Jember climate

Name: Jember
Address: ID

Jember is warmest in October, with average highs of 30 °C, and coldest in August, when nights average 21 °C. January is the wettest month (364 mm) and August the driest (25 mm). Figures are 1991–2020 climate normals.

Across a full year Jember averages 2,238 mm of rain and 365 days above 25 °C.

Indonesia · population 298,585 · 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 October 30 °C
Coldest month August 21 °C
Driest month August 25 mm
Wettest month January 364 mm
Least cloud June 60 % cloud
Hottest on record October 40 °C
Coldest on record August 15 °C

What to expectJember through the year

Jember changes little through the year. Average daily highs stay between 29 and 30 °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, 83 of them reach 30 °C. The warmest reading in the 1991–2020 record is 40 °C, in October.

Rain is strongly seasonal. January averages 364 mm against 25 mm in August — 15 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	28.5 °C	364 mm	91 %
February	28.8 °C	328 mm	91 %
March	29.2 °C	319 mm	83 %
April	29.4 °C	207 mm	77 %
May	29.5 °C	105 mm	63 %
June	29.0 °C	65 mm	60 %
July	28.5 °C	38 mm	61 %
August	28.9 °C	25 mm	62 %
September	29.7 °C	59 mm	67 %
October	30.3 °C	123 mm	70 %
November	29.4 °C	267 mm	81 %
December	28.5 °C	338 mm	90 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	28.5 °C	22.9 °C	25.2 °C	32.4 °C	20.8 °C	31	3
February	28.8 °C	22.9 °C	25.4 °C	33.0 °C	20.2 °C	28	4
March	29.2 °C	22.9 °C	25.6 °C	33.2 °C	18.2 °C	31	7
April	29.4 °C	22.8 °C	25.7 °C	33.7 °C	18.7 °C	30	8
May	29.5 °C	22.3 °C	25.5 °C	34.5 °C	15.6 °C	31	9
June	29.0 °C	21.6 °C	24.8 °C	34.0 °C	15.7 °C	30	6
July	28.5 °C	20.8 °C	24.2 °C	33.1 °C	15.2 °C	31	4
August	28.9 °C	20.6 °C	24.2 °C	34.8 °C	15.0 °C	31	6
September	29.7 °C	21.5 °C	24.9 °C	35.5 °C	15.7 °C	30	11
October	30.3 °C	22.5 °C	25.7 °C	39.6 °C	16.9 °C	31	15
November	29.4 °C	23.0 °C	25.7 °C	36.3 °C	19.1 °C	30	9
December	28.5 °C	22.9 °C	25.3 °C	35.6 °C	19.9 °C	31	3

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	364 mm	29	13 h/day	91 %	90 %	8.9 km/h
February	328 mm	27	12 h/day	91 %	89 %	8.5 km/h
March	319 mm	27	12 h/day	83 %	88 %	8.0 km/h
April	207 mm	24	12 h/day	77 %	88 %	7.8 km/h
May	105 mm	15	12 h/day	63 %	85 %	9.1 km/h
June	65 mm	11	12 h/day	60 %	84 %	10 km/h
July	38 mm	7	12 h/day	61 %	82 %	11 km/h
August	25 mm	6	12 h/day	62 %	80 %	12 km/h
September	59 mm	10	12 h/day	67 %	80 %	12 km/h
October	123 mm	18	12 h/day	70 %	82 %	11 km/h
November	267 mm	25	12 h/day	81 %	87 %	8.6 km/h
December	338 mm	28	13 h/day	90 %	89 %	9.0 km/h

How Jember 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
Jember	30 °C	21 °C	2,238 mm	365
Situbondo · Indonesia	32 °C	22 °C	2,301 mm	365
Probolinggo · Indonesia	31 °C	24 °C	1,451 mm	365
Pasuruan · Indonesia	32 °C	22 °C	1,710 mm	365
Singosari · Indonesia	30 °C	19 °C	2,303 mm	359
Malang · Indonesia	30 °C	19 °C	2,341 mm	360
Batu · Indonesia	28 °C	18 °C	3,088 mm	313

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

QuestionsCommon questions about Jember’s climate

When is the best time to visit Jember?

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

How hot does Jember get?

In October, the warmest month, daily highs average 30 °C. About 83 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.

How cold does it get in winter?

Nights average 21 °C in August, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Jember?

January, averaging 364 mm over 29 days with rain. The driest month is August with 25 mm. The year as a whole averages 2,238 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 Jember 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.