İzmit climate

Name: İzmit
Address: TR

İzmit is warmest in August, with average highs of 28 °C, and coldest in January, when nights average 1.4 °C. December is the wettest month (108 mm) and July the driest (42 mm). Figures are 1991–2020 climate normals.

Across a full year İzmit averages 919 mm of rain, 104 days above 25 °C and 29 days below freezing.

Turkey · population 196,571 · 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 August 28 °C
Coldest month January 1.4 °C
Driest month July 42 mm
Wettest month December 108 mm
Least cloud July 35 % cloud
Hottest on record July 41 °C
Coldest on record February -14 °C

What to expectİzmit through the year

İzmit has a clear annual cycle: average daily highs run from 8.9 °C in January to 28 °C in August, a swing of 19 °C in mean temperature across the year.

Counted across a normal year, 104 days a year reach 25 °C, 26 of them reach 30 °C, 29 nights drop below freezing. The warmest reading in the 1991–2020 record is 41 °C, in July.

Rain is strongly seasonal. December averages 108 mm against 42 mm in July — 2.6 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	8.9 °C	97 mm	70 %
February	10.3 °C	87 mm	69 %
March	13.2 °C	96 mm	65 %
April	17.9 °C	73 mm	60 %
May	22.3 °C	72 mm	54 %
June	26.0 °C	72 mm	42 %
July	28.2 °C	42 mm	35 %
August	28.5 °C	42 mm	37 %
September	25.1 °C	61 mm	45 %
October	20.5 °C	90 mm	60 %
November	15.5 °C	79 mm	63 %
December	10.5 °C	108 mm	70 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	8.9 °C	1.4 °C	4.9 °C	20.8 °C	-12.9 °C	0	0	10
February	10.3 °C	1.7 °C	5.8 °C	25.5 °C	-13.6 °C	0	0	9
March	13.2 °C	3.7 °C	8.3 °C	28.9 °C	-6.0 °C	0	0	4
April	17.9 °C	7.5 °C	12.7 °C	33.4 °C	-5.0 °C	3	0	0
May	22.3 °C	12.2 °C	17.4 °C	34.2 °C	5.0 °C	8	1	0
June	26.0 °C	16.6 °C	21.4 °C	40.3 °C	8.7 °C	18	4	0
July	28.2 °C	19.1 °C	23.6 °C	40.9 °C	13.3 °C	27	7	0
August	28.5 °C	19.7 °C	23.8 °C	38.4 °C	12.8 °C	27	10	0
September	25.1 °C	16.4 °C	20.4 °C	38.5 °C	9.4 °C	15	3	0
October	20.5 °C	12.4 °C	16.1 °C	35.4 °C	1.6 °C	5	1	0
November	15.5 °C	7.2 °C	11.0 °C	27.5 °C	-4.0 °C	1	0	1
December	10.5 °C	3.4 °C	6.6 °C	26.0 °C	-9.8 °C	0	0	5

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	97 mm	14	9.6 h/day	70 %	85 %	11 km/h
February	87 mm	13	11 h/day	69 %	82 %	12 km/h
March	96 mm	13	12 h/day	65 %	80 %	12 km/h
April	73 mm	11	13 h/day	60 %	78 %	12 km/h
May	72 mm	10	14 h/day	54 %	78 %	12 km/h
June	72 mm	10	15 h/day	42 %	77 %	12 km/h
July	42 mm	6	15 h/day	35 %	75 %	14 km/h
August	42 mm	6	14 h/day	37 %	76 %	15 km/h
September	61 mm	9	12 h/day	45 %	77 %	13 km/h
October	90 mm	11	11 h/day	60 %	82 %	11 km/h
November	79 mm	11	9.9 h/day	63 %	83 %	11 km/h
December	108 mm	13	9.3 h/day	70 %	85 %	11 km/h

How İzmit 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
İzmit	28 °C	1.4 °C	919 mm	104
Adapazarı · Turkey	28 °C	0.01 °C	918 mm	93
Gebze · Turkey	28 °C	2.1 °C	684 mm	83
Istanbul · Turkey	28 °C	4.0 °C	677 mm	85
Bağcılar · Turkey	27 °C	3.6 °C	677 mm	78
Bursa · Turkey	30 °C	1.8 °C	861 mm	114
Düzce · Turkey	27 °C	-0.6 °C	1,072 mm	83

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

QuestionsCommon questions about İzmit’s climate

When is the best time to visit İzmit?

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

How hot does İzmit get?

In August, the warmest month, daily highs average 28 °C. About 26 days a year pass 30 °C. The highest value in the 1991–2020 record is 41 °C.

How cold does it get in winter?

Nights average 1.4 °C in January, the coldest month. A normal year has 29 nights below freezing.

Which month is wettest in İzmit?

December, averaging 108 mm over 13 days with rain. The driest month is July with 42 mm. The year as a whole averages 919 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 İzmit 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.