Hisaronu weather by month

When to go to Hisaronu

For beach weather, look at months where the daytime average clears 25°C and rainy days stay low: July, August. December is the wettest month (93 mm, about 13 rainy days) and August the driest (38 mm). The sea is warmest in August at 25.1°C and coolest in February at 7.3°C.

Getting there

A direct flight from London Gatwick to Zonguldak Çaycuma Airport (ONQ, 8 km from Filyos) takes roughly 4 h 6 min - short-haul (up to 4.5 h) by UK standards. Time-zone: Europe/Istanbul.

Records and extremes, 1991-2020

The hottest day recorded in Hisaronu between 1991 and 2020 reached 36.0°C on 13 July 2000; the coldest fell to -10.4°C on 23 March 2003. In August one day in ten tops 29.1°C and about 6% of days pass 30°C; in January one night in ten drops to -1.6°C or below. The wettest single month of the period was November 1994 with 180 mm, against a November average of 78 mm.

Spring: improving days, but a chilly sea

March is still cool rather than reliably warm, with daytime averages of 11°C and nights at 4°C. Its 13 rain days make a waterproof more useful than a suitcase built around summer clothes. April brings a clearer improvement: days reach 15°C, sunshine averages 6 hours and rain is less frequent, so flexible outdoor plans become more appealing. May is the better spring choice for gentle warmth, averaging 19°C by day and 12°C at night. Pack a layer for evenings rather than expecting warmth throughout the day. The catch is swimming: even in May the sea averages 15°C, so choose late spring for comfortable time outdoors, not for warm water.

Summer into September: the best balance for warmth and swimming

June offers a useful middle ground, with days averaging 23°C, nights at 16°C and sea temperatures of 21°C. July turns warmer and brighter, reaching 26°C by day with 11 hours of sunshine, so shade and a break from the midday sun make sense. August has similarly warm days, the warmest sea at 25°C and the fewest rain days, making it the strongest choice if swimming matters most. Still, its 5 rain days mean dry weather is not guaranteed. September eases back to 23°C by day, with the sea also at 23°C. That makes it a better swimming prospect than May, although 8 rain days call for more flexibility.

Autumn and winter: layers replace beachwear

October still offers mild afternoons, averaging 19°C by day and 13°C at night, but 10 rain days and 5 hours of sunshine make it less dependable for a holiday centred on sunbathing. The sea averages 19°C, so swimming is more a matter of personal tolerance. November slips to 15°C by day and 8°C at night; bring warmer evening clothes and keep outdoor plans flexible. December feels wintry at 10°C by day, with 13 rain days. January is the coolest month, averaging 8°C by day and 2°C at night. February improves only slightly to 9°C, while nights remain at 2°C. These months suit travellers comfortable with cool, changeable weather rather than those seeking reliable warmth.