Kisumu weather in September

In September, Kisumu sees average daytime highs of 26°C and overnight lows near 18°C, with 106 mm of rain across 19.6 wet days and about 12 hours of daylight. It is the 5th-warmest and 8th-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 22% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Kisumu's 3rd-clearest and 5th-windiest month. For the whole year in context, see Kisumu's year-round climate.

Daytime high
26°
5th warmest
Overnight low
18°
7th coldest
Rainfall
106 mm
19.6 wet days
Daylight
12 hours
6:35 AM – 6:35 PM
Cloud cover
60%
3rd clearest
Wind
6 km/h
5th windiest
Solar energy
6.16 kWh/m²
Travel score
5.2
out of 10

Kisumu is city in Kenya.

Density
1,340/km²
people per km²
Founded
1901

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 Kisumu reaches about 26°C in the afternoon and slips back to 18°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 27°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)
12518
22518
32518
42518
52518
62518
72518
82518
92618
102618
112618
122618
132618
142618
152618
162618
172618
182618
192618
202618
212618
222618
232618
242618
252618
262618
272618
282618
292618
302618

Kisumu weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 18°11615.7125.8
Feb28° / 19°8813125.8
Mar27° / 19°18220.3125.0
Apr25° / 19°28127123.9
May25° / 18°20626.3124.3
Jun25° / 18°10320.7125.1
Jul25° / 18°9218.1125.6
Aug25° / 18°10019.3125.4
Sep26° / 18°10619.6125.2
Oct26° / 18°19425.5124.3
Nov25° / 18°24725.1124.2
Dec26° / 18°17920.7125.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 30% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25545
35545
45545
55644
65644
75644
85644
95644
105644
115644
125644
135644
145644
155545
165446
175446
185248
195149
205149
215050
224951
234852
244852
254555
264555
274456
284456
294258
304258

Chance of precipitation in September

Any precipitation

Kisumu gets around 106 mm of rain over 19.6 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 66% and peaks near 75% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
163
263
363
463
563
664
764
864
964
1065
1165
1265
1364
1464
1564
1664
1764
1864
1965
2065
2166
2266
2367
2468
2569
2670
2771
2872
2973
3075

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 72% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)
13961
23862
33763
43763
53664
63565
73466
83367
93367
103268
113169
123169
133070
142971
152971
162872
172773
182674
192674
202575
212476
222377
232278
242179
252080
262080
271981
281882
291783
301684

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

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

Days grow by about 0 minutes over September. Sunrise moves from 6:41 AM to 6:30 AM, and sunset from 6:41 PM to 6:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:416:41
212.06:406:40
312.06:406:40
412.06:406:40
512.06:396:39
612.06:396:39
712.06:396:39
812.06:386:38
912.06:386:38
1012.06:386:37
1112.06:376:37
1212.06:376:37
1312.06:366:36
1412.06:366:36
1512.06:366:36
1612.06:356:35
1712.06:356:35
1812.06:356:35
1912.06:346:34
2012.06:346:34
2112.06:336:33
2212.06:336:33
2312.06:336:33
2412.06:326:32
2512.06:326:32
2612.06:326:32
2712.06:316:31
2812.06:316:31
2912.06:316:31
3012.06:306:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.16 kWh/m².

For context, solar energy here swings from a low near 5.18 kWh/m² to a high of 6.8 kWh/m² in February across the year — September's 6.16 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.9Bright
55.9Bright
65.9Bright
76.0Bright
86.0Bright
96.0Intense
106.1Intense
116.1Intense
126.1Intense
136.2Intense
146.2Intense
156.2Intense
166.2Intense
176.2Intense
186.3Intense
196.3Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.2Intense
306.2Intense
Planning a trip in September

Is September a good time to visit Kisumu?

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

5.2
Sightseeing
5th-best month of the year
4.9
Beach & pool
7th-best month of the year

September is a reasonable time to visit Kisumu for sightseeing.

What to pack for Kisumu in September

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

In September, Kisumu sees daytime highs around 26°C and nights near 18°C. Pack rain gear and sun protection. Worth having: light clothes. About 20 days see rain.

rain gearsun protectionlight clothes

UV index in Kisumu 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 Kisumu peaks around March 16 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 16UV 16Jun 18UV 10
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar16Extreme
Apr14Extreme
May12Extreme
Jun10Very high
Jul11Extreme
Aug11Extreme
Sep13Extreme
Oct14Extreme
Nov12Extreme
Dec12Extreme

Air quality in Kisumu 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 Kisumu is worst in June — around 78 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyJun 2177 µg/m³Apr 967 µg/m³
PM2.5 (µg/m³)Level
Jan74Unhealthy
Feb68Unhealthy
Mar67Unhealthy
Apr67Unhealthy
May69Unhealthy
Jun78Unhealthy
Jul76Unhealthy
Aug74Unhealthy
Sep71Unhealthy
Oct73Unhealthy
Nov77Unhealthy
Dec76Unhealthy
Location & terrain

Where is Kisumu?

Kisumu sits at 0.1°S, 34.8°E, 1,174 m above sea level, in Kenya. The nearest listed city is Mbale, 21 km away.

Topography around Kisumu

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

Within 3 km, the terrain around Kisumu has only modest variations in elevation — a maximum elevation change of 60 m around an average of 1,152 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 725 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,634 m.

The land around Kisumu is covered by artificial surfaces (42%) and trees (21%) within 3 km, water (26%), trees (23%) and grassland (23%) within 16 km, and trees (34%) and shrubs (27%) within 80 km.

3 km
60 m
16 km
725 m
80 km
1,634 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Mbale 21 km · Khwisero 36 km · Kakamega 43 km · Oyugis 45 km · Muhoroni 49 km · Kapsabet 51 km · Bondo 54 km · Nyamira 55 km

Kenya travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type G
240 V · 50 Hz
Prices
≈ 34% of US
price level, 2025
GDP per capita
$2,363
2025
Happiness
4.7 / 10
World Happiness, 2025
Homicide rate
4.9
per 100k, 2022
Road deaths
28.3
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
High
EF EPI 593
Religion
Christian 86%Muslim 11%other 2%none 2%

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 Kisumu (-0.1022°, 34.7617°, elevation 1,174 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).