Mwanza weather in September

In September, Mwanza sees average daytime highs of 28°C and overnight lows near 17°C, with 15 mm of rain across 3.1 wet days and about 11.9 hours of daylight. It is the 4th-warmest and 12th-wettest month of the year here.

Highs climb over the month, from about 27°C in the first days to 29°C by the end. The sky is clear or mostly clear about 74% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 42 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Mwanza's 1st-clearest and 2nd-windiest month. For the whole year in context, see Mwanza's year-round climate.

Daytime high
28°
4th warmest
Overnight low
17°
5th coldest
Rainfall
15 mm
3.1 wet days
Daylight
11 h 54 min
5:39 AM – 5:34 PM
Cloud cover
25%
1st clearest
Wind
11 km/h
2nd windiest
Solar energy
6.27 kWh/m²
Travel score
7.6
out of 10

Mwanza is human settlement in Malawi.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 27°C in the first days to 29°C by the end.

A typical September day in Mwanza reaches about 28°C in the afternoon and slips back to 17°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 32°C. Set against its neighbours, September runs about 3°C warmer than August and about 2°C cooler than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12615
22615
32715
42715
52716
62716
72716
82716
92716
102716
112816
122816
132816
142817
152817
162817
172817
182817
192917
202917
212917
222917
232917
242918
252918
262918
272918
282918
292918
302918

Mwanza weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 20°35225.912.84.0
Feb27° / 20°23021.312.54.4
Mar27° / 19°18020.212.15.0
Apr26° / 17°7312.111.76.6
May24° / 15°245.911.38.0
Jun23° / 13°245.811.17.8
Jul22° / 12°347.111.27.5
Aug25° / 14°163.311.58.5
Sep28° / 17°153.111.97.6
Oct30° / 19°355.412.45.9
Nov30° / 20°9511.812.74.7
Dec28° / 20°25222.612.94.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 74% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 11%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18812
28812
38812
48911
58911
68911
78812
88812
98812
108812
118812
128812
138911
148911
158911
168911
178911
188911
198911
209010
219010
229010
239010
248911
258911
268911
278812
288911
298812
308812

Chance of precipitation in September

Any precipitation

Mwanza gets around 15 mm of rain over 3.1 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 10% and peaks near 14% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
19
29
39
49
59
69
710
810
910
1010
1110
1210
1310
1410
1510
1610
1710
1810
1910
2010
2110
2210
2311
2411
2511
2612
2712
2813
2913
3014

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 70% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1791920
2791920
3791920
4781930
5781930
6772030
7772030
8772030
9762040
10762040
11762040
12752140
13742150
14732250
15732250
16722350
17712450
18702460
19692560
20692560
21682660
22662770
23652870
24623080
25613180
26593290
27583390
285634100
295535100
305236111

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 42 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 24 minutes over September. Sunrise moves from 5:51 AM to 5:28 AM, and sunset from 5:32 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.75:515:32
211.75:505:32
311.75:495:33
411.75:495:33
511.85:485:33
611.85:475:33
711.85:465:33
811.85:455:33
911.85:455:33
1011.85:445:33
1111.85:435:33
1211.95:425:33
1311.95:415:33
1411.95:405:33
1511.95:405:34
1611.95:395:34
1711.95:385:34
1811.95:375:34
1912.05:365:34
2012.05:365:34
2112.05:355:34
2212.05:345:34
2312.05:335:34
2412.05:325:34
2512.05:315:34
2612.15:315:34
2712.15:305:35
2812.15:295:35
2912.15:285:35
3012.15:285:35

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.27 kWh/m².

For context, solar energy here swings from a low near 4.32 kWh/m² to a high of 6.64 kWh/m² in October across the year — September's 6.27 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.9Bright
35.9Bright
45.9Bright
56.0Bright
66.0Bright
76.0Intense
86.0Intense
96.1Intense
106.1Intense
116.1Intense
126.2Intense
136.2Intense
146.2Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.5Intense
246.5Intense
256.5Intense
266.5Intense
276.5Intense
286.5Intense
296.5Intense
306.5Intense
Planning a trip in September

Hazard calendar for Mwanza

In seasonPeak

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

Mwanza's monsoon runs December–March, when most of the year's rain falls.

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

Is September a good time to visit Mwanza?

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

7.6
Sightseeing
4th-best month of the year
8.5
Beach & pool
1st-best month of the year

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

What to pack for Mwanza in September

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

In September, Mwanza sees daytime highs around 28°C and nights near 17°C. Pack light clothes and sun protection. About 3 days see rain.

light clothessun protection

UV index in Mwanza in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mwanza peaks around January 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeJan 18UV 15Jun 21UV 8
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar14Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep11Extreme
Oct12Extreme
Nov13Extreme
Dec14Extreme

Air quality in Mwanza 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 Mwanza is worst in September — around 70 µg/m³ PM2.5 (unhealthy), about 5.4× the cleanest month (January, 13 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorUnhealthyModerateSep 1467 µg/m³Jan 1213 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb16Moderate
Mar18Moderate
Apr20Moderate
May27Moderate
Jun29Moderate
Jul37Poor
Aug51Poor
Sep70Unhealthy
Oct40Poor
Nov19Moderate
Dec14Moderate
Location & terrain

Where is Mwanza?

Mwanza sits at 15.6°S, 34.5°E, 654 m above sea level, in Malawi. The nearest listed city is Blantyre, 56 km away.

BlantyreBalakaNtcheuZombaLiwondeUlonguéMoatizeMulanje

Topography around Mwanza

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

Within 3 km, the terrain around Mwanza has significant variations in elevation — a maximum elevation change of 348 m around an average of 666 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,150 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,754 m.

The land around Mwanza is covered by trees (36%), cropland (28%) and shrubs (21%) within 3 km, shrubs (35%), grassland (23%) and cropland (21%) within 16 km, and shrubs (28%), trees (24%) and grassland (24%) within 80 km.

3 km
348 m
16 km
1,150 m
80 km
1,754 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Blantyre 56 km · Balaka 83 km · Ntcheu 88 km · Zomba 88 km · Liwonde 96 km · Ulongué 99 km · Moatize 102 km · Mulanje 115 km

Malawi travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type G
230 V · 50 Hz
Prices
≈ 53% of US
price level, 2025
GDP per capita
$672
2025
Happiness
3.3 / 10
World Happiness, 2025
Safe drinking water
18%
of population, 2024
Homicide rate
1.8
per 100k, 2012
Road deaths
33.4
per 100k/yr, 2019
Income group
Low
World Bank
English
Low
EF EPI 465
Religion
Protestant 34%other Christian 27%Roman Catholic 17%Muslim 14%

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 Mwanza (-15.6026°, 34.5248°, elevation 654 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).