Honiara climate

Name: Honiara
Address: SB

Honiara is warmest in December, with average highs of 29 °C, and coldest in August, when nights average 25 °C. January is the wettest month (355 mm) and June the driest (159 mm). Figures are 1991–2020 climate normals.

Across a full year Honiara averages 3,091 mm of rain and 365 days above 25 °C.

Solomon Islands · population 56,298 · 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 29 °C
Coldest month August 25 °C
Driest month June 159 mm
Wettest month January 355 mm
Least cloud August 74 % cloud
Hottest on record November 34 °C
Coldest on record August 20 °C
Warmest sea January 30 °C

What to expectHoniara through the year

Honiara changes little through the year. Average daily highs stay between 28 and 29 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 365 days a year reach 25 °C, 18 of them reach 30 °C. The warmest reading in the 1991–2020 record is 34 °C, in November.

Rain is strongly seasonal. January averages 355 mm against 159 mm in June — 2.2 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Honiara is warmest in January at 30 °C and coldest in August at 28 °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	29.2 °C	355 mm	86 %
February	29.0 °C	342 mm	88 %
March	29.0 °C	355 mm	85 %
April	29.0 °C	292 mm	81 %
May	28.8 °C	210 mm	80 %
June	28.6 °C	159 mm	76 %
July	28.3 °C	180 mm	77 %
August	28.3 °C	171 mm	74 %
September	28.6 °C	186 mm	75 %
October	28.8 °C	253 mm	77 %
November	29.1 °C	260 mm	80 %
December	29.2 °C	328 mm	82 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	29.2 °C	25.1 °C	26.9 °C	32.2 °C	21.9 °C	31	4
February	29.0 °C	25.1 °C	26.8 °C	33.3 °C	21.4 °C	28	3
March	29.0 °C	25.0 °C	26.7 °C	31.8 °C	21.6 °C	31	2
April	29.0 °C	25.0 °C	26.7 °C	30.6 °C	21.4 °C	30	1
May	28.8 °C	25.1 °C	26.7 °C	30.8 °C	21.3 °C	31	1
June	28.6 °C	25.1 °C	26.5 °C	31.2 °C	21.1 °C	30	0
July	28.3 °C	24.8 °C	26.2 °C	30.7 °C	20.7 °C	31	0
August	28.3 °C	24.7 °C	26.1 °C	30.6 °C	20.4 °C	31	0
September	28.6 °C	24.8 °C	26.4 °C	30.5 °C	21.2 °C	30	1
October	28.8 °C	24.8 °C	26.5 °C	32.0 °C	20.9 °C	31	1
November	29.1 °C	24.9 °C	26.7 °C	34.0 °C	21.6 °C	30	2
December	29.2 °C	25.0 °C	26.9 °C	31.9 °C	22.0 °C	31	3

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	355 mm	28	13 h/day	86 %	89 %	13 km/h	29.7 °C
February	342 mm	26	12 h/day	88 %	89 %	14 km/h	29.6 °C
March	355 mm	28	12 h/day	85 %	90 %	13 km/h	29.5 °C
April	292 mm	27	12 h/day	81 %	90 %	12 km/h	29.6 °C
May	210 mm	26	12 h/day	80 %	89 %	13 km/h	29.3 °C
June	159 mm	23	12 h/day	76 %	88 %	15 km/h	29.0 °C
July	180 mm	23	12 h/day	77 %	87 %	16 km/h	28.6 °C
August	171 mm	23	12 h/day	74 %	87 %	16 km/h	28.4 °C
September	186 mm	23	12 h/day	75 %	87 %	15 km/h	28.5 °C
October	253 mm	26	12 h/day	77 %	87 %	14 km/h	28.8 °C
November	260 mm	25	13 h/day	80 %	88 %	12 km/h	29.3 °C
December	328 mm	27	13 h/day	82 %	89 %	12 km/h	29.7 °C

Where Honiara ranks

Ranking	Position	Value
Warmest sea temperatures in the world in January	2nd of 50	30 °C
Warmest sea temperatures in the world in February	4th of 50	30 °C
Warmest sea temperatures in the world in December	6th of 50	30 °C
Warmest sea temperatures in the world in March	17th of 50	30 °C
Warmest sea temperatures in the world year-round	50th of 50	29 °C

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

QuestionsCommon questions about Honiara’s climate

When is the best time to visit Honiara?

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 June the driest. The month-by-month table above has the full picture.

How hot does Honiara get?

In December, the warmest month, daily highs average 29 °C. About 18 days a year pass 30 °C. The highest value in the 1991–2020 record is 34 °C.

How cold does it get in winter?

Nights average 25 °C in August, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Honiara?

January, averaging 355 mm over 28 days with rain. The driest month is June with 159 mm. The year as a whole averages 3,091 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 Honiara 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: -9.433°, 159.950° (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.