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The average temperature in Kocaeli over the whole year is 15°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 4°C. The rainy (wet) season in Kocaeli runs from November to March, peaking in December with a 24% chance of rain on a given day. The dry season is April to October; August is the driest month, at 6%. Winds in Kocaeli are highest in July, averaging 2.1 m/s (8 km/h), and lightest in October, at 1.5 m/s (5 km/h). The prevailing wind is from the N. The clearest skies in Kocaeli come in July, when the sky is typically 36% covered; January is the cloudiest month, at 66%.
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 9°C | 4°C | 6°C | 22% | 66% | 1.9 m/s | 8 | 0 | 43 |
| February | 11°C | 5°C | 8°C | 20% | 64% | 1.9 m/s | 16 | 1 | 55 |
| March | 13°C | 6°C | 10°C | 17% | 62% | 1.9 m/s | 26 | 0 | 65 |
| April | 18°C | 9°C | 15°C | 11% | 53% | 2.0 m/s | 58 | 6 | 78 |
| May | 21°C | 13°C | 20°C | 14% | 57% | 1.9 m/s | 75 | 23 | 63 |
| June | 27°C | 18°C | 27°C | 11% | 44% | 1.9 m/s | 51 | 62 | 18 |
| July | 29°C | 20°C | 30°C | 6% | 36% | 2.1 m/s | 27 | 70 | 6 |
| August | 29°C | 21°C | 31°C | 6% | 42% | 2.1 m/s | 21 | 68 | 3 |
| September | 26°C | 17°C | 26°C | 9% | 46% | 1.8 m/s | 59 | 56 | 27 |
| October | 20°C | 12°C | 20°C | 12% | 54% | 1.5 m/s | 78 | 16 | 70 |
| November | 15°C | 9°C | 14°C | 17% | 57% | 1.6 m/s | 44 | 3 | 77 |
| December | 11°C | 6°C | 8°C | 24% | 63% | 1.7 m/s | 15 | 0 | 59 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Year round, Kocaeli has days of about 9°C at their warmest in January, its coolest month, and 29°C in August, its warmest; the coolest hours of the day run from 4°C to 21°C through the year, and the average temperature over the year is 15°C around the clock. Rain is most likely around December and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Winter in Kocaeli has typical daily highs of about 10°C and lows of about 5°C, with a 22% chance of rain on a given day.
Spring in Kocaeli has typical daily highs of about 17°C and lows of about 9°C, with a 14% chance of rain on a given day.
Summer in Kocaeli has typical daily highs of about 28°C and lows of about 20°C, with a 8% chance of rain on a given day.
Autumn in Kocaeli has typical daily highs of about 20°C and lows of about 13°C, with a 13% chance of rain on a given day.
The rainy (wet) season in Kocaeli runs from November to March, peaking in December with a 24% chance of rain on a given day. The dry season is April to October; August is the driest month, at 6%.
Winds in Kocaeli are highest in July, averaging 2.1 m/s (8 km/h), and lightest in October, at 1.5 m/s (5 km/h). The prevailing wind is from the N.
The average temperature in Kocaeli over the whole year is 15°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 4°C.