Dellys sees average daytime highs of 24°C and overnight lows near 23°C, with 35 mm of rain across 5.4 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 23°C by the end. The sky is clear or mostly clear about 61% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Dellys's 4th-clearest and 9th-windiest month. For the whole year in context, see Dellys's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
23°
10th coldest
Rainfall
35 mm
5.4 wet days
Daylight
12 h 12 min
6:32 AM – 6:46 PM
Cloud cover
36%
4th clearest
Wind
17 km/h
9th windiest
Solar energy
5.2 kWh/m²
Travel score
8.1
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 25°C in the first days to 23°C by the end.

A typical September day in Dellys reaches about 24°C in the afternoon and slips back to 23°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 26°C. Set against its neighbours, September runs about 1°C cooler than August and about 3°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12524
22524
32524
42524
52524
62523
72523
82523
92523
102523
112523
122523
132523
142423
152423
162423
172422
182422
192422
202422
212422
222422
232422
242422
252422
262322
272322
282321
292321
302321

Dellys weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan14° / 12°12612.99.84.2
Feb14° / 12°9610.610.64.2
Mar15° / 13°778.811.75.0
Apr17° / 14°648.112.95.7
May19° / 17°475.613.97.1
Jun22° / 20°71.414.58.7
Jul25° / 23°10.314.39.4
Aug26° / 24°51.213.48.9
Sep24° / 23°355.412.38.1
Oct22° / 20°687.8117.2
Nov18° / 16°13213.1105.7
Dec16° / 13°13212.19.54.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 61% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 25%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18416
28218
38119
48119
57921
67921
77822
87822
97723
107723
117624
127624
137624
147525
157525
167426
177426
187426
197327
207228
217228
227228
237228
247228
257129
267129
277228
287228
297228
307228

Chance of precipitation in September

Any precipitation

Dellys gets around 35 mm of rain over 5.4 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 18% and peaks near 24% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
110
210
311
411
512
613
713
814
914
1015
1116
1216
1317
1418
1518
1619
1720
1820
1921
2022
2122
2223
2323
2423
2524
2624
2724
2824
2924
3024

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 42% of days. Sticky, muggy-or-worse air turns up on roughly 70% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1011034532
2011136502
3011237482
4011338462
5021439441
6021540421
7021641401
8021742381
9031842361
10031943351
11042043330
12042143310
13052243300
14052343280
15062443270
16062443260
17072543240
18082643230
19082743210
20092743200
21192843180
221102944170
231112944160
241113044140
251123044130
261123044120
271133144110
281143143100
292143243100
30215324290

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 6:19 AM to 6:44 AM, and sunset from 7:09 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:197:09
212.86:207:07
312.86:217:06
412.76:227:04
512.76:237:03
612.66:237:01
712.66:247:00
812.66:256:58
912.56:266:57
1012.56:276:55
1112.46:286:54
1212.46:286:52
1312.46:296:50
1412.36:306:49
1512.36:316:47
1612.26:326:46
1712.26:336:44
1812.26:336:42
1912.16:346:41
2012.16:356:39
2112.06:366:38
2212.06:376:36
2311.96:386:35
2411.96:386:33
2511.96:396:31
2611.86:406:30
2711.86:416:28
2811.76:426:27
2911.76:436:25
3011.76:446:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.2 kWh/m².

For context, solar energy here swings from a low near 2.22 kWh/m² to a high of 7.46 kWh/m² in July across the year — September's 5.2 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
25.9Bright
35.8Bright
45.8Bright
55.8Bright
65.7Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.4Bright
125.4Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.1Bright
185.1Bright
195.0Bright
205.0Bright
214.9Bright
224.9Bright
234.8Bright
244.8Bright
254.7Bright
264.7Bright
274.7Bright
284.6Bright
294.6Bright
304.5Bright
Planning a trip in September

Hazard calendar for Dellys

In seasonPeak

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

Dellys's rainy season runs October–April, when most of the year's rain falls.

Dellys sees seasonal dust haze (June–July), heaviest in July.

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

Is September a good time to visit Dellys?

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

8.1
Sightseeing
4th-best month of the year
6.9
Beach & pool
3rd-best month of the year

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

What to pack for Dellys in September

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

In September, Dellys sees daytime highs around 24°C and nights near 23°C. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Dellys in September

The nearest coast averages about 25°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 19 km away) is warmest in August at about 25°C and coldest in February near 15°C.

It's comfortable for a long swim from Jun 5 to Nov 7 — about 5.1 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar15Cool
Apr16Cool
May18Cool
Jun21Refreshing
Jul24Refreshing
Aug25Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Dellys 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 Dellys peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 16UV 9Dec 20UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar6High
Apr8Very high
May7Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep7High
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Dellys 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 Dellys is worst in August — around 64 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorUnhealthyPoorAug 1063 µg/m³Nov 1844 µg/m³
PM2.5 (µg/m³)Level
Jan47Poor
Feb53Poor
Mar59Unhealthy
Apr57Unhealthy
May55Poor
Jun51Poor
Jul63Unhealthy
Aug64Unhealthy
Sep47Poor
Oct55Unhealthy
Nov43Poor
Dec50Poor
Location & terrain

Where is Dellys?

Dellys sits at 36.9°N, 3.9°E, 63 m above sea level, in Algeria. The nearest listed city is Tadmaït, 19 km away.

Topography around Dellys

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

Within 3 km, the terrain around Dellys has significant variations in elevation — a maximum elevation change of 374 m around an average of 61 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 890 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,266 m.

The land around Dellys is covered by water (59%) within 3 km, water (56%) within 16 km, and water (38%), trees (27%) and grassland (20%) within 80 km.

3 km
374 m
16 km
890 m
80 km
2,266 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Tadmaït 19 km · Makouda 20 km · Naciria 20 km · Draa Ben Khedda 21 km · Boudjima 25 km · Tizi Ouzou 26 km · Bordj Menaïel 26 km · Tirmitine 30 km

Algeria travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 33% of US
price level, 2025
GDP per capita
$6,051
2025
Happiness
5.7 / 10
World Happiness, 2025
Safe drinking water
69%
of population, 2024
Homicide rate
1.2
per 100k, 2023
Road deaths
20.9
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 468
Religion
Muslim 99%

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 Dellys (36.9172°, 3.9131°, elevation 63 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).