Watamu weather in September

In September, Watamu sees average daytime highs of 28°C and overnight lows near 23°C, with 30 mm of rain across 10.9 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 28°C through the month. The sky is clear or mostly clear about 69% of the time in September, and the air most often feels muggy.

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 Watamu's 1st-clearest and 5th-windiest month. For the whole year in context, see Watamu's year-round climate.

Daytime high
28°
9th warmest
Overnight low
23°
3rd coldest
Rainfall
30 mm
10.9 wet days
Daylight
12 hours
6:15 AM – 6:14 PM
Cloud cover
36%
1st clearest
Wind
19 km/h
5th windiest
Solar energy
6.15 kWh/m²
Travel score
6.4
out of 10

Watamu 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 28°C through the month.

A typical September day in Watamu reaches about 28°C in the afternoon and slips back to 23°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, September runs on par with August and about 1°C cooler than October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12823
22823
32823
42823
52823
62823
72823
82823
92823
102823
112823
122823
132823
142823
152823
162823
172823
182823
192823
202823
212823
222823
232823
242823
252823
262824
272824
282824
292824
302824

How September really feels in Watamu

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
0
heat index over the day's high
Days feeling ≤ C
0
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.

Watamu 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 25°142.612.25.5
Feb31° / 25°71.512.15.4
Mar32° / 25°359.9124.3
Apr31° / 26°962211.93.4
May29° / 25°15221.211.84.3
Jun28° / 24°6114.811.85.6
Jul27° / 23°4412.511.86.1
Aug27° / 23°3412.211.96.4
Sep28° / 23°3010.9126.4
Oct29° / 24°6512.612.15.5
Nov30° / 25°6014.912.24.6
Dec31° / 25°4411.412.24.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 69% 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 16%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28218
38317
48416
58416
68515
78515
88515
98515
108515
118515
128515
138515
148416
158416
168416
178416
188317
198317
208317
218416
228416
238416
248317
258317
268317
278317
288317
298317
308317

Chance of precipitation in September

Any precipitation

Watamu gets around 30 mm of rain over 10.9 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 36% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
335
436
536
637
737
837
938
1038
1138
1238
1338
1438
1538
1638
1738
1837
1937
2036
2136
2235
2335
2435
2535
2634
2734
2834
2934
3035

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 50% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)
16931
26832
36733
46634
56535
66436
76238
86139
95941
105842
115644
125545
135347
145248
155050
164951
174753
184654
194555
204456
214357
224258
234159
244060
253862
263763
273664
283565
293466
303268

Wind in September

Winds average 19 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
120light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3017light 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 6:22 AM to 6:08 AM, and sunset from 6:18 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:226:18
211.96:216:17
311.96:216:17
411.96:206:17
511.96:206:17
612.06:196:16
712.06:196:16
812.06:186:16
912.06:186:16
1012.06:186:15
1112.06:176:15
1212.06:176:15
1312.06:166:15
1412.06:166:14
1512.06:156:14
1612.06:156:14
1712.06:146:13
1812.06:146:13
1912.06:136:13
2012.06:136:13
2112.06:126:12
2212.06:126:12
2312.06:126:12
2412.06:116:12
2512.06:116:11
2612.06:106:11
2712.06:106:11
2812.06:096:10
2912.06:096:10
3012.06:086:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.15 kWh/m².

For context, solar energy here swings from a low near 4.88 kWh/m² to a high of 6.58 kWh/m² in February across the year — September's 6.15 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
26.0Bright
36.0Bright
46.0Intense
56.0Intense
66.0Intense
76.0Intense
86.0Intense
96.1Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.1Intense
166.2Intense
176.2Intense
186.2Intense
196.2Intense
206.2Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.3Intense
Planning a trip in September

Hazard calendar for Watamu

In seasonPeak

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

Watamu's rainy season runs April–May, 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 Watamu?

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

6.4
Sightseeing
1st-best month of the year
7.0
Beach & pool
3rd-best month of the year

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

What to pack for Watamu in September

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

In September, Watamu sees daytime highs around 28°C and nights near 23°C. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

Sea temperature near Watamu 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.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb28Warm
Mar29Tropical
Apr29Tropical
May28Warm
Jun27Warm
Jul26Warm
Aug25Warm
Sep26Warm
Oct27Warm
Nov28Warm
Dec28Tropical

UV index in Watamu 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 Watamu 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 19UV 15Jun 18UV 10
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun9Very high
Jul10Extreme
Aug11Extreme
Sep13Extreme
Oct13Extreme
Nov13Extreme
Dec12Extreme

Air quality in Watamu 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 Watamu is worst in January — around 16 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (October, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateGoodModerateJan 1716 µg/m³Oct 209 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb15Moderate
Mar13Moderate
Apr10Good
May11Good
Jun13Moderate
Jul14Moderate
Aug11Good
Sep10Good
Oct9Good
Nov9Good
Dec14Moderate
Location & terrain

Where is Watamu?

Watamu sits at 3.4°S, 40.0°E, 6 m above sea level, in Kenya. The nearest listed city is Malindi, 18 km away.

MtwapaMariakaniJomvuMazerasMombasaMatuga

Topography around Watamu

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

Within 3 km, the terrain around Watamu has only modest variations in elevation — a maximum elevation change of 23 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 152 m; within 80 km, significant variations in elevation — a maximum elevation change of 518 m.

The land around Watamu is covered by water (46%) and trees (28%) within 3 km, water (47%) and trees (32%) within 16 km, and water (36%), shrubs (29%) and trees (21%) within 80 km.

3 km
23 m
16 km
152 m
80 km
518 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwatermangroves
September weather nearby: Malindi 18 km · Kilifi 36 km · Mtwapa 72 km · Mariakani 83 km · Jomvu 84 km · Mazeras 86 km · Mombasa 87 km · Matuga 103 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 Watamu (-3.3533°, 40.0209°, elevation 6 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. 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. 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).