Njombe weather in December

In December, Njombe sees average daytime highs of 23°C and overnight lows near 15°C, with 171 mm of rain across 20.8 wet days and about 12.5 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 14% of the time in December, and the air most often feels comfortable.

Daylight stretches from about 12 h 30 min at the start of December to 12 h 30 min by month's end. Set against the rest of the year, December is Njombe's 9th-clearest and 9th-windiest month. For the whole year in context, see Njombe's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
171 mm
20.8 wet days
Daylight
12 h 30 min
6:21 AM – 6:53 PM
Cloud cover
74%
9th clearest
Wind
8 km/h
9th windiest
Solar energy
5.41 kWh/m²
Travel score
5.0
out of 10

Njombe is town in Njombe 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 23°C through the month.

A typical December day in Njombe reaches about 23°C in the afternoon and slips back to 15°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 25°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12315
22315
32315
42315
52315
62315
72315
82315
92315
102315
112315
122315
132315
142315
152315
162315
172315
182315
192315
202315
212315
222315
232315
242315
252315
262315
272315
282315
292315
302315
312315

Njombe weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan23° / 15°26826.512.54.1
Feb23° / 15°26023.612.34.1
Mar22° / 15°22827.212.14.0
Apr21° / 14°8318.611.85.1
May21° / 12°185.411.67.1
Jun20° / 10°30.811.57.7
Jul19° / 20.411.57.7
Aug20° / 10°40.911.77.9
Sep22° / 11°40.911.98.3
Oct24° / 13°185.512.27.8
Nov24° / 14°5410.512.46.8
Dec23° / 15°17120.812.55.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 72%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13961
23763
33763
43763
53466
63466
73466
83367
93268
103268
113169
122971
132971
142971
152872
162872
172773
182773
192773
202674
212674
222575
232575
242476
252377
262377
272278
282179
292179
302080
311981

Chance of precipitation in December

Any precipitation

Njombe gets around 171 mm of rain over 20.8 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 67% and peaks near 77% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
153
254
354
455
556
657
758
860
961
1062
1163
1264
1365
1467
1568
1669
1770
1871
1971
2072
2172
2273
2373
2474
2574
2675
2775
2876
2976
3076
3177

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 75% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
131645
230646
329656
427676
526677
624697
723707
821727
920728
1018748
1117758
1216759
1315769
14147610
15137710
16127810
17127810
18127711
19127711
20117811
21117811
22117811
23117811
24117811
25117811
26117811
27107911
28107911
29107812
3097912
3197912

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 7 km/h on the calmest days to 9 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
98calm
108calm
118calm
128calm
138calm
148calm
158calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 30 min at the start of December to 12 h 30 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 6:15 AM to 6:28 AM, and sunset from 6:46 PM to 7:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.56:156:46
212.56:166:46
312.56:166:47
412.56:166:47
512.56:176:48
612.56:176:48
712.56:176:49
812.56:186:49
912.56:186:50
1012.56:186:50
1112.56:196:51
1212.56:196:51
1312.56:206:52
1412.56:206:52
1512.56:206:53
1612.56:216:53
1712.56:216:54
1812.56:226:54
1912.56:226:55
2012.56:236:55
2112.56:236:56
2212.56:246:56
2312.56:246:57
2412.56:246:57
2512.56:256:58
2612.56:256:58
2712.56:266:59
2812.56:266:59
2912.56:276:59
3012.56:277:00
3112.56:287:00

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.41 kWh/m².

For context, solar energy here swings from a low near 4.73 kWh/m² to a high of 6.65 kWh/m² in October across the year — December's 5.41 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.7Bright
55.7Bright
65.7Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.4Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in December

Hazard calendar for Njombe

In seasonPeak

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

Njombe's monsoon runs December–March, when most of the year's rain falls.

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

Is December a good time to visit Njombe?

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

5.0
Sightseeing
9th-best month of the year
4.0
Beach & pool
6th-best month of the year

December is a reasonable time to visit Njombe for sightseeing.

What to pack for Njombe in December

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

In December, Njombe sees daytime highs around 23°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 21 days see rain.

rain gearlight clothessun protection

UV index in Njombe in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Njombe peaks around February 22 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 15 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 22UV 16Jun 15UV 10
UV index (midday)Level
Jan16Extreme
Feb16Extreme
Mar16Extreme
Apr15Extreme
May11Extreme
Jun10Extreme
Jul11Extreme
Aug12Extreme
Sep13Extreme
Oct15Extreme
Nov14Extreme
Dec14Extreme

Air quality in Njombe 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 Njombe is worst in October — around 21 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (May, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodOct 1620 µg/m³May 157 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb11Good
Mar10Good
Apr8Good
May7Good
Jun8Good
Jul11Good
Aug14Moderate
Sep17Moderate
Oct21Moderate
Nov17Moderate
Dec10Good
Location & terrain

Where is Njombe?

Njombe sits at 9.3°S, 34.8°E, 1,960 m above sea level, in Tanzania. The nearest listed city is Mtwango, 37 km away.

RujewaMahanjeUrundaIpinda

Topography around Njombe

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

Within 3 km, the terrain around Njombe has only modest variations in elevation — a maximum elevation change of 221 m around an average of 1,902 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 563 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,440 m.

The land around Njombe is covered by artificial surfaces (31%) and cropland (24%) within 3 km, trees (30%), grassland (28%) and shrubs (21%) within 16 km, and shrubs (32%), trees (31%) and grassland (20%) within 80 km.

3 km
221 m
16 km
563 m
80 km
2,440 m
treesshrubsgrasslandcroplandartificial surfaceswater
December weather nearby: Mtwango 37 km · Ilembula 54 km · Mlangali 56 km · Makumbako 56 km · Rujewa 84 km · Mahanje 89 km · Urunda 93 km · Ipinda 97 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 Njombe (-9.3492°, 34.7717°, elevation 1,960 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).