The weather in Ios is typically Mediterranean-Cycladic, characterized by warm, sunny summers and mild, wet winters.
Summer (June - August): Temperatures usually range between 25°C and over 30°C. During July and August, the meltemia (strong northern winds) blow frequently, offering a refreshing breeze and ideal conditions for windsurfing, though they can occasionally make the sea choppy.
Autumn (September - November): The weather remains warm and suitable for swimming (especially in September), with the first notable rainfalls starting around November.
Winter (December - February): Winters are mild, with temperatures rarely dropping below 10°C. This season is characterized by high humidity, frequent rain, and strong winds.
Spring (March - May): The island turns green, and the weather steadily improves. By May, it feels quite summery, providing perfect conditions for hiking and exploring.