Fomboni weather in December

In December, Fomboni sees average daytime highs of 28°C and overnight lows near 26°C, with 84 mm of rain across 13 wet days and about 12.7 hours of daylight. It is the 5th-warmest and 5th-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 43% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 42 min at the start of December to 12 h 42 min by month's end. Set against the rest of the year, December is Fomboni's 9th-clearest and 11th-windiest month. For the whole year in context, see Fomboni's year-round climate.

Daytime high
28°
5th warmest
Overnight low
26°
8th coldest
Rainfall
84 mm
13 wet days
Daylight
12 h 42 min
5:40 AM – 6:23 PM
Cloud cover
52%
9th clearest
Wind
13 km/h
11th windiest
Solar energy
6.55 kWh/m²
Travel score
6.1
out of 10

Fomboni is Capital of Mohéli.

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 Fomboni reaches about 28°C in the afternoon and slips back to 26°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 28°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

24°26°28°30°32°151015202531
Avg high (°C)Avg low (°C)
12726
22726
32726
42726
52726
62726
72726
82726
92726
102826
112826
122826
132826
142826
152826
162826
172826
182826
192826
202826
212826
222826
232827
242827
252827
262827
272827
282827
292827
302827
312827

How December really feels in Fomboni

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.

Fomboni weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 27°16817.612.65.1
Feb28° / 27°15916.912.44.8
Mar28° / 27°13919.512.14.7
Apr28° / 27°8814.111.75.8
May27° / 26°316.911.47.4
Jun26° / 25°174.111.38.1
Jul25° / 24°133.311.48.5
Aug25° / 24°82.411.68.8
Sep25° / 24°72.211.98.8
Oct26° / 25°133.212.38.4
Nov27° / 26°314.912.67.8
Dec28° / 26°841312.76.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17723
27624
37525
47426
57327
67228
77129
87030
96931
106733
116634
126535
136337
146238
156139
165941
175842
185644
195545
205347
215248
225149
235050
245050
254852
264654
274654
284555
294456
304258
314159

Chance of precipitation in December

Any precipitation

Fomboni gets around 84 mm of rain over 13 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 42% and peaks near 53% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
127
228
329
430
531
632
733
834
935
1036
1137
1238
1339
1440
1541
1642
1744
1845
1946
2047
2148
2248
2349
2450
2550
2651
2751
2852
2952
3053
3153

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 83% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
11936
21936
31927
41927
51918
61918
71909
809010
908911
1008911
1108812
1208713
1308713
1408614
1508515
1608515
1708416
1808317
1908218
2008119
2108020
2207921
2307822
2407723
2507525
2607426
2707327
2807129
2907030
3006931
3106931

Wind in December

Winds average 13 km/h in December.

Across December, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 42 min at the start of December to 12 h 42 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 5:35 AM to 5:47 AM, and sunset from 6:15 PM to 6:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:356:15
212.75:356:15
312.75:356:16
412.75:356:16
512.75:366:17
612.75:366:18
712.75:366:18
812.75:376:19
912.75:376:19
1012.75:376:20
1112.75:386:20
1212.75:386:21
1312.75:386:21
1412.75:396:22
1512.75:396:22
1612.75:406:23
1712.75:406:23
1812.75:416:24
1912.75:416:24
2012.75:416:25
2112.75:426:25
2212.75:426:26
2312.75:436:26
2412.75:436:27
2512.75:446:27
2612.75:446:27
2712.75:456:28
2812.75:456:28
2912.75:466:29
3012.75:466:29
3112.75:476:30

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.55 kWh/m².

For context, solar energy here swings from a low near 4.72 kWh/m² to a high of 6.95 kWh/m² in November across the year — December's 6.55 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.9Intense
26.8Intense
36.8Intense
46.8Intense
56.8Intense
66.8Intense
76.8Intense
86.8Intense
96.7Intense
106.7Intense
116.7Intense
126.7Intense
136.6Intense
146.6Intense
156.6Intense
166.5Intense
176.5Intense
186.5Intense
196.5Intense
206.4Intense
216.4Intense
226.4Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.2Intense
296.2Intense
306.2Intense
316.2Intense
Planning a trip in December

Hazard calendar for Fomboni

In seasonPeak

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

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

Fomboni's rainy season runs December–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 Fomboni?

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

6.1
Sightseeing
8th-best month of the year
6.5
Beach & pool
8th-best month of the year

December is a reasonable time to visit Fomboni for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Fomboni in December

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

In December, Fomboni sees daytime highs around 28°C and nights near 26°C. Pack light clothes and sun protection. Worth having: rain gear. About 13 days see rain.

light clothessun protectionrain gear

Sea temperature near Fomboni in December

The nearest coast averages about 29°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in March at about 30°C and coldest in August near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar30Tropical
Apr29Tropical
May28Tropical
Jun27Warm
Jul26Warm
Aug26Warm
Sep26Warm
Oct27Warm
Nov28Warm
Dec29Tropical

UV index in Fomboni 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 Fomboni peaks around February 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 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 highExtremeFeb 15UV 15Jun 20UV 9
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar14Extreme
Apr12Extreme
May10Very high
Jun9Very high
Jul9Very high
Aug11Extreme
Sep12Extreme
Oct13Extreme
Nov12Extreme
Dec13Extreme
Location & terrain

Where is Fomboni?

Fomboni sits at 12.3°S, 43.7°E, 18 m above sea level, in Comoros. The nearest listed city is Moutsamoudou, 73 km away.

MoutsamoudouMoroni

Topography around Fomboni

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

Within 3 km, the terrain around Fomboni has significant variations in elevation — a maximum elevation change of 554 m around an average of 100 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 780 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,346 m.

The land around Fomboni is covered by trees (52%) and water (39%) within 3 km, water (75%) and trees (24%) within 16 km, and water (92%) within 80 km.

3 km
554 m
16 km
780 m
80 km
2,346 m
treesgrasslandartificial surfaceswater
December weather nearby: Moutsamoudou 73 km · Moroni 84 km · Koungou 166 km · Mtsapéré 169 km · Kaouéni 169 km · Mamoudzou 170 km · Dzaoudzi 173 km · Labattoir 176 km

Comoros travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
220 V · 50 Hz
Prices
≈ 49% of US
price level, 2025
GDP per capita
$2,056
2025
Happiness
3.9 / 10
World Happiness, 2025
Road deaths
26.6
per 100k/yr, 2019
Income group
Lower middle
World Bank
Religion
Muslim 98%ethnic religionist 1%Christian 1%other 0%

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 Fomboni (-12.2876°, 43.7434°, elevation 18 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). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).