Monthly Climate
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Best time to visit İzmit

May is the best time to visit İzmit for general sightseeing, with average highs of 22 °C and about 10 wet days. The comfortable season runs roughly May to October.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking May comfort 87/100
The least cloud July 35 % average cloud cover
The least rain July 42 mm
Warmth August 28 °C
Cooler weather January 8.9 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 May 87 22 °C 10
2 September 87 25 °C 9
3 October 85 20 °C 11
4 June 82 26 °C 10
5 July 80 28 °C 6
6 August 78 28 °C 6
7 April 74 18 °C 11
8 November 66 15 °C 11
9 March 52 13 °C 13
10 December 43 11 °C 13
11 February 41 10 °C 13
12 January 35 8.9 °C 14

When to think twice

January scores lowest with about 14 wet days and highs near 8.9 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

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 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. 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.