Isaka weather in December

In December, Isaka sees average daytime highs of 28°C and overnight lows near 19°C, with 130 mm of rain across 18.5 wet days and about 12.2 hours of daylight. It is the 11th-warmest and 1st-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 18% of the time in December, and the air most often feels humid.

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 Isaka's 11th-clearest and 12th-windiest month. For the whole year in context, see Isaka's year-round climate.

Daytime high
28°
11th warmest
Overnight low
19°
5th coldest
Rainfall
130 mm
18.5 wet days
Daylight
12 h 12 min
6:38 AM – 6:51 PM
Cloud cover
68%
11th clearest
Wind
6 km/h
12th windiest
Solar energy
5.76 kWh/m²
Travel score
4.8
out of 10

Isaka is settlement in Shinyanga Region, Tanzania.

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 28°C through the month.

A typical December day in Isaka reaches about 28°C in the afternoon and slips back to 19°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 31°C. Set against its neighbours, December runs about 2°C cooler than November and on par with January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12919
22919
32919
42919
52819
62819
72819
82819
92819
102819
112819
122819
132819
142819
152819
162819
172819
182819
192819
202819
212819
222819
232819
242819
252819
262819
272819
282819
292819
302819
312819

How December really feels in Isaka

Once humidity and wind are folded in, December 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

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

Isaka weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°11918.112.24.9
Feb29° / 19°9314.512.14.7
Mar29° / 19°11816.4124.7
Apr28° / 19°9813.511.95.2
May29° / 19°203.911.86.2
Jun29° / 19°20.411.86.5
Jul29° / 18°00.111.86.9
Aug30° / 19°30.611.96.1
Sep32° / 20°71.3125.2
Oct32° / 20°275.112.14.5
Nov30° / 20°10313.312.24.5
Dec28° / 19°13018.512.24.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 19% of December, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14060
24060
33961
43862
53862
63862
73862
83763
93763
103763
113763
123664
133565
143565
153565
163565
173565
183565
193565
203565
213664
223664
233763
243763
253763
263763
273763
283763
293862
303862
313862

Chance of precipitation in December

Any precipitation

Isaka gets around 130 mm of rain over 18.5 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 60% and peaks near 62% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
155
255
356
456
556
657
757
858
958
1059
1160
1260
1361
1461
1561
1662
1762
1862
1962
2062
2161
2261
2361
2461
2561
2661
2761
2861
2961
3061
3161

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the humid band about 55% of days. Sticky, muggy-or-worse air turns up on roughly 29% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
16175423
26175423
35175424
45165524
55165425
65165425
75155426
84155526
94145626
104135726
114135627
124125727
134125727
144115728
154115728
164115629
174105729
184105630
194105630
204105531
213105631
22395632
23395632
24395533
25395434
26395434
27395335
28395335
29395236
30395137
31385237

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 6 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
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

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 6:32 AM to 6:45 AM, and sunset from 6:44 PM to 6:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:326:44
212.26:326:45
312.26:326:45
412.26:336:46
512.26:336:46
612.26:346:46
712.26:346:47
812.26:346:47
912.26:356:48
1012.26:356:48
1112.26:366:49
1212.26:366:49
1312.26:366:50
1412.26:376:50
1512.26:376:51
1612.26:386:51
1712.26:386:52
1812.26:396:52
1912.26:396:53
2012.26:406:53
2112.26:406:54
2212.26:406:54
2312.26:416:54
2412.26:416:55
2512.26:426:55
2612.26:426:56
2712.26:436:56
2812.26:436:57
2912.26:446:57
3012.26:446:58
3112.26:456:58

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.76 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 5.76 kWh/m² to a high of 6.92 kWh/m² in September across the year — December's 5.76 kWh/m² sits near the bottom.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in December

Hazard calendar for Isaka

In seasonPeak

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

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

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

Is December a good time to visit Isaka?

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

4.8
Sightseeing
8th-best month of the year
5.5
Beach & pool
12th-best month of the year

December is a reasonable time to visit Isaka for sightseeing.

What to pack for Isaka in December

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

In December, Isaka sees daytime highs around 28°C and nights near 19°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

UV index in Isaka in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December 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 Isaka peaks around March 10 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 10UV 16Jun 17UV 10
UV index (midday)Level
Jan13Extreme
Feb16Extreme
Mar16Extreme
Apr15Extreme
May12Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep13Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme

Air quality in Isaka 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 Isaka is worst in January — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (May, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJan 1917 µg/m³May 218 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb15Moderate
Mar12Moderate
Apr10Good
May8Good
Jun8Good
Jul10Good
Aug11Good
Sep11Good
Oct10Good
Nov11Good
Dec13Moderate
Location & terrain

Where is Isaka?

Isaka sits at 3.9°S, 32.9°E, 1,201 m above sea level, in Tanzania. The nearest listed city is Tinde, 30 km away.

MhangoSongwaMwadui

Topography around Isaka

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

Within 3 km, the terrain around Isaka has only modest variations in elevation — a maximum elevation change of 34 m around an average of 1,187 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 228 m; within 80 km, significant variations in elevation — a maximum elevation change of 502 m.

The land around Isaka is covered by cropland (85%) within 3 km, cropland (86%) within 16 km, and cropland (75%) within 80 km.

3 km
34 m
16 km
228 m
80 km
502 m
treesshrubsgrasslandcroplandartificial surfaces
December weather nearby: Tinde 30 km · Kahama 38 km · Nzega 45 km · Shinyanga 60 km · Old Shinyanga 65 km · Mhango 69 km · Songwa 78 km · Mwadui 84 km

Tanzania travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type D / G
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$1,319
2025
Happiness
3.9 / 10
World Happiness, 2025
Safe drinking water
31%
of population, 2024
Homicide rate
3.7
per 100k, 2020
Road deaths
31.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Low
EF EPI 479
Religion
Christian 63%Muslim 34%folk religion 1%

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 Isaka (-3.9°, 32.9333°, elevation 1,201 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).