Tonj weather in September

In September, Tonj sees average daytime highs of 31°C and overnight lows near 22°C, with 152 mm of rain across 22.4 wet days and about 12 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 14% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 06 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Tonj's 7th-clearest and 12th-windiest month. For the whole year in context, see Tonj's year-round climate.

Daytime high
31°
10th warmest
Overnight low
22°
2nd coldest
Rainfall
152 mm
22.4 wet days
Daylight
12 hours
6:58 AM – 7:01 PM
Cloud cover
67%
7th clearest
Wind
5 km/h
12th windiest
Solar energy
5.72 kWh/m²
Travel score
3.2
out of 10

Tonj is human settlement.

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 31°C through the month.

A typical September day in Tonj reaches about 31°C in the afternoon and slips back to 22°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 32°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13022
23022
33022
43022
53022
63022
73122
83122
93122
103122
113122
123122
133122
143122
153122
163122
173122
183122
193122
203122
213122
223122
233123
243123
253123
263123
273123
283123
293123
303123

How September really feels in Tonj

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.

Tonj weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan36° / 23°10.311.62.8
Feb37° / 24°30.711.81.8
Mar38° / 26°214.5121.4
Apr36° / 26°6313.612.21.8
May34° / 25°1222012.32.5
Jun32° / 23°12720.312.43.1
Jul30° / 23°16322.912.43.4
Aug30° / 22°17823.612.23.3
Sep31° / 22°15222.4123.2
Oct32° / 23°12220.211.83.2
Nov33° / 23°235.711.73.6
Dec35° / 23°20.411.63.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 27% of September, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13367
23565
33664
43664
53763
63862
73961
83961
94159
104159
114258
124357
134357
144456
154456
164357
174456
184456
194357
204357
214357
224258
234258
244159
254159
264159
274060
284060
293961
303862

Chance of precipitation in September

Any precipitation

Tonj gets around 152 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 78% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
178
278
378
477
577
677
776
876
975
1075
1175
1274
1374
1474
1573
1673
1773
1873
1973
2073
2173
2273
2373
2473
2573
2673
2773
2873
2973
3073

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 97% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)
1397
2397
3397
4397
5397
6397
7397
8397
9397
10397
11397
12397
13397
14397
15397
16397
17397
18397
19397
20397
21397
22397
23397
24397
25397
26397
27397
28397
29397
30496

Wind in September

Winds average 5 km/h in September, the calmest month.

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 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over September. Sunrise moves from 7:01 AM to 6:56 AM, and sunset from 7:09 PM to 6:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.17:017:09
212.17:017:09
312.17:017:08
412.17:007:08
512.17:007:07
612.17:007:06
712.17:007:06
812.17:007:05
912.17:007:05
1012.16:597:04
1112.16:597:04
1212.16:597:03
1312.16:597:03
1412.16:597:02
1512.06:597:01
1612.06:587:01
1712.06:587:00
1812.06:587:00
1912.06:586:59
2012.06:586:58
2112.06:586:58
2212.06:576:57
2312.06:576:57
2412.06:576:56
2512.06:576:56
2612.06:576:55
2712.06:576:55
2812.06:576:54
2912.06:566:53
3011.96:566:53

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.72 kWh/m².

For context, solar energy here swings from a low near 5.14 kWh/m² to a high of 6.46 kWh/m² in February across the year — September's 5.72 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Hazard calendar for Tonj

In seasonPeak

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

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

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

Is September a good time to visit Tonj?

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

3.2
Sightseeing
5th-best month of the year
4.7
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Tonj.

What to pack for Tonj in September

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

In September, Tonj sees daytime highs around 31°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Tonj in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tonj peaks around March 21 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 21UV 13Dec 12UV 9
UV index (midday)Level
Jan11Extreme
Feb11Extreme
Mar14Extreme
Apr13Extreme
May11Extreme
Jun11Extreme
Jul11Extreme
Aug13Extreme
Sep12Extreme
Oct12Extreme
Nov10Very high
Dec9Very high

Air quality in Tonj 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 Tonj is worst in December — around 50 µg/m³ PM2.5 (poor), about 4.6× the cleanest month (August, 11 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateGoodModeratePoorDec 1349 µg/m³Aug 2411 µg/m³
PM2.5 (µg/m³)Level
Jan39Poor
Feb42Poor
Mar44Poor
Apr24Moderate
May12Good
Jun15Moderate
Jul14Moderate
Aug11Good
Sep11Good
Oct16Moderate
Nov46Poor
Dec50Poor
Location & terrain

Where is Tonj?

Tonj sits at 7.3°N, 28.7°E, 444 m above sea level, in South Sudan. The nearest listed city is Wau, 89 km away.

WauRumbekKuacjokGogrialLeerAweilWinejokAbyei

Topography around Tonj

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

Within 3 km, the terrain around Tonj has only modest variations in elevation — a maximum elevation change of 21 m around an average of 437 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 73 m; within 80 km, only modest variations in elevation — a maximum elevation change of 176 m.

The land around Tonj is covered by grassland (79%) within 3 km, grassland (64%) and shrubs (23%) within 16 km, and grassland (53%) and shrubs (32%) within 80 km.

3 km
21 m
16 km
73 m
80 km
176 m
treesshrubsgrasslandcroplandartificial surfaceswetland
September weather nearby: Wau 89 km · Rumbek 122 km · Kuacjok 138 km · Gogrial 154 km · Leer 198 km · Aweil 218 km · Winejok 228 km · Abyei 260 km

South Sudan travel facts

Travel advisory
Level 4
Do Not Travel
Prices
≈ 6% of US
price level, 2021
GDP per capita
$1,080
2015
Happiness
2.8 / 10
World Happiness, 2019
Homicide rate
14
per 100k, 2012
Road deaths
36.7
per 100k/yr, 2019
Income group
Low
World Bank
Religion
Christian 61%folk religion 33%Muslim 6%

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 Tonj (7.2739°, 28.6775°, elevation 444 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).