Mombasa weather in September

In September, Mombasa sees average daytime highs of 27°C and overnight lows near 23°C, with 43 mm of rain across 14.8 wet days and about 12 hours of daylight. It is the 9th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 62% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Mombasa's 1st-clearest and 5th-windiest month. For the whole year in context, see Mombasa's year-round climate.

Daytime high: 27°; 9th warmest
Overnight low: 23°; 3rd coldest
Rainfall: 43 mm; 14.8 wet days
Daylight: 12 hours; 6:16 AM – 6:15 PM
Cloud cover: 38%; 1st clearest
Wind: 18 km/h; 5th windiest
Solar energy: 6.06 kWh/m²
Travel score: 6.1; out of 10

Mombasa is city in Kenya.

Air quality: Moderate; PM2.5 10.8 µg/m³ · 2019
Density: 4,100/km²; people per km²
Founded: 1593

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

← August Mombasa year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical September day in Mombasa reaches about 27°C in the afternoon and slips back to 23°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 28°C. Set against its neighbours, September runs on par with August and about 1°C cooler than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	28	28	28	28	28	28	28	28	28
Avg low (°C)	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	24	24	24	24	24	24

	Avg high (°C)	Avg low (°C)
1	27	23
2	27	23
3	27	23
4	27	23
5	27	23
6	27	23
7	27	23
8	27	23
9	27	23
10	27	23
11	27	23
12	27	23
13	27	23
14	27	23
15	27	23
16	27	23
17	27	23
18	27	23
19	27	23
20	27	23
21	27	23
22	28	23
23	28	23
24	28	23
25	28	24
26	28	24
27	28	24
28	28	24
29	28	24
30	28	24

How September really feels in Mombasa

Once humidity and wind are folded in, September averages 0 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Mombasa weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	30° / 26°	18	3.5	12.2	5.6
Feb	31° / 26°	11	2.4	12.1	5.5
Mar	31° / 26°	49	12.4	12	4.4
Apr	30° / 26°	136	24.4	11.9	3.5
May	28° / 25°	223	24.1	11.8	4.3
Jun	27° / 24°	92	20.5	11.8	5.0
Jul	26° / 23°	69	19.8	11.8	5.2
Aug	27° / 23°	49	17.2	11.9	5.7
Sep	27° / 23°	43	14.8	12	6.1
Oct	28° / 24°	75	14.9	12.1	5.5
Nov	29° / 25°	66	16.1	12.2	4.8
Dec	30° / 25°	46	13	12.2	4.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 16%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	81	83	83	83	85	85	85	85	86	86	86	86	85	85	85	84	84	84	83	84	84	83	83	83	83	82	82	81	81	81
Cloudier (%)	19	17	17	17	15	15	15	15	14	14	14	14	15	15	15	16	16	16	17	16	16	17	17	17	17	18	18	19	19	19

	Clearer (%)	Cloudier (%)
1	81	19
2	83	17
3	83	17
4	83	17
5	85	15
6	85	15
7	85	15
8	85	15
9	86	14
10	86	14
11	86	14
12	86	14
13	85	15
14	85	15
15	85	15
16	84	16
17	84	16
18	84	16
19	83	17
20	84	16
21	84	16
22	83	17
23	83	17
24	83	17
25	83	17
26	82	18
27	82	18
28	81	19
29	81	19
30	81	19

Chance of precipitation in September

Any precipitation

Mombasa gets around 43 mm of rain over 14.8 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 49% and peaks near 53% on the wettest days. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	53	53	53	53	53	53	53	53	52	52	51	51	50	50	49	49	48	48	47	46	46	45	45	45	45	45	45	45	45	46

	Rain chance (%)
1	53
2	53
3	53
4	53
5	53
6	53
7	53
8	53
9	52
10	52
11	51
12	51
13	50
14	50
15	49
16	49
17	48
18	48
19	47
20	46
21	46
22	45
23	45
24	45
25	45
26	45
27	45
28	45
29	45
30	46

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Muggy (%)	66	65	64	63	62	60	59	57	56	55	54	53	51	50	49	48	47	46	45	44	43	43	42	41	40	39	38	37	36	35
Oppressive (%)	34	35	36	37	38	40	41	43	44	45	46	47	49	50	51	52	53	54	55	56	57	57	58	59	60	61	62	63	64	65

	Muggy (%)	Oppressive (%)
1	66	34
2	65	35
3	64	36
4	63	37
5	62	38
6	60	40
7	59	41
8	57	43
9	56	44
10	55	45
11	54	46
12	53	47
13	51	49
14	50	50
15	49	51
16	48	52
17	47	53
18	46	54
19	45	55
20	44	56
21	43	57
22	43	57
23	42	58
24	41	59
25	40	60
26	39	61
27	38	62
28	37	63
29	36	64
30	35	65

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	19	19	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	17	17	17	17	17	17	17	17	17	17	17	17
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	19	light breeze
2	19	light breeze
3	18	light breeze
4	18	light breeze
5	18	light breeze
6	18	light breeze
7	18	light breeze
8	18	light breeze
9	18	light breeze
10	18	light breeze
11	18	light breeze
12	18	light breeze
13	18	light breeze
14	18	light breeze
15	18	light breeze
16	18	light breeze
17	18	light breeze
18	18	light breeze
19	17	light breeze
20	17	light breeze
21	17	light breeze
22	17	light breeze
23	17	light breeze
24	17	light breeze
25	17	light breeze
26	17	light breeze
27	17	light breeze
28	17	light breeze
29	17	light breeze
30	17	light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min 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 6 minutes over September. Sunrise moves from 6:23 AM to 6:10 AM, and sunset from 6:19 PM to 6:12 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	6:23	6:23	6:23	6:22	6:22	6:21	6:21	6:20	6:20	6:19	6:19	6:18	6:18	6:17	6:17	6:16	6:16	6:15	6:15	6:14	6:14	6:13	6:13	6:12	6:12	6:12	6:11	6:11	6:10	6:10
Sunset (PM)	6:19	6:18	6:18	6:18	6:18	6:18	6:17	6:17	6:17	6:17	6:16	6:16	6:16	6:16	6:15	6:15	6:15	6:14	6:14	6:14	6:14	6:13	6:13	6:13	6:13	6:13	6:12	6:12	6:12	6:12

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.9	6:23	6:19
2	11.9	6:23	6:18
3	11.9	6:23	6:18
4	11.9	6:22	6:18
5	11.9	6:22	6:18
6	11.9	6:21	6:18
7	11.9	6:21	6:17
8	11.9	6:20	6:17
9	12.0	6:20	6:17
10	12.0	6:19	6:17
11	12.0	6:19	6:16
12	12.0	6:18	6:16
13	12.0	6:18	6:16
14	12.0	6:17	6:16
15	12.0	6:17	6:15
16	12.0	6:16	6:15
17	12.0	6:16	6:15
18	12.0	6:15	6:14
19	12.0	6:15	6:14
20	12.0	6:14	6:14
21	12.0	6:14	6:14
22	12.0	6:13	6:13
23	12.0	6:13	6:13
24	12.0	6:12	6:13
25	12.0	6:12	6:13
26	12.0	6:12	6:13
27	12.0	6:11	6:12
28	12.0	6:11	6:12
29	12.0	6:10	6:12
30	12.0	6:10	6:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.06 kWh/m².

For context, solar energy here swings from a low near 4.67 kWh/m² to a high of 6.64 kWh/m² in February across the year — September's 6.06 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	5.8	5.9	5.9	5.9	5.9	5.9	5.9	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.1	6.1	6.1	6.1	6.1	6.1	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense

	Solar energy (kWh/m²)	Level
1	5.8	Bright
2	5.9	Bright
3	5.9	Bright
4	5.9	Bright
5	5.9	Bright
6	5.9	Bright
7	5.9	Bright
8	6.0	Bright
9	6.0	Bright
10	6.0	Bright
11	6.0	Bright
12	6.0	Intense
13	6.0	Intense
14	6.0	Intense
15	6.0	Intense
16	6.0	Intense
17	6.1	Intense
18	6.1	Intense
19	6.1	Intense
20	6.1	Intense
21	6.1	Intense
22	6.1	Intense
23	6.2	Intense
24	6.2	Intense
25	6.2	Intense
26	6.2	Intense
27	6.2	Intense
28	6.2	Intense
29	6.2	Intense
30	6.2	Intense

Planning a trip in September

Hazard calendar for Mombasa

In seasonPeak

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

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

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

Cyclone

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Mombasa?

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

6.1

Sightseeing

1st-best month of the year

6.2

Beach & pool

6th-best month of the year

September is a reasonable time to visit Mombasa for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Mombasa in September

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

In September, Mombasa sees daytime highs around 27°C and nights near 23°C. Pack light clothes, rain gear and sun protection. About 15 days see rain.

light clothesrain gearsun protection

Sea temperature near Mombasa in September

The nearest coast averages about 26°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in April at about 29°C and coldest in August near 25°C.

The water stays above 20°C all year — warm enough for a swim any month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	28	28	29	29	28	27	26	25	26	27	28	28
Comfort	Warm	Warm	Tropical	Tropical	Warm	Warm	Warm	Warm	Warm	Warm	Warm	Tropical

	Sea temperature (°C)	Comfort
Jan	28	Warm
Feb	28	Warm
Mar	29	Tropical
Apr	29	Tropical
May	28	Warm
Jun	27	Warm
Jul	26	Warm
Aug	25	Warm
Sep	26	Warm
Oct	27	Warm
Nov	28	Warm
Dec	28	Tropical

UV index in Mombasa 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 Mombasa peaks around March 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 10 (very high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	14	14	15	14	11	9	10	11	13	13	12	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	14	Extreme
Mar	15	Extreme
Apr	14	Extreme
May	11	Extreme
Jun	9	Very high
Jul	10	Extreme
Aug	11	Extreme
Sep	13	Extreme
Oct	13	Extreme
Nov	12	Extreme
Dec	12	Extreme

Location & terrain

Where is Mombasa?

Mombasa sits at 4.1°S, 39.7°E, 20 m above sea level, in Kenya. The nearest listed city is Jomvu, 10 km away.

Topography around Mombasa

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

Within 3 km, the terrain around Mombasa has only modest variations in elevation — a maximum elevation change of 31 m around an average of 12 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 264 m; within 80 km, large variations in elevation — a maximum elevation change of 800 m.

The land around Mombasa is covered by artificial surfaces (46%) and water (35%) within 3 km, water (41%) and grassland (21%) within 16 km, and water (36%), grassland (24%) and shrubs (23%) within 80 km.

3 km

31 m

artificial surfaces 46%

16 km

264 m

water 41%

80 km

800 m

water 36%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves

← August Mombasa year-round climate October →Best places to visit in September

September weather nearby: Jomvu 10 km · Mtwapa 16 km · Mazeras 16 km · Matuga 16 km · Diani Beach 26 km · Ukunda 29 km · Mariakani 30 km · Kilifi 51 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

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 Mombasa (-4.0547°, 39.6636°, elevation 20 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). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	27	23
2	27	23
3	27	23
4	27	23
5	27	23
6	27	23
7	27	23
8	27	23
9	27	23
10	27	23
11	27	23
12	27	23
13	27	23
14	27	23
15	27	23
16	27	23
17	27	23
18	27	23
19	27	23
20	27	23
21	27	23
22	28	23
23	28	23
24	28	23
25	28	24
26	28	24
27	28	24
28	28	24
29	28	24
30	28	24

	Clearer (%)	Cloudier (%)
1	81	19
2	83	17
3	83	17
4	83	17
5	85	15
6	85	15
7	85	15
8	85	15
9	86	14
10	86	14
11	86	14
12	86	14
13	85	15
14	85	15
15	85	15
16	84	16
17	84	16
18	84	16
19	83	17
20	84	16
21	84	16
22	83	17
23	83	17
24	83	17
25	83	17
26	82	18
27	82	18
28	81	19
29	81	19
30	81	19

	Rain chance (%)
1	53
2	53
3	53
4	53
5	53
6	53
7	53
8	53
9	52
10	52
11	51
12	51
13	50
14	50
15	49
16	49
17	48
18	48
19	47
20	46
21	46
22	45
23	45
24	45
25	45
26	45
27	45
28	45
29	45
30	46

	Muggy (%)	Oppressive (%)
1	66	34
2	65	35
3	64	36
4	63	37
5	62	38
6	60	40
7	59	41
8	57	43
9	56	44
10	55	45
11	54	46
12	53	47
13	51	49
14	50	50
15	49	51
16	48	52
17	47	53
18	46	54
19	45	55
20	44	56
21	43	57
22	43	57
23	42	58
24	41	59
25	40	60
26	39	61
27	38	62
28	37	63
29	36	64
30	35	65

	Avg high (°C)	Avg low (°C)
1	27	23
2	27	23
3	27	23
4	27	23
5	27	23
6	27	23
7	27	23
8	27	23
9	27	23
10	27	23
11	27	23
12	27	23
13	27	23
14	27	23
15	27	23
16	27	23
17	27	23
18	27	23
19	27	23
20	27	23
21	27	23
22	28	23
23	28	23
24	28	23
25	28	24
26	28	24
27	28	24
28	28	24
29	28	24
30	28	24

	Clearer (%)	Cloudier (%)
1	81	19
2	83	17
3	83	17
4	83	17
5	85	15
6	85	15
7	85	15
8	85	15
9	86	14
10	86	14
11	86	14
12	86	14
13	85	15
14	85	15
15	85	15
16	84	16
17	84	16
18	84	16
19	83	17
20	84	16
21	84	16
22	83	17
23	83	17
24	83	17
25	83	17
26	82	18
27	82	18
28	81	19
29	81	19
30	81	19

	Rain chance (%)
1	53
2	53
3	53
4	53
5	53
6	53
7	53
8	53
9	52
10	52
11	51
12	51
13	50
14	50
15	49
16	49
17	48
18	48
19	47
20	46
21	46
22	45
23	45
24	45
25	45
26	45
27	45
28	45
29	45
30	46

	Muggy (%)	Oppressive (%)
1	66	34
2	65	35
3	64	36
4	63	37
5	62	38
6	60	40
7	59	41
8	57	43
9	56	44
10	55	45
11	54	46
12	53	47
13	51	49
14	50	50
15	49	51
16	48	52
17	47	53
18	46	54
19	45	55
20	44	56
21	43	57
22	43	57
23	42	58
24	41	59
25	40	60
26	39	61
27	38	62
28	37	63
29	36	64
30	35	65

	Avg high (°C)	Avg low (°C)
1	27	23
2	27	23
3	27	23
4	27	23
5	27	23
6	27	23
7	27	23
8	27	23
9	27	23
10	27	23
11	27	23
12	27	23
13	27	23
14	27	23
15	27	23
16	27	23
17	27	23
18	27	23
19	27	23
20	27	23
21	27	23
22	28	23
23	28	23
24	28	23
25	28	24
26	28	24
27	28	24
28	28	24
29	28	24
30	28	24

	Clearer (%)	Cloudier (%)
1	81	19
2	83	17
3	83	17
4	83	17
5	85	15
6	85	15
7	85	15
8	85	15
9	86	14
10	86	14
11	86	14
12	86	14
13	85	15
14	85	15
15	85	15
16	84	16
17	84	16
18	84	16
19	83	17
20	84	16
21	84	16
22	83	17
23	83	17
24	83	17
25	83	17
26	82	18
27	82	18
28	81	19
29	81	19
30	81	19

	Rain chance (%)
1	53
2	53
3	53
4	53
5	53
6	53
7	53
8	53
9	52
10	52
11	51
12	51
13	50
14	50
15	49
16	49
17	48
18	48
19	47
20	46
21	46
22	45
23	45
24	45
25	45
26	45
27	45
28	45
29	45
30	46

	Muggy (%)	Oppressive (%)
1	66	34
2	65	35
3	64	36
4	63	37
5	62	38
6	60	40
7	59	41
8	57	43
9	56	44
10	55	45
11	54	46
12	53	47
13	51	49
14	50	50
15	49	51
16	48	52
17	47	53
18	46	54
19	45	55
20	44	56
21	43	57
22	43	57
23	42	58
24	41	59
25	40	60
26	39	61
27	38	62
28	37	63
29	36	64
30	35	65