Isiolo weather in December

In December, Isiolo sees average daytime highs of 25°C and overnight lows near 15°C, with 55 mm of rain across 13.3 wet days and about 12 hours of daylight. It is the 9th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 36% of the time in December, and the air most often feels comfortable.

Daylight stretches from about 12 hours at the start of December to 12 hours by month's end. Set against the rest of the year, December is Isiolo's 7th-clearest and 12th-windiest month. For the whole year in context, see Isiolo's year-round climate.

Daytime high
25°
9th warmest
Overnight low
15°
2nd coldest
Rainfall
55 mm
13.3 wet days
Daylight
12 hours
6:26 AM – 6:25 PM
Cloud cover
51%
7th clearest
Wind
6 km/h
12th windiest
Solar energy
5.75 kWh/m²
Travel score
6.6
out of 10

Isiolo is city.

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 25°C through the month.

A typical December day in Isiolo reaches about 25°C in the afternoon and slips back to 15°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 26°C. Set against its neighbours, December runs on par with November and about 1°C cooler than January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12415
22415
32415
42415
52415
62415
72415
82415
92415
102415
112415
122415
132515
142515
152515
162515
172515
182515
192515
202515
212515
222515
232515
242515
252515
262515
272515
282515
292515
302515
312515

Isiolo weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 15°418.2127.3
Feb27° / 15°234.9127.4
Mar27° / 16°438.6126.9
Apr27° / 17°7611.3126.4
May26° / 17°477.5127.2
Jun25° / 16°285.6127.5
Jul24° / 15°387.8127.3
Aug25° / 15°409.1127.1
Sep26° / 16°275.7127.6
Oct26° / 16°5310126.8
Nov24° / 16°9919.8125.5
Dec25° / 15°5513.3126.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 29% of December, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25743
35842
45842
55941
65941
76040
86139
96238
106238
116238
126337
136436
146436
156535
166535
176535
186634
196733
206733
216733
226733
236832
246832
256931
266931
276931
286931
296931
306931
316931

Chance of precipitation in December

Any precipitation

Isiolo gets around 55 mm of rain over 13.3 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 60% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
160
259
358
457
556
654
753
852
950
1049
1147
1246
1345
1443
1542
1641
1740
1839
1938
2037
2136
2236
2335
2434
2534
2633
2733
2833
2932
3032
3131

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the comfortable band about 62% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
1117118
2117118
3127117
4147016
5157015
6166915
7186814
8196813
9216712
10226612
11246511
12256510
1326659
1428639
1529638
1630628
1731627
1832617
1933607
2033607
2134606
2235596
2336586
2437576
2538575
2640555
2741545
2842535
2943525
3044515
3145505

Wind in December

Winds average 6 km/h in December, the calmest month.

Across December, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
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
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

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

Days grow by about 0 minutes over December. Sunrise moves from 6:20 AM to 6:33 AM, and sunset from 6:19 PM to 6:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:206:19
212.06:206:19
312.06:216:20
412.06:216:20
512.06:226:20
612.06:226:21
712.06:226:21
812.06:236:22
912.06:236:22
1012.06:246:23
1112.06:246:23
1212.06:256:23
1312.06:256:24
1412.06:266:24
1512.06:266:25
1612.06:266:25
1712.06:276:26
1812.06:276:26
1912.06:286:27
2012.06:286:27
2112.06:296:28
2212.06:296:28
2312.06:306:28
2412.06:306:29
2512.06:316:29
2612.06:316:30
2712.06:326:30
2812.06:326:31
2912.06:336:31
3012.06:336:32
3112.06:336:32

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.75 kWh/m².

For context, solar energy here swings from a low near 5.36 kWh/m² to a high of 6.82 kWh/m² in February across the year — December's 5.75 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.6Bright
95.6Bright
105.6Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.9Bright
205.9Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
256.0Bright
266.0Bright
276.0Bright
286.0Intense
296.0Intense
306.0Intense
316.0Intense
Planning a trip in December

Is December a good time to visit Isiolo?

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

6.6
Sightseeing
10th-best month of the year
5.8
Beach & pool
11th-best month of the year

December is a reasonable time to visit Isiolo for sightseeing.

What to pack for Isiolo in December

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

In December, Isiolo sees daytime highs around 25°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

UV index in Isiolo 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 Isiolo peaks around March 17 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 16Jun 19UV 11
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar16Extreme
Apr15Extreme
May12Extreme
Jun10Extreme
Jul11Extreme
Aug12Extreme
Sep13Extreme
Oct14Extreme
Nov13Extreme
Dec12Extreme

Air quality in Isiolo 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 Isiolo is worst in February — around 32 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (September, 19 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateFeb 1832 µg/m³Sep 1819 µg/m³
PM2.5 (µg/m³)Level
Jan30Moderate
Feb32Moderate
Mar31Moderate
Apr28Moderate
May25Moderate
Jun28Moderate
Jul27Moderate
Aug21Moderate
Sep19Moderate
Oct20Moderate
Nov29Moderate
Dec32Moderate
Location & terrain

Where is Isiolo?

Isiolo sits at 0.4°N, 37.6°E, 1,095 m above sea level, in Kenya. The nearest listed city is Meru, 35 km away.

NanyukiChukaEmbuKerugoyaGarba TulaKaratina

Topography around Isiolo

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

Within 3 km, the terrain around Isiolo has only modest variations in elevation — a maximum elevation change of 146 m around an average of 1,107 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 833 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,636 m.

The land around Isiolo is covered by grassland (39%), artificial surfaces (25%) and shrubs (24%) within 3 km, grassland (42%) and shrubs (39%) within 16 km, and shrubs (40%) and grassland (36%) within 80 km.

3 km
146 m
16 km
833 m
80 km
4,636 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Meru 35 km · Maua 42 km · Nanyuki 69 km · Chuka 77 km · Embu 100 km · Kerugoya 101 km · Garba Tula 106 km · Karatina 106 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 Isiolo (0.3546°, 37.5822°, elevation 1,095 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).