Climate Insights for Kastamonu

The climate in Kastamonu is temperate. The average annual temperature is 10°C and approximately 848mm of precipitation falls per year. Kastamonu receives a notable amount of rainfall throughout the year, including during its driest month. Kastamonu is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, December, February, when temperatures can drop to -3°C. Kastamonu experiences heavy snowfall, typically from January through December.

Temperatures in Kastamonu vary considerably across the year, with a 28°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 25°C and the mean temperature sits around 20°C. The coldest month is January, when overnight lows fall to -3°C and the daily average is 0°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Kastamonu is a moderately rainy area, receiving approximately 848mm of precipitation annually, which averages out to around 71mm per month. The wettest month is May, averaging 121mm of rainfall. June and March also tend to see above-average precipitation. The driest month is August, with just 43mm. That's 78mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Kastamonu receives heavy snowfall, accumulating around 210cm annually from January through December. The snowiest month is January, with approximately 61cm. Winter travel should account for significant snow cover.

Kastamonu is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.

It is currently summer in Kastamonu, which began on June 21, 2026. Kastamonu is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 25°C, while the coldest stretch bottoms out in January near -3°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Kastamonu is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 57mm per month. By contrast, January can be quite cold with temperatures dropping to -3°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Kastamonu based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.