Fomboni, Comoros climate

Am Tropical monsoon

Fomboni has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is December with an average daily high near 32°C, while the coldest is August averaging around 20°C at night. Precipitation totals about 2315 mm a year and is strongly seasonal — January alone averages 460 mm while August barely receives 31 mm.

☀️ All year

Hot

Daytime highs near 32°C most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 20°C.

🌧️ Rain

Very wet

About 2315 mm of rain a year.

Wettest in January

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Fomboni climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	31	31	32	32	31	30	29	29	30	31	32	32
Avg temp (°C)	28	28	28	28	27	26	25	25	25	27	28	28
Avg low (°C)	24	24	24	24	23	22	21	20	21	23	24	24
Precipitation (mm)	460	315	387	282	92	42	49	31	94	88	132	343

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	31	31	32	32	31	30
Avg temp (°C)	28	28	28	28	27	26
Avg low (°C)	24	24	24	24	23	22
Precipitation (mm)	460	315	387	282	92	42

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	29	29	30	31	32	32
Avg temp (°C)	25	25	25	27	28	28
Avg low (°C)	21	20	21	23	24	24
Precipitation (mm)	49	31	94	88	132	343

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	66	67	59	48	39	37	39	35	34	33	34	48
Relative humidity (%)	80	81	79	77	76	74	74	74	74	76	77	78
Wind speed (mph)	9.6	8.8	7.3	8.6	10.4	11.2	11.2	8.9	7.9	8.4	8.4	7.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	66	67	59	48	39	37
Relative humidity (%)	80	81	79	77	76	74
Wind speed (mph)	9.6	8.8	7.3	8.6	10.4	11.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	39	35	34	33	34	48
Relative humidity (%)	74	74	74	76	77	78
Wind speed (mph)	11.2	8.9	7.9	8.4	8.4	7.6

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 24 years of daily observations at Prince Said Ibrahim, a weather station, about 98 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →