Moroni climate

Name: Moroni
Address: KM

Moroni is warmest in December, with average highs of 31 °C, and coldest in August, when nights average 22 °C. January is the wettest month (264 mm) and September the driest (36 mm). Figures are 1991–2020 climate normals.

Across a full year Moroni averages 1,435 mm of rain and 364 days above 25 °C.

Comoros · population 74,749 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month December 31 °C
Coldest month August 22 °C
Driest month September 36 mm
Wettest month January 264 mm
Least cloud August 33 % cloud
Hottest on record December 42 °C
Coldest on record August 16 °C
Warmest sea March 29 °C

What to expectMoroni through the year

Moroni has a clear annual cycle: average daily highs run from 27 °C in August to 31 °C in December, a swing of 3.6 °C in mean temperature across the year.

Counted across a normal year, 364 days a year reach 25 °C, 122 of them reach 30 °C. The warmest reading in the 1991–2020 record is 42 °C, in December.

Rain is strongly seasonal. January averages 264 mm against 36 mm in September — 7.3 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Moroni is warmest in March at 29 °C and coldest in August at 26 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	30.2 °C	264 mm	78 %
February	30.2 °C	224 mm	78 %
March	30.2 °C	215 mm	70 %
April	29.9 °C	153 mm	55 %
May	28.8 °C	89 mm	44 %
June	27.4 °C	53 mm	41 %
July	26.7 °C	49 mm	39 %
August	27.1 °C	41 mm	33 %
September	28.3 °C	36 mm	34 %
October	29.5 °C	47 mm	37 %
November	30.4 °C	82 mm	43 %
December	30.5 °C	183 mm	60 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	30.2 °C	26.4 °C	28.0 °C	34.6 °C	22.0 °C	31	19
February	30.2 °C	26.4 °C	28.0 °C	33.2 °C	23.0 °C	28	17
March	30.2 °C	26.3 °C	27.9 °C	34.8 °C	22.7 °C	31	19
April	29.9 °C	26.0 °C	27.6 °C	34.6 °C	21.6 °C	30	12
May	28.8 °C	25.1 °C	26.7 °C	31.5 °C	19.1 °C	31	3
June	27.4 °C	23.6 °C	25.3 °C	29.9 °C	18.6 °C	30	0
July	26.7 °C	22.7 °C	24.5 °C	30.2 °C	16.7 °C	30	0
August	27.1 °C	22.2 °C	24.4 °C	30.0 °C	16.2 °C	31	0
September	28.3 °C	22.7 °C	25.2 °C	31.5 °C	16.8 °C	30	1
October	29.5 °C	24.0 °C	26.4 °C	33.4 °C	19.1 °C	31	9
November	30.4 °C	25.3 °C	27.5 °C	33.5 °C	20.9 °C	30	19
December	30.5 °C	26.0 °C	27.9 °C	41.6 °C	22.6 °C	31	22

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	264 mm	23	13 h/day	78 %	85 %	13 km/h	29.0 °C
February	224 mm	21	12 h/day	78 %	85 %	13 km/h	29.1 °C
March	215 mm	26	12 h/day	70 %	86 %	11 km/h	29.4 °C
April	153 mm	22	12 h/day	55 %	85 %	12 km/h	29.2 °C
May	89 mm	17	12 h/day	44 %	83 %	15 km/h	28.3 °C
June	53 mm	15	11 h/day	41 %	81 %	16 km/h	27.2 °C
July	49 mm	14	12 h/day	39 %	81 %	17 km/h	26.1 °C
August	41 mm	11	12 h/day	33 %	81 %	14 km/h	25.6 °C
September	36 mm	9	12 h/day	34 %	80 %	11 km/h	25.9 °C
October	47 mm	10	12 h/day	37 %	79 %	10 km/h	26.6 °C
November	82 mm	13	13 h/day	43 %	79 %	9.7 km/h	27.7 °C
December	183 mm	22	13 h/day	60 %	83 %	9.8 km/h	28.8 °C

How Moroni compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Moroni	31 °C	22 °C	1,435 mm	364
Mamoudzou · Mayotte	28 °C	23 °C	939 mm	353
Pemba · Mozambique	31 °C	20 °C	1,041 mm	361
Nacala · Mozambique	30 °C	19 °C	1,190 mm	353
Nampula · Mozambique	32 °C	16 °C	898 mm	323

Where Moroni ranks

Ranking	Position	Value
Warmest sea temperatures in Africa in December	3rd of 50	29 °C
Warmest sea temperatures in Africa in January	4th of 50	29 °C
Warmest sea temperatures in Africa in March	4th of 50	29 °C
Warmest sea temperatures in Africa in February	5th of 50	29 °C
Warmest sea temperatures in Africa in April	6th of 50	29 °C
Warmest sea temperatures in Africa year-round	16th of 50	28 °C

Planning a trip? See the best time to visit Moroni.

QuestionsCommon questions about Moroni’s climate

When is the best time to visit Moroni?

That depends on what you want, so the honest answer is a comparison rather than a single month. July, August, September sit closest to 20 °C on average, December is the warmest month and September the driest. The month-by-month table above has the full picture.

How hot does Moroni get?

In December, the warmest month, daily highs average 31 °C. About 122 days a year pass 30 °C. The highest value in the 1991–2020 record is 42 °C.

How cold does it get in winter?

Nights average 22 °C in August, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Moroni?

January, averaging 264 mm over 23 days with rain. The driest month is September with 36 mm. The year as a whole averages 1,435 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Moroni rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: -11.702°, 43.255° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.