Diani Beach weather in December

In December, Diani Beach sees average daytime highs of 31°C and overnight lows near 25°C, with 58 mm of rain across 13.7 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 48% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of December to 12 h 12 min by month's end. Set against the rest of the year, December is Diani Beach's 3rd-clearest and 10th-windiest month. For the whole year in context, see Diani Beach's year-round climate.

Daytime high
31°
4th warmest
Overnight low
25°
8th coldest
Rainfall
58 mm
13.7 wet days
Daylight
12 h 12 min
6:10 AM – 6:25 PM
Cloud cover
47%
3rd clearest
Wind
10 km/h
10th windiest
Solar energy
6.12 kWh/m²
Travel score
4.2
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical December day in Diani Beach reaches about 31°C in the afternoon and slips back to 25°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 32°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13124
23124
33124
43124
53124
63124
73124
83125
93125
103125
113125
123125
133125
143125
153125
163125
173125
183125
193125
203125
213125
223225
233225
243225
253225
263225
273225
283225
293225
303225
313225

How December really feels in Diani Beach

Once humidity and wind are folded in, December averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Diani Beach weather by month

How December compares with the rest of the year at a glance. December is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 25°234.312.24.6
Feb32° / 25°173.812.14.4
Mar32° / 25°5614.3123.7
Apr30° / 25°13624.111.93.3
May28° / 24°21223.211.84.1
Jun27° / 23°9220.511.84.9
Jul27° / 22°722011.85.2
Aug27° / 22°6119.611.95.3
Sep28° / 22°5417.6125.5
Oct29° / 23°9017.412.14.9
Nov30° / 24°7817.312.24.3
Dec31° / 25°5813.712.24.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 48% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 24% of December, with mostly cloudy or overcast conditions the remaining 29%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16832
26931
36931
46931
57030
66931
77030
87030
97129
107129
117129
127129
137228
147228
157228
167327
177228
187228
197327
207228
217228
227228
237327
247327
257327
267327
277327
287327
297228
307228
317129

Chance of precipitation in December

Any precipitation

Diani Beach gets around 58 mm of rain over 13.7 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 43% and peaks near 57% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
157
257
356
456
555
655
754
853
952
1051
1149
1248
1347
1446
1545
1644
1742
1841
1940
2039
2138
2237
2336
2434
2533
2631
2730
2828
2926
3025
3124

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 80% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
107822
207921
307921
407921
507921
607921
707921
807921
907921
1007822
1107822
1207822
1307822
1407822
1507822
1607822
1707822
1807822
1917821
2017821
2117920
2218019
2318118
2418118
2528117
2628216
2728216
2828315
2928414
3038413
3138512

Wind in December

Winds average 10 km/h in December.

Across December, daily wind ranges from about 9 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2312calm
2412calm
2512calm
2612calm
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3113light breeze

Sunrise & sunset in December

DaylightNight

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

Days grow by about 0 minutes over December. Sunrise moves from 6:04 AM to 6:17 AM, and sunset from 6:18 PM to 6:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:046:18
212.26:056:19
312.26:056:19
412.26:056:20
512.26:066:20
612.26:066:20
712.26:076:21
812.26:076:21
912.26:076:22
1012.26:086:22
1112.26:086:23
1212.26:096:23
1312.26:096:24
1412.26:106:24
1512.26:106:25
1612.26:106:25
1712.26:116:26
1812.26:116:26
1912.26:126:27
2012.26:126:27
2112.26:136:28
2212.26:136:28
2312.26:146:28
2412.26:146:29
2512.26:156:29
2612.26:156:30
2712.26:166:30
2812.26:166:31
2912.26:166:31
3012.26:176:32
3112.26:176:32

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.12 kWh/m².

For context, solar energy here swings from a low near 4.63 kWh/m² to a high of 6.56 kWh/m² in February across the year — December's 6.12 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.1Intense
46.1Intense
56.1Intense
66.1Intense
76.1Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.1Intense
166.1Intense
176.1Intense
186.1Intense
196.1Intense
206.1Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.2Intense
266.2Intense
276.2Intense
286.2Intense
296.2Intense
306.2Intense
316.2Intense
Planning a trip in December

Hazard calendar for Diani Beach

In seasonPeak

In December, Diani Beach sits inside its cyclone season. The full year is below, with each hazard's peak months called out.

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

Diani Beach'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 December a good time to visit Diani Beach?

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

4.2
Sightseeing
9th-best month of the year
6.3
Beach & pool
3rd-best month of the year

December is a reasonable time to visit Diani Beach for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Diani Beach in December

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

In December, Diani Beach sees daytime highs around 31°C and nights near 25°C. Pack light clothes and sun protection. Worth having: rain gear. About 14 days see rain.

light clothessun protectionrain gear

Sea temperature near Diani Beach in December

The nearest coast averages about 28°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in March 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
Jan28Warm
Feb28Tropical
Mar29Tropical
Apr29Tropical
May28Warm
Jun27Warm
Jul26Warm
Aug25Warm
Sep26Warm
Oct27Warm
Nov28Warm
Dec28Tropical

UV index in Diani Beach in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Diani Beach peaks around March 18 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 18UV 15Jun 18UV 10
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun9Very high
Jul10Extreme
Aug11Extreme
Sep13Extreme
Oct13Extreme
Nov13Extreme
Dec12Extreme

Air quality in Diani Beach in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Diani Beach is worst in January — around 22 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJan 1422 µg/m³Oct 1313 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb20Moderate
Mar16Moderate
Apr13Moderate
May14Moderate
Jun16Moderate
Jul16Moderate
Aug15Moderate
Sep13Moderate
Oct12Moderate
Nov15Moderate
Dec21Moderate
Location & terrain

Where is Diani Beach?

Diani Beach sits at 4.3°S, 39.6°E, 0 m above sea level, in Kenya. The nearest listed city is Ukunda, 4.0 km away.

Kilifi

Topography around Diani Beach

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

Within 3 km, the terrain around Diani Beach has only modest variations in elevation — a maximum elevation change of 30 m around an average of 7 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 336 m; within 80 km, large variations in elevation — a maximum elevation change of 800 m.

The land around Diani Beach is covered by water (53%) and trees (30%) within 3 km, water (51%) and trees (28%) within 16 km, and water (43%) and grassland (22%) within 80 km.

3 km
30 m
16 km
336 m
80 km
800 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwatermangroves
December weather nearby: Ukunda 4.0 km · Matuga 13 km · Mombasa 26 km · Jomvu 33 km · Mazeras 35 km · Mtwapa 42 km · Mariakani 48 km · Kilifi 78 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 Diani Beach (-4.2798°, 39.5947°, elevation 0 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. 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).