The banner above is an illustration, not a photograph. It was drawn to suggest the place, and the details may differ from the real thing. Kocaeli Archaeological Museum
Monthly averages for Kocaeli from the Turkish State Meteorological Service, measured over 1929–2025.
The warmest month is August, with an average high of 29.9 °C. The coldest is January, when the average low is 3.3 °C. January has the most rainy days (16.7 on average), and August the fewest (5).
Month by month
| Month | Avg high °C | Avg low °C | Rainy days | Sun (h/day) |
|---|---|---|---|---|
| January | 9.8 | 3.3 | 16.7 | 2.6 |
| February | 10.7 | 3.5 | 14.7 | 3 |
| March | 13.3 | 4.9 | 13.8 | 4 |
| April | 18.6 | 8.5 | 11.1 | 5.8 |
| May | 23.3 | 12.8 | 9.7 | 7.3 |
| June | 27.6 | 16.7 | 8.1 | 8.9 |
| July | 29.7 | 19.1 | 5.7 | 9.5 |
| August | 29.9 | 19.3 | 5 | 9 |
| September | 26.3 | 16.2 | 7.2 | 7 |
| October | 21.1 | 12.5 | 11.3 | 4.7 |
| November | 16.6 | 8.8 | 12.2 | 3.6 |
| December | 12 | 5.5 | 16.1 | 2.6 |
January
In January, Kocaeli averages a high of 9.8 °C and a low of 3.3 °C, with about 16.7 rainy days.
February
In February, Kocaeli averages a high of 10.7 °C and a low of 3.5 °C, with about 14.7 rainy days.
March
In March, Kocaeli averages a high of 13.3 °C and a low of 4.9 °C, with about 13.8 rainy days.
April
In April, Kocaeli averages a high of 18.6 °C and a low of 8.5 °C, with about 11.1 rainy days.
May
In May, Kocaeli averages a high of 23.3 °C and a low of 12.8 °C, with about 9.7 rainy days.
June
In June, Kocaeli averages a high of 27.6 °C and a low of 16.7 °C, with about 8.1 rainy days.
July
In July, Kocaeli averages a high of 29.7 °C and a low of 19.1 °C, with about 5.7 rainy days.
August
In August, Kocaeli averages a high of 29.9 °C and a low of 19.3 °C, with about 5 rainy days.
September
In September, Kocaeli averages a high of 26.3 °C and a low of 16.2 °C, with about 7.2 rainy days.
October
In October, Kocaeli averages a high of 21.1 °C and a low of 12.5 °C, with about 11.3 rainy days.
November
In November, Kocaeli averages a high of 16.6 °C and a low of 8.8 °C, with about 12.2 rainy days.
December
In December, Kocaeli averages a high of 12 °C and a low of 5.5 °C, with about 16.1 rainy days.
Sources
Meteoroloji Genel Müdürlüğü — Kocaeli (1929–2025) (opens in a new tab)