Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 9.7 °C | 9.7 °C | 14 days | Unfavourable season |
| February | 12.3 °C | 8.4 °C | 12 days | Possible, with trade-offs |
| March | 14 °C | 8.7 °C | 14 days | Possible, with trade-offs |
| April | 18.9 °C | 11.2 °C | 10 days | Possible, with trade-offs |
| May | 22.6 °C | 15.7 °C | 12 days | Pleasant — a good time to go |
| June | 26.8 °C | 21.5 °C | 11 days | Pleasant — a good time to go |
| July | 29.3 °C | 24.8 °C | 7 days | Ideal — one of the best times of year |
| August | 30.2 °C | 25.5 °C | 7 days | Ideal — one of the best times of year |
| September | 26.7 °C | 23.9 °C | 9 days | Ideal — one of the best times of year |
| October | 21.1 °C | 20.1 °C | 9 days | Pleasant — a good time to go |
| November | 16.9 °C | 16.4 °C | 9 days | Possible, with trade-offs |
| December | 12.2 °C | 12.5 °C | 13 days | Possible, with trade-offs |
Nearby in December
Before you go
Three things to check once you have picked your dates.
Entry
No visa needed for stays of up to 90 days. Passport valid for at least 6 months. Passport must be valid 150 days after arrival, with 1 blank page; 90 days in any 180-day period.
For a British passport, per the UK Foreign Office on 22 July 2026. Rules change: check before booking.
Safety
Outside the areas advised against
Parts of the country are advised against (the 10 km strip along the Syrian border); İzmit is not one of them.
Official advice updated 22 July 2026
Health
Vaccines · typhoid recommended for most travellers; hepatitis A and hepatitis B if you are not already vaccinated; rabies depending on activities and areas visited. Routine vaccines up to date (measles in particular).
Yellow fever · No yellow fever locally, vaccine not recommended. No entry requirement.
Malaria · None.
Per the CDC (page reviewed 25 August 2026); see a travel clinic a few weeks before departure.
Beau Fixe is not a safety or health authority. These notes summarise dated public texts and link to their source: France Diplomatie (Licence Ouverte 2.0), Foreign, Commonwealth & Development Office (gov.uk, Open Government Licence v3.0), Centers for Disease Control and Prevention (Source: CDC). Only the competent authorities are authoritative.
FAQ
Can you swim in İzmit in December?
The sea averages 12.5°C in December — too cold for most swimmers.
How hot is İzmit in December?
Expect 12.2°C in the afternoon and 5°C at night, averaged over the last 10 years.
Does it rain a lot in İzmit in December?
Around 13 days with rain (≥ 1 mm) in the month — 41% of days.