Masasi weather in December

In December, Masasi sees average daytime highs of 33°C and overnight lows near 23°C, with 103 mm of rain across 15.1 wet days and about 12.6 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 28% of the time in December, and the air most often feels muggy.

Daylight stretches from about 12 h 36 min at the start of December to 12 h 36 min by month's end. Set against the rest of the year, December is Masasi's 9th-clearest and 9th-windiest month. For the whole year in context, see Masasi's year-round climate.

Daytime high
33°
3rd warmest
Overnight low
23°
12th coldest
Rainfall
103 mm
15.1 wet days
Daylight
12 h 36 min
6:02 AM – 6:40 PM
Cloud cover
62%
9th clearest
Wind
9 km/h
9th windiest
Solar energy
6.02 kWh/m²
Travel score
3.2
out of 10

Masasi is town in Mtwara 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 33°C through the month.

A typical December day in Masasi reaches about 33°C in the afternoon and slips back to 23°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 35°C. Set against its neighbours, December runs about 1°C cooler than November and about 1°C warmer than January.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13323
23323
33323
43323
53323
63323
73323
83323
93323
103323
113323
123323
133323
143323
153323
163323
173323
183323
193323
203223
213223
223223
233223
243223
253223
263223
273223
283223
293223
303223
313223

How December really feels in Masasi

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.

Masasi 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
Jan32° / 23°13418.312.63.3
Feb31° / 23°13017.212.43.4
Mar30° / 22°15522.412.13.5
Apr30° / 22°6712.611.84.7
May30° / 20°112.111.55.9
Jun29° / 19°10.311.46.9
Jul29° / 18°10.211.47.1
Aug30° / 19°10.411.66.4
Sep32° / 20°20.611.95.4
Oct33° / 21°9212.24.4
Nov34° / 22°32612.53.6
Dec33° / 23°10315.112.63.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 54%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26040
35941
45842
55743
65644
75545
85446
95347
105248
115149
124951
134951
144753
154555
164555
174456
184357
194258
204159
214060
224060
233961
243862
253763
263664
273565
283466
293466
303268
313169

Chance of precipitation in December

Any precipitation

Masasi gets around 103 mm of rain over 15.1 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 48% and peaks near 54% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
138
239
340
441
542
643
744
845
946
1046
1147
1248
1348
1449
1549
1650
1750
1851
1951
2051
2151
2252
2352
2452
2552
2652
2752
2853
2953
3054
3154

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 95% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
1126523
2116524
3106426
496328
586329
686131
776132
866034
965935
1055837
1155639
1255540
1345442
1445343
1545145
1635146
1734948
1834849
1934750
2034750
2134651
2234552
2324553
2424454
2524454
2624355
2724256
2824157
2924157
3034057
3133859

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 9 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
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 36 min at the start of December to 12 h 36 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 5:57 AM to 6:09 AM, and sunset from 6:32 PM to 6:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:576:32
212.65:576:33
312.65:586:33
412.65:586:34
512.65:586:34
612.65:596:35
712.65:596:35
812.65:596:36
912.66:006:36
1012.66:006:37
1112.66:006:37
1212.66:016:38
1312.66:016:38
1412.66:016:39
1512.66:026:39
1612.66:026:40
1712.66:036:40
1812.66:036:41
1912.66:046:41
2012.66:046:42
2112.66:046:42
2212.66:056:43
2312.66:056:43
2412.66:066:44
2512.66:066:44
2612.66:076:44
2712.66:076:45
2812.66:086:45
2912.66:086:46
3012.66:096:46
3112.66:096:47

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.02 kWh/m².

For context, solar energy here swings from a low near 4.99 kWh/m² to a high of 6.53 kWh/m² in November across the year — December's 6.02 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.3Intense
26.2Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.2Intense
86.1Intense
96.1Intense
106.1Intense
116.1Intense
126.1Intense
136.0Intense
146.0Intense
156.0Intense
166.0Bright
176.0Bright
186.0Bright
195.9Bright
205.9Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in December

Hazard calendar for Masasi

In seasonPeak

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

Masasi's rainy season runs December–March, 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 Masasi?

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

3.2
Sightseeing
12th-best month of the year
5.6
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Masasi.

What to pack for Masasi in December

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

In December, Masasi sees daytime highs around 33°C and nights near 23°C. Pack light clothes, rain gear and sun protection. About 15 days see rain.

light clothesrain gearsun protection

UV index in Masasi 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 Masasi peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 12UV 15Jun 23UV 9
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar15Extreme
Apr13Extreme
May10Very high
Jun9Very high
Jul9Very high
Aug11Extreme
Sep12Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme

Air quality in Masasi 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 Masasi is worst in July — around 18 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (May, 10 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateGoodJul 2418 µg/m³May 1510 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb12Moderate
Mar11Good
Apr11Good
May10Good
Jun12Good
Jul18Moderate
Aug18Moderate
Sep11Good
Oct10Good
Nov12Good
Dec10Good
Location & terrain

Where is Masasi?

Masasi sits at 10.7°S, 38.8°E, 449 m above sea level, in Tanzania. The nearest listed city is Lukuledi, 17 km away.

Topography around Masasi

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

Within 3 km, the terrain around Masasi has significant variations in elevation — a maximum elevation change of 448 m around an average of 421 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 654 m; within 80 km, large variations in elevation — a maximum elevation change of 883 m.

The land around Masasi is covered by trees (29%) and artificial surfaces (27%) within 3 km, shrubs (42%) and grassland (35%) within 16 km, and trees (39%), shrubs (33%) and grassland (20%) within 80 km.

3 km
448 m
16 km
654 m
80 km
883 m
treesshrubsgrasslandcroplandartificial surfaceswater
December weather nearby: Lukuledi 17 km · Nachingwea 38 km · Nangomba 39 km · Nanganga 53 km · Newala Kisimani 59 km · Newala 60 km · Luchingu 62 km · Nyangao 68 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 Masasi (-10.7167°, 38.8°, elevation 449 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).