Kasulu weather in December

In December, Kasulu sees average daytime highs of 25°C and overnight lows near 17°C, with 257 mm of rain across 28.9 wet days and about 12.3 hours of daylight. It is the 12th-warmest and 1st-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 2% 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 18 min by month's end. Set against the rest of the year, December is Kasulu's 11th-clearest and 12th-windiest month. For the whole year in context, see Kasulu's year-round climate.

Daytime high
25°
12th warmest
Overnight low
17°
5th coldest
Rainfall
257 mm
28.9 wet days
Daylight
12 h 18 min
6:48 AM – 7:04 PM
Cloud cover
85%
11th clearest
Wind
4 km/h
12th windiest
Solar energy
4.94 kWh/m²
Travel score
3.8
out of 10

Kasulu is city in Kigoma, Tanzania.

Density
271/km²
people per km²
Founded
1500

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 Kasulu reaches about 25°C in the afternoon and slips back to 17°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 27°C. Set against its neighbours, December runs on par with November and on par with January.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12517
22517
32517
42517
52517
62517
72517
82517
92517
102517
112517
122517
132517
142517
152517
162517
172517
182517
192517
202517
212517
222517
232517
242517
252517
262517
272517
282517
292517
302517
312517

Kasulu weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 17°23528.312.23.8
Feb26° / 17°18924.312.14.0
Mar26° / 17°21427.3124.0
Apr25° / 17°17223.711.94.3
May26° / 17°6811.111.86.4
Jun27° / 16°14311.77.6
Jul27° / 16°30.811.87.9
Aug29° / 17°111.811.96.8
Sep29° / 18°366.4125.7
Oct28° / 18°1361712.14.9
Nov26° / 17°23125.512.24.0
Dec25° / 17°25728.912.33.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 8% of December, with mostly cloudy or overcast conditions the remaining 91%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1793
2793
3793
4793
5793
6892
7892
8892
9892
10892
11892
12892
13991
141090
151090
161090
171090
181090
191090
201090
211090
221090
231090
241090
251189
261189
271189
281189
291288
301288
311288

Chance of precipitation in December

Any precipitation

Kasulu gets around 257 mm of rain over 28.9 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 93% and peaks near 94% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
191
292
392
492
592
692
793
893
993
1093
1193
1293
1393
1493
1593
1693
1793
1893
1993
2093
2193
2294
2394
2494
2594
2694
2793
2893
2993
3093
3193

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 85% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)
128810
218811
318811
418811
518811
618811
718811
818712
918712
1018712
1118712
1218712
1318712
1418613
1518613
1618613
1708713
1808713
1908614
2008614
2108515
2208515
2308416
2408416
2508317
2608317
2708218
2808218
2908218
3008119
3108119

Wind in December

Winds average 4 km/h in December, the calmest month.

Across December, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 12 min at the start of December to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 6:42 AM to 6:55 AM, and sunset from 6:57 PM to 7:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:426:57
212.26:426:57
312.26:436:58
412.36:436:58
512.36:436:58
612.36:446:59
712.36:446:59
812.36:447:00
912.36:457:00
1012.36:457:01
1112.36:467:01
1212.36:467:02
1312.36:477:02
1412.36:477:03
1512.36:477:03
1612.36:487:04
1712.36:487:04
1812.36:497:05
1912.36:497:05
2012.36:507:06
2112.36:507:06
2212.36:517:07
2312.36:517:07
2412.36:527:07
2512.36:527:08
2612.36:537:08
2712.36:537:09
2812.36:537:09
2912.36:547:10
3012.36:547:10
3112.36:557:11

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.94 kWh/m².

For context, solar energy here swings from a low near 4.9 kWh/m² to a high of 6.25 kWh/m² in September across the year — December's 4.94 kWh/m² sits near the bottom.

0246151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.1Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
315.1Bright
Planning a trip in December

Hazard calendar for Kasulu

In seasonPeak

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

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

Kasulu's rainy season runs October–April, 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 Kasulu?

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

3.8
Sightseeing
11th-best month of the year
3.4
Beach & pool
12th-best month of the year

December is a weaker month for outdoor sightseeing in Kasulu.

What to pack for Kasulu in December

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

In December, Kasulu sees daytime highs around 25°C and nights near 17°C. Pack rain gear. Worth having: light clothes and sun protection. About 29 days see rain.

rain gearlight clothessun protection

UV index in Kasulu 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 Kasulu peaks around March 14 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 14 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 14UV 16Aug 14UV 8
UV index (midday)Level
Jan10Extreme
Feb15Extreme
Mar16Extreme
Apr15Extreme
May12Extreme
Jun10Very high
Jul11Extreme
Aug8Very high
Sep13Extreme
Oct14Extreme
Nov13Extreme
Dec12Extreme

Air quality in Kasulu 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 Kasulu is worst in July — around 47 µg/m³ PM2.5 (poor), about 3.3× the cleanest month (April, 14 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateJul 2146 µg/m³Apr 1515 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb20Moderate
Mar17Moderate
Apr14Moderate
May18Moderate
Jun35Moderate
Jul47Poor
Aug43Poor
Sep36Poor
Oct23Moderate
Nov17Moderate
Dec16Moderate
Location & terrain

Where is Kasulu?

Kasulu sits at 4.6°S, 30.1°E, 1,310 m above sea level, in Tanzania. The nearest listed city is Mwandiga, 57 km away.

VyandaRumongeNgurukaGitegaKibondo

Topography around Kasulu

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

Within 3 km, the terrain around Kasulu has significant variations in elevation — a maximum elevation change of 288 m around an average of 1,320 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 629 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,720 m.

The land around Kasulu is covered by artificial surfaces (29%), cropland (27%) and trees (21%) within 3 km, grassland (49%) and cropland (28%) within 16 km, and grassland (35%), cropland (22%) and trees (21%) within 80 km.

3 km
288 m
16 km
629 m
80 km
1,720 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Mwandiga 57 km · Kigoma 62 km · Uvinza 67 km · Vyanda 76 km · Rumonge 100 km · Nguruka 120 km · Gitega 129 km · Kibondo 130 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 Kasulu (-4.5767°, 30.1025°, elevation 1,310 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). 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).