Semarang climate

Name: Semarang
Address: ID

Semarang is warmest in September, with average highs of 32 °C, and coldest in July, when nights average 23 °C. December is the wettest month (398 mm) and August the driest (24 mm). Figures are 1991–2020 climate normals.

Across a full year Semarang averages 2,324 mm of rain and 365 days above 25 °C.

Indonesia · population 1,694,740 · 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 September 32 °C
Coldest month July 23 °C
Driest month August 24 mm
Wettest month December 398 mm
Least cloud August 52 % cloud
Hottest on record October 37 °C
Coldest on record July 18 °C
Warmest sea May 30 °C

What to expectSemarang through the year

Semarang changes little through the year. Average daily highs stay between 31 and 32 °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, 148 of them reach 30 °C. The warmest reading in the 1991–2020 record is 37 °C, in October.

Rain is strongly seasonal. December averages 398 mm against 24 mm in August — 17 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Semarang is warmest in May at 30 °C and coldest in February at 29 °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	27.8 °C	375 mm	91 %
February	27.8 °C	339 mm	92 %
March	28.5 °C	323 mm	86 %
April	29.2 °C	223 mm	79 %
May	29.8 °C	102 mm	63 %
June	30.2 °C	58 mm	57 %
July	30.7 °C	38 mm	54 %
August	31.4 °C	24 mm	52 %
September	32.0 °C	44 mm	58 %
October	31.5 °C	135 mm	69 %
November	29.9 °C	266 mm	83 %
December	28.5 °C	398 mm	91 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	27.8 °C	23.6 °C	25.4 °C	30.7 °C	21.3 °C	31	1
February	27.8 °C	23.6 °C	25.4 °C	31.7 °C	21.9 °C	28	0
March	28.5 °C	23.5 °C	25.7 °C	32.0 °C	21.2 °C	31	2
April	29.2 °C	23.6 °C	26.1 °C	32.2 °C	20.9 °C	30	5
May	29.8 °C	23.5 °C	26.4 °C	34.2 °C	18.7 °C	31	12
June	30.2 °C	23.2 °C	26.4 °C	35.0 °C	19.6 °C	30	16
July	30.7 °C	22.8 °C	26.4 °C	35.2 °C	18.1 °C	31	21
August	31.4 °C	22.9 °C	26.8 °C	36.0 °C	19.0 °C	31	27
September	32.0 °C	23.7 °C	27.4 °C	36.7 °C	19.2 °C	30	27
October	31.5 °C	24.2 °C	27.4 °C	37.2 °C	18.5 °C	31	24
November	29.9 °C	24.0 °C	26.5 °C	36.5 °C	21.6 °C	30	12
December	28.5 °C	23.7 °C	25.7 °C	33.8 °C	20.2 °C	31	2

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	375 mm	29	12 h/day	91 %	88 %	14 km/h	29.0 °C
February	339 mm	27	12 h/day	92 %	88 %	15 km/h	28.5 °C
March	323 mm	28	12 h/day	86 %	88 %	11 km/h	29.0 °C
April	223 mm	25	12 h/day	79 %	86 %	8.5 km/h	29.6 °C
May	102 mm	16	12 h/day	63 %	82 %	8.9 km/h	29.8 °C
June	58 mm	11	12 h/day	57 %	77 %	9.8 km/h	29.3 °C
July	38 mm	6	12 h/day	54 %	72 %	11 km/h	28.7 °C
August	24 mm	4	12 h/day	52 %	67 %	12 km/h	28.6 °C
September	44 mm	6	12 h/day	58 %	67 %	12 km/h	28.9 °C
October	135 mm	15	12 h/day	69 %	73 %	11 km/h	29.3 °C
November	266 mm	25	12 h/day	83 %	83 %	9.0 km/h	29.8 °C
December	398 mm	29	13 h/day	91 %	88 %	11 km/h	29.6 °C

How Semarang 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
Semarang	32 °C	23 °C	2,324 mm	365
Ungaran · Indonesia	31 °C	21 °C	2,896 mm	358
Salatiga · Indonesia	30 °C	20 °C	2,934 mm	356
Jepara · Indonesia	32 °C	24 °C	2,646 mm	365
Surakarta · Indonesia	33 °C	21 °C	2,207 mm	365
Pekalongan · Indonesia	31 °C	23 °C	3,350 mm	365

Where Semarang ranks

Ranking	Position	Value
Warmest sea temperatures in Asia in December	10th of 50	30 °C
Warmest sea temperatures in Asia in November	10th of 50	30 °C
Warmest sea temperatures in the world in November	10th of 50	30 °C
Warmest sea temperatures in the world in December	13th of 50	30 °C
Warmest sea temperatures in Asia in January	18th of 50	29 °C
Warmest sea temperatures in the world in January	26th of 50	29 °C

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

QuestionsCommon questions about Semarang’s climate

When is the best time to visit Semarang?

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

How hot does Semarang get?

In September, the warmest month, daily highs average 32 °C. About 148 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average 23 °C in July, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Semarang?

December, averaging 398 mm over 29 days with rain. The driest month is August with 24 mm. The year as a whole averages 2,324 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 Semarang 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: -6.993°, 110.421° (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.