Banjarmasin climate

Name: Banjarmasin
Address: ID

Banjarmasin is warmest in September, with average highs of 32 °C, and coldest in July, when nights average 23 °C. December is the wettest month (340 mm) and August the driest (58 mm). Figures are 1991–2020 climate normals.

Across a full year Banjarmasin averages 2,374 mm of rain and 365 days above 25 °C.

Indonesia · population 657,663 · 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 58 mm
Wettest month December 340 mm
Least cloud August 63 % cloud
Hottest on record October 37 °C
Coldest on record July 20 °C

What to expectBanjarmasin through the year

Banjarmasin changes little through the year. Average daily highs stay between 30 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, 189 of them reach 30 °C. The warmest reading in the 1991–2020 record is 37 °C, in October.

Rain is strongly seasonal. December averages 340 mm against 58 mm in August — 5.9 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	29.4 °C	302 mm	94 %
February	29.6 °C	268 mm	93 %
March	29.8 °C	290 mm	90 %
April	30.0 °C	243 mm	87 %
May	30.2 °C	159 mm	75 %
June	29.8 °C	119 mm	69 %
July	29.8 °C	93 mm	65 %
August	30.9 °C	58 mm	63 %
September	31.7 °C	78 mm	68 %
October	31.5 °C	162 mm	81 %
November	30.1 °C	263 mm	92 %
December	29.2 °C	340 mm	95 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	29.4 °C	23.8 °C	26.0 °C	32.9 °C	22.2 °C	31	9
February	29.6 °C	23.8 °C	26.2 °C	33.2 °C	22.4 °C	28	11
March	29.8 °C	23.9 °C	26.3 °C	32.7 °C	22.6 °C	31	14
April	30.0 °C	24.1 °C	26.4 °C	32.9 °C	22.5 °C	30	16
May	30.2 °C	24.2 °C	26.7 °C	32.8 °C	21.6 °C	31	19
June	29.8 °C	23.8 °C	26.3 °C	33.2 °C	21.4 °C	30	13
July	29.8 °C	23.4 °C	26.1 °C	33.7 °C	20.3 °C	31	12
August	30.9 °C	23.5 °C	26.7 °C	34.9 °C	20.5 °C	31	22
September	31.7 °C	23.7 °C	27.2 °C	36.2 °C	20.6 °C	30	25
October	31.5 °C	23.9 °C	27.2 °C	36.9 °C	20.9 °C	31	24
November	30.1 °C	24.0 °C	26.4 °C	35.1 °C	22.2 °C	30	15
December	29.2 °C	23.8 °C	26.0 °C	32.5 °C	22.4 °C	31	8

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	302 mm	29	12 h/day	94 %	88 %	11 km/h
February	268 mm	25	12 h/day	93 %	87 %	11 km/h
March	290 mm	28	12 h/day	90 %	87 %	10 km/h
April	243 mm	27	12 h/day	87 %	88 %	9.3 km/h
May	159 mm	22	12 h/day	75 %	86 %	9.7 km/h
June	119 mm	17	12 h/day	69 %	85 %	11 km/h
July	93 mm	14	12 h/day	65 %	82 %	12 km/h
August	58 mm	10	12 h/day	63 %	76 %	14 km/h
September	78 mm	11	12 h/day	68 %	75 %	14 km/h
October	162 mm	19	12 h/day	81 %	80 %	13 km/h
November	263 mm	27	12 h/day	92 %	86 %	11 km/h
December	340 mm	29	12 h/day	95 %	89 %	12 km/h

How Banjarmasin 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
Banjarmasin	32 °C	23 °C	2,374 mm	365
Banjarbaru · Indonesia	32 °C	23 °C	2,622 mm	365
Palangkaraya · Indonesia	32 °C	23 °C	2,670 mm	365
Sampit · Indonesia	31 °C	23 °C	2,695 mm	365
Balikpapan · Indonesia	29 °C	24 °C	2,499 mm	365
Loa Janan · Indonesia	31 °C	23 °C	2,917 mm	365
Samarinda · Indonesia	31 °C	23 °C	2,992 mm	365

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

QuestionsCommon questions about Banjarmasin’s climate

When is the best time to visit Banjarmasin?

That depends on what you want, so the honest answer is a comparison rather than a single month. January, July, 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 Banjarmasin get?

In September, the warmest month, daily highs average 32 °C. About 189 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 Banjarmasin?

December, averaging 340 mm over 29 days with rain. The driest month is August with 58 mm. The year as a whole averages 2,374 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 Banjarmasin 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
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.