Aru weather in September

In September, Aru sees average daytime highs of 26°C and overnight lows near 17°C, with 166 mm of rain across 22.4 wet days and about 12 hours of daylight. It is the 9th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 8% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Aru's 9th-clearest and 9th-windiest month. For the whole year in context, see Aru's year-round climate.

Daytime high
26°
9th warmest
Overnight low
17°
3rd coldest
Rainfall
166 mm
22.4 wet days
Daylight
12 hours
5:50 AM – 5:51 PM
Cloud cover
72%
9th clearest
Wind
5 km/h
9th windiest
Solar energy
5.51 kWh/m²
Travel score
4.6
out of 10

Aru is place in Ituri Province, Democratic Republic of the Congo.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 26°C through the month.

A typical September day in Aru reaches about 26°C in the afternoon and slips back to 17°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 28°C. Set against its neighbours, September runs on par with August and on par with October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12616
22616
32616
42616
52616
62616
72616
82616
92616
102617
112617
122617
132617
142617
152617
162617
172617
182617
192617
202617
212617
222617
232617
242617
252617
262617
272617
282617
292617
302617

Aru weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 18°183.211.96.1
Feb30° / 19°304.911.95.2
Mar29° / 19°9212.9124.8
Apr28° / 18°15219.212.14.7
May27° / 18°14818.212.15.1
Jun26° / 17°15519.912.25.0
Jul26° / 17°17222.612.14.7
Aug26° / 16°1892512.14.4
Sep26° / 17°16622.4124.6
Oct26° / 17°19424.311.94.4
Nov27° / 17°11917.111.95.3
Dec28° / 18°386.111.86.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 70%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12773
22872
32872
42872
52971
63070
73070
83169
93268
103367
113466
123466
133466
143565
153565
163466
173466
183367
193367
203268
213268
223070
232971
242872
252674
262575
272575
282377
292278
302278

Chance of precipitation in September

Any precipitation

Aru gets around 166 mm of rain over 22.4 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 74% and peaks near 80% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
180
280
379
479
579
678
778
877
976
1075
1174
1273
1373
1472
1571
1671
1771
1870
1970
2071
2171
2271
2372
2473
2573
2674
2775
2875
2976
3076

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

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

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)
13970
23970
33970
43970
53970
63970
73970
83970
93970
103961
113961
123961
133961
143961
153961
163961
173961
183961
193961
202971
212971
222971
232971
242971
252971
262971
271981
281981
291981
301981

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over September. Sunrise moves from 5:55 AM to 5:47 AM, and sunset from 5:58 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.15:555:58
212.15:545:58
312.05:545:57
412.05:545:57
512.05:545:56
612.05:535:56
712.05:535:55
812.05:535:55
912.05:535:55
1012.05:525:54
1112.05:525:54
1212.05:525:53
1312.05:515:53
1412.05:515:52
1512.05:515:52
1612.05:505:51
1712.05:505:51
1812.05:505:51
1912.05:505:50
2012.05:495:50
2112.05:495:49
2212.05:495:49
2312.05:485:48
2412.05:485:48
2512.05:485:47
2612.05:485:47
2712.05:475:47
2812.05:475:46
2912.05:475:46
3012.05:475:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.51 kWh/m².

For context, solar energy here swings from a low near 4.93 kWh/m² to a high of 6.13 kWh/m² in February across the year — September's 5.51 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.4Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Is September a good time to visit Aru?

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

4.6
Sightseeing
10th-best month of the year
4.4
Beach & pool
10th-best month of the year

September is a reasonable time to visit Aru for sightseeing.

What to pack for Aru in September

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

In September, Aru sees daytime highs around 26°C and nights near 17°C. Pack rain gear. Worth having: light clothes and sun protection. About 22 days see rain.

rain gearlight clothessun protection

UV index in Aru in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Aru peaks around March 17 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 16Jul 12UV 10
UV index (midday)Level
Jan12Extreme
Feb14Extreme
Mar16Extreme
Apr14Extreme
May12Extreme
Jun11Extreme
Jul10Very high
Aug12Extreme
Sep13Extreme
Oct13Extreme
Nov11Extreme
Dec10Extreme

Air quality in Aru 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 Aru is worst in January — around 55 µg/m³ PM2.5 (poor), about 2.8× the cleanest month (April, 19 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorJan 1953 µg/m³Apr 2320 µg/m³
PM2.5 (µg/m³)Level
Jan55Poor
Feb48Poor
Mar30Moderate
Apr19Moderate
May20Moderate
Jun28Moderate
Jul30Moderate
Aug25Moderate
Sep22Moderate
Oct22Moderate
Nov26Moderate
Dec40Poor
Location & terrain

Where is Aru?

Aru sits at 2.9°N, 30.8°E, 1,350 m above sea level, in Democratic Republic of the Congo. The nearest listed city is Arua, 19 km away.

Adjumani

Topography around Aru

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

Within 3 km, the terrain around Aru has only modest variations in elevation — a maximum elevation change of 69 m around an average of 1,341 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 600 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,580 m.

The land around Aru is covered by shrubs (30%), grassland (22%) and artificial surfaces (20%) within 3 km, shrubs (59%) within 16 km, and shrubs (40%), grassland (32%) and trees (22%) within 80 km.

3 km
69 m
16 km
600 m
80 km
1,580 m
treesshrubsgrasslandcroplandartificial surfaceswetland
September weather nearby: Arua 19 km · Nebbi 51 km · Paidha 52 km · Koboko 63 km · Yumbe 81 km · Pakwach 85 km · Djugu 111 km · Adjumani 120 km

Democratic Republic of the Congo travel facts

Travel advisory
Level 4
Do Not Travel
Power plugs
Type C / E
220 V · 50 Hz
Prices
≈ 42% of US
price level, 2025
GDP per capita
$807
2025
Happiness
3.8 / 10
World Happiness, 2025
Safe drinking water
12%
of population, 2024
Road deaths
34.9
per 100k/yr, 2019
Income group
Low
World Bank
English
Very low
EF EPI 400

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 Aru (2.8622°, 30.8414°, elevation 1,350 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).