Sumbawanga weather in September

In September, Sumbawanga sees average daytime highs of 25°C and overnight lows near 14°C, with 8 mm of rain across 1.1 wet days and about 12 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 44% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Sumbawanga's 4th-clearest and 2nd-windiest month. For the whole year in context, see Sumbawanga's year-round climate.

Daytime high
25°
2nd warmest
Overnight low
14°
7th coldest
Rainfall
8 mm
1.1 wet days
Daylight
12 hours
6:49 AM – 6:47 PM
Cloud cover
45%
4th clearest
Wind
9 km/h
2nd windiest
Solar energy
6.79 kWh/m²
Travel score
8.5
out of 10

Sumbawanga is city located in western Tanzania.

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 25°C through the month.

A typical September day in Sumbawanga reaches about 25°C in the afternoon and slips back to 14°C overnight — a 11°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 warmer than August and on par with October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12413
22413
32413
42413
52413
62413
72413
82513
92514
102514
112514
122514
132514
142514
152514
162514
172514
182514
192514
202514
212514
222514
232515
242515
252515
262515
272515
282515
292515
302515

Sumbawanga weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 14°30428.412.43.7
Feb22° / 14°23923.612.34.0
Mar22° / 14°2792612.14.1
Apr22° / 14°16018.811.85.2
May23° / 13°305.111.67.7
Jun23° / 11°20.211.58.6
Jul23° / 11°10.211.68.7
Aug24° / 12°20.411.78.8
Sep25° / 14°81.1128.5
Oct25° / 15°405.712.27.4
Nov24° / 15°14815.612.45.7
Dec22° / 14°28226.412.54.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% 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 28%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17426
27327
37228
47228
57129
67129
77228
87228
97228
107228
117228
127327
137327
147426
157426
167426
177426
187426
197426
207327
217327
227327
237228
247030
257030
266931
276832
286733
296535
306436

Chance of precipitation in September

Any precipitation

Sumbawanga gets around 8 mm of rain over 1.1 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 4% and peaks near 8% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
13
23
34
44
54
64
74
84
94
104
114
124
134
143
153
163
173
183
193
203
213
223
233
244
254
265
276
286
297
308

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 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
6982
7982
8982
9982
10982
11982
12982
13982
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24982
25982
26982
27973
28973
29964
30964

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over September. Sunrise moves from 6:58 AM to 6:41 AM, and sunset from 6:49 PM to 6:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:586:49
211.96:576:49
311.96:576:48
411.96:566:48
511.96:566:48
611.96:556:48
711.96:546:48
811.96:546:48
911.96:536:48
1011.96:536:47
1111.96:526:47
1211.96:526:47
1311.96:516:47
1411.96:506:47
1511.96:506:47
1612.06:496:47
1712.06:496:46
1812.06:486:46
1912.06:476:46
2012.06:476:46
2112.06:466:46
2212.06:466:46
2312.06:456:46
2412.06:446:45
2512.06:446:45
2612.06:436:45
2712.06:436:45
2812.06:426:45
2912.16:426:45
3012.16:416:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.79 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 5.08 kWh/m² to a high of 6.79 kWh/m² in September across the year — September's 6.79 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.6Intense
26.6Intense
36.6Intense
46.6Intense
56.6Intense
66.6Intense
76.6Intense
86.7Intense
96.7Intense
106.7Intense
116.7Intense
126.7Intense
136.8Intense
146.8Intense
156.8Intense
166.8Intense
176.8Intense
186.8Intense
196.9Intense
206.9Intense
216.9Intense
226.9Intense
236.9Intense
246.9Intense
256.9Intense
266.9Intense
276.9Intense
286.9Intense
296.9Intense
306.9Intense
Planning a trip in September

Hazard calendar for Sumbawanga

In seasonPeak

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

Sumbawanga sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Sumbawanga's monsoon runs November–April, when most of the year's rain falls.

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

Is September a good time to visit Sumbawanga?

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

8.5
Sightseeing
4th-best month of the year
7.5
Beach & pool
1st-best month of the year

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

What to pack for Sumbawanga in September

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

In September, Sumbawanga sees daytime highs around 25°C and nights near 14°C. Pack sun protection. Worth having: light clothes.

sun protectionlight clothes

UV index in Sumbawanga 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 Sumbawanga peaks around February 19 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 19UV 16Jun 17UV 10
UV index (midday)Level
Jan16Extreme
Feb17Extreme
Mar16Extreme
Apr15Extreme
May11Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep13Extreme
Oct14Extreme
Nov13Extreme
Dec14Extreme

Air quality in Sumbawanga 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 Sumbawanga is worst in September — around 23 µg/m³ PM2.5 (moderate), about 3.8× the cleanest month (May, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1223 µg/m³May 146 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb11Good
Mar9Good
Apr7Good
May6Good
Jun9Good
Jul15Moderate
Aug21Moderate
Sep23Moderate
Oct18Moderate
Nov11Good
Dec8Good
Location & terrain

Where is Sumbawanga?

Sumbawanga sits at 8.0°S, 31.6°E, 1,833 m above sea level, in Tanzania. The nearest listed city is Matai, 39 km away.

NamanyereLaelaMbalaMpulunguUseviaKirando

Topography around Sumbawanga

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

Within 3 km, the terrain around Sumbawanga has only modest variations in elevation — a maximum elevation change of 126 m around an average of 1,833 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,171 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,666 m.

The land around Sumbawanga is covered by artificial surfaces (44%) and cropland (34%) within 3 km, cropland (55%) and grassland (21%) within 16 km, and cropland (32%), trees (20%) and water (20%) within 80 km.

3 km
126 m
16 km
1,171 m
80 km
1,666 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Matai 39 km · Chala 57 km · Namanyere 80 km · Laela 82 km · Mbala 101 km · Mpulungu 104 km · Usevia 105 km · Kirando 128 km

Tanzania travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type D / G
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$1,319
2025
Happiness
3.9 / 10
World Happiness, 2025
Safe drinking water
31%
of population, 2024
Homicide rate
3.7
per 100k, 2020
Road deaths
31.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Low
EF EPI 479
Religion
Christian 63%Muslim 34%folk religion 1%

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 Sumbawanga (-7.9667°, 31.6167°, elevation 1,833 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).